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Neodymium

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Neodymium is a chemical element; it has symbol Nd and atomic number 60. It is the fourth member of the lanthanide series and is considered to be one of the rare-earth metals. It is a hard, slightly malleable, silvery metal that quickly in air and moisture. When oxidized, neodymium reacts quickly producing pink, purple/blue and yellow compounds in the +2, +3 and +4 . It is generally regarded as having one of the most complex spectra of the elements. Neodymium was discovered in 1885 by the Austrian chemist Carl Auer von Welsbach, who also discovered praseodymium. Neodymium is present in significant quantities in the minerals monazite and bastnäsite. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Neodymium is fairly common—about as common as cobalt, nickel, or copper—and is widely distributed in the Earth's crust.See Abundances of the elements (data page). Most of the world's commercial neodymium is mining in China, as is the case with many other rare-earth metals.

Neodymium compounds were first commercially used as glass dyes in 1927 and remain a popular additive. The color of neodymium compounds comes from the Nd³⁺ ion and is often a reddish-purple. This color changes with the type of lighting because of the interaction of the sharp light absorption bands of neodymium with ambient light enriched with the sharp visible emission bands of mercury, trivalent europium or terbium. Glasses that have been Dopant with neodymium are used in lasers that emit infrared with wavelengths between 1047 and 1062 nanometers. These lasers have been used in extremely high-power applications, such as in inertial confinement fusion. Neodymium is also used with various other substrate crystals, such as yttrium aluminium garnet in the .

Neodymium alloys are used to make high-strength , which are powerful permanent magnets. These magnets are widely used in products like microphones, professional loudspeakers, in-ear headphones, high-performance hobby DC electric motors, and computer hard disks, where low magnet mass (or volume) or strong magnetic fields are required. Larger neodymium magnets are used in with a high power-to-weight ratio (e.g., in hybrid cars) and generators (e.g., aircraft and wind turbine electric generators).Gorman, Steve (August 31, 2009) As hybrid cars gobble rare metals, shortage looms, Reuters.

Physical properties

Metallic neodymium has a bright, silvery metallic luster. Neodymium commonly exists in two Allotropy forms, with a transformation from a double hexagonal to a body-centered cubic structure taking place at about 863 °C.

(2025). 9781498754293, CRC Press. ISBN 9781498754293

Neodymium, like most of the lanthanides, is paramagnetic at room temperature. It becomes an antiferromagnet upon cooling below .

(1994). 9780849342615, CRC Press. . ISBN 9780849342615

Below this transition temperature it exhibits a set of complex magnetic phases that have long spin relaxation times and spin glass behavior. Neodymium is a rare-earth metal that was present in the classical mischmetal at a concentration of about 18%. To make neodymium magnets it is alloyed with iron, which is a ferromagnet.

Electron configuration

Neodymium is the fourth member of the lanthanide series. In the periodic table, it appears between the lanthanides praseodymium to its left and the radioactive element promethium to its right, and above the actinide uranium. Its 60 electrons are arranged in the configuration Xe4f⁴6s², of which the six 4f and 6s electrons are valence electron. Like most other metals in the lanthanide series, neodymium usually only uses three electrons as valence electrons, as afterwards the remaining 4f electrons are strongly bound: this is because the 4f orbitals penetrate the most through the inert xenon core of electrons to the nucleus, followed by 5d and 6s, and this increases with higher ionic charge. Neodymium can still lose a fourth electron because it comes early in the lanthanides, where the nuclear charge is still low enough and the 4f subshell energy high enough to allow the removal of further valence electrons.

Chemical properties

Neodymium has a melting point of and a boiling point of . Like other lanthanides, it usually has the oxidation state +3, but can also form in the +2 and +4 oxidation states, and even, in very rare conditions, +0. Neodymium metal quickly Redox at ambient conditions, forming an oxide layer like iron rust that can Spallation off and expose the metal to further oxidation; a centimeter-sized sample of neodymium corrodes completely in about a year. Nd³⁺ is generally soluble in water. Like its neighbor praseodymium, it readily burns at about 150 °C to form neodymium(III) oxide; the oxide then peels off, exposing the bulk metal to the further oxidation:

Neodymium is an electropositive element, and it reacts slowly with cold water, or quickly with hot water, to form neodymium(III) hydroxide:

Neodymium metal reacts vigorously with all the stable : Neodymium: reactions of elements . WebElements. 2017-4-10

Neodymium dissolves readily in dilute sulfuric acid to form solutions that contain the lilac Nd(III) ion. These exist as a Nd(OH₂)₉³⁺ complexes:

Compounds

Some of the most important neodymium compounds include:

halides: NdF₃; NdCl₂; NdCl₃; NdBr₃; NdI₂; NdI₃
oxides:
hydroxide:
carbonate: Nd₂(CO₃)₃
sulfate:
acetate: Nd(CH₃COO)₃
(Nd₂Fe₁₄B)

Some neodymium compounds vary in color under different types of lighting.

(1996). 9789401065207 ISBN 9789401065207

File:Neodymium tl1.jpg|Neodymium compounds in Fluorescent lamp light—from left to right, the sulfate, nitrate, and chloride File:Neodymium fluorescent1.jpg|Neodymium compounds in compact fluorescent lamp light File:Neodymium daylight1.jpg|Neodymium compounds in normal daylight

Organoneodymium compounds

Organoneodymium compounds are compounds that have a neodymium–carbon bond. These compounds are similar to those of the other lanthanides, characterized by an inability to undergo pi backbonding. They are thus mostly restricted to the mostly ionic cyclopentadienides (isostructural with those of lanthanum) and the σ-bonded simple alkyls and aryls, some of which may be .

Isotopes

Naturally occurring neodymium (₆₀Nd) is composed of five stable —¹⁴²Nd, ¹⁴³Nd, ¹⁴⁵Nd, ¹⁴⁶Nd and ¹⁴⁸Nd, with ¹⁴²Nd being the most abundant (27.2% of the natural abundance)—and two with extremely long half-lives, ¹⁴⁴Nd (alpha decay with a half-life ( t_1/2) of years) and ¹⁵⁰Nd (double beta decay, t_1/2 ≈ years). In all, 35 radioisotopes of neodymium have been detected , with the most stable radioisotopes being the naturally occurring ones: ¹⁴⁴Nd and ¹⁵⁰Nd. All of the remaining radioactive isotopes have half-lives that are shorter than twelve days, and the majority of these have half-lives that are shorter than 70 seconds; the most stable artificial isotope is ¹⁴⁷Nd with a half-life of 10.98 days.

Neodymium also has 15 known metastable isotopes, with the most stable one being ^139mNd ( t_1/2 = 5.5 hours), ^135mNd ( t_1/2 = 5.5 minutes) and ^133m1Nd ( t_1/2 ~70 seconds). The primary before the most abundant stable isotope, ¹⁴²Nd, are electron capture and positron decay, and the primary mode after is beta minus decay. The primary before ¹⁴²Nd are praseodymium isotopes, and the primary products after ¹⁴²Nd are promethium isotopes. Four of the five stable isotopes are only observationally stable, which means that they are expected to undergo radioactive decay, though with half-lives long enough to be considered stable for practical purposes. Additionally, some observationally stable isotopes of samarium are predicted to decay to isotopes of neodymium.

Neodymium isotopes are used in various scientific applications. ¹⁴²Nd has been used for the production of short-lived isotopes of thulium and ytterbium. ¹⁴⁶Nd has been suggested for the production of ¹⁴⁷Pm, which is a source of radioactive power. Several neodymium isotopes have been used for the production of other promethium isotopes. The decay from ¹⁴⁷Sm ( t_1/2 = ) to the stable ¹⁴³Nd allows for samarium–neodymium dating. ¹⁵⁰Nd has also been used to study double beta decay.

History

In 1751, the Swedish mineralogist Axel Fredrik Cronstedt discovered a heavy mineral from the mine at Bastnäs, later named cerite. Thirty years later, fifteen-year-old Wilhelm Hisinger, a member of the family owning the mine, sent a sample to Carl Scheele, who did not find any new elements within. In 1803, after Hisinger had become an ironmaster, he returned to the mineral with Jöns Jacob Berzelius and isolated a new oxide, which they named ceria after the dwarf planet Ceres, which had been discovered two years earlier. Ceria was simultaneously and independently isolated in Germany by Martin Heinrich Klaproth. Between 1839 and 1843, ceria was shown to be a mixture of oxides by the Swedish surgeon and chemist Carl Gustaf Mosander, who lived in the same house as Berzelius; he separated out two other oxides, which he named lanthana and didymia. He partially decomposed a sample of cerium nitrate by roasting it in air and then treating the resulting oxide with dilute nitric acid. The metals that formed these oxides were thus named lanthanum and didymium.See:

From p. 356: "L'oxide de cérium, extrait de la cérite par la procédé ordinaire, contient à peu près les deux cinquièmes de son poids de l'oxide du nouveau métal qui ne change que peu les propriétés du cérium, et qui s'y tient pour ainsi dire caché. Cette raison a engagé M. Mosander à donner au nouveau métal le nom de Lantane ." (The oxide of cerium, extracted from cerite by the usual procedure, contains almost two fifths of its weight in the oxide of the new metal, which differs only slightly from the properties of cerium, and which is held in it so to speak "hidden". This reason motivated Mr. Mosander to give to the new metal the name Lantane).
Didymium was later proven to not be a single element when it was split into two elements, praseodymium and neodymium, by Carl Auer von Welsbach in Vienna in 1885.
(2025). 9780203413029, CRC Press. ISBN 9780203413029
Von Welsbach confirmed the separation by spectroscopic analysis, but the products were of relatively low purity. Pure neodymium was first isolated in 1925. The name neodymium is derived from the Greek words neos (νέος), new, and didymos (διδύμος), twin.
Emsley, John (2025). 9780198503408, Oxford University Press. . ISBN 9780198503408

Double nitrate crystallization was the means of commercial neodymium purification until the 1950s. Lindsay Chemical Division was the first to commercialize large-scale ion-exchange purification of neodymium. Starting in the 1950s, high purity (>99%) neodymium was primarily obtained through an ion exchange process from monazite, a mineral rich in rare-earth elements. The metal is obtained through electrolysis of its halide salts. Currently, most neodymium is extracted from bastnäsite and purified by solvent extraction. Ion-exchange purification is used for the highest purities (typically >99.99%). Since then, the glass technology has improved due to the improved purity of commercially available neodymium oxide and the advancement of glass technology in general. Early methods of separating the lanthanides depended on fractional crystallization, which did not allow for the isolation of high-purity neodymium until the aforementioned ion exchange methods were developed after World War II.

Occurrence and production

Occurrence

Neodymium is rarely found in nature as a free element, instead occurring in ores such as monazite and bastnäsite (which are rather than single minerals) that contain small amounts of all rare-earth elements. Neodymium is rarely dominant in these minerals, with exceptions such as monazite-(Nd) and kozoite-(Nd). The main mining areas are in China, United States, Brazil, India, Sri Lanka, and Australia.

The Nd³⁺ ion is similar in size to ions of the early lanthanides of the cerium group (those from lanthanum to samarium and europium). As a result, it tends to occur along with them in phosphate, silicate and carbonate minerals, such as monazite (M^IIIPO₄) and bastnäsite (M^IIICO₃F), where M refers to all the rare-earth metals except scandium and the radioactive promethium (mostly Ce, La, and Y, with somewhat less Pr and Nd). Bastnäsite is usually lacking in thorium and the heavy lanthanides, and the purification of the light lanthanides from it is less involved than from monazite. The ore, after being crushed and ground, is first treated with hot concentrated sulfuric acid, which liberates carbon dioxide, hydrogen fluoride, and silicon tetrafluoride. The product is then dried and leached with water, leaving the early lanthanide ions, including lanthanum, in solution.

Solar System abundances ! style="text-align:center;"	Atomic number ! style="width:45%;"	Element ! style="padding-right: 5px; padding-left: 10px;"	Relative amount
42	Molybdenum	2.771
47	Silver	0.590
50	Tin	4.699
58	Cerium	1.205
59	Praseodymium	0.205
60	Neodymium	1
74	Tungsten	0.054
90	Thorium	0.054
92	Uranium	0.022

In space

Neodymium's per-particle abundance in the Solar System is 0.083 ppb (parts per billion). This figure is about two thirds of that of platinum, but two and a half times more than mercury, and nearly five times more than gold. The lanthanides are not usually found in space, and are much more abundant in the Earth's crust.A, CRC Handbook of Chemistry and Physics, 97th edition (2016–2017), p. 14-17

In the Earth's crust

Neodymium is classified as a lithophile under the Goldschmidt classification, meaning that it is generally found combined with oxygen. Although it belongs to the rare-earth metals, neodymium is not rare at all. Its abundance in the Earth's crust is about 41 mg/kg. It is similar in abundance to lanthanum.

Production

The world's production of neodymium was about 7,000 tons in 2004. The bulk of current production is from China. Historically, the Chinese government imposed strategic material controls on the element, causing large fluctuations in prices. The uncertainty of pricing and availability have caused companies (particularly Japanese ones) to create permanent magnets and associated electric motors with fewer rare-earth metals; however, so far they have been unable to eliminate the need for neodymium. According to the US Geological Survey, Greenland holds the largest reserves of undeveloped rare-earth deposits, particularly neodymium. Mining industry clash with native populations at those sites, due to the release of radioactive substances, mainly thorium, during the mining process.

Neodymium is typically 10–18% of the rare-earth content of commercial deposits of the light rare-earth-element minerals bastnäsite and monazite. With neodymium compounds being the most strongly colored for the trivalent lanthanides, it can occasionally dominate the coloration of rare-earth minerals when competing chromophores are absent. It usually gives a pink coloration. Outstanding examples of this include monazite crystals from the tin deposits in Llallagua, Bolivia; ancylite from Mont Saint-Hilaire, Quebec, Canada; or lanthanite from Lower Saucon Township, Pennsylvania. As with neodymium glasses, such minerals change their colors under the differing lighting conditions. The absorption bands of neodymium interact with the visible emission spectrum of mercury vapor, with the unfiltered shortwave UV light causing neodymium-containing minerals to reflect a distinctive green color. This can be observed with monazite-containing sands or bastnäsite-containing ore.

The demand for mineral resources, such as rare-earth elements (including neodymium) and other critical materials, has been rapidly increasing owing to the growing human population and industrial development. Recently, the requirement for a low-carbon society has led to a significant demand for energy-saving technologies such as batteries, high-efficiency motors, renewable energy sources, and fuel cells. Among these technologies, permanent magnets are often used to fabricate high-efficiency motors, with neodymium-iron-boron magnets (Nd₂Fe₁₄B sintered and bonded magnets; hereinafter referred to as Neodymium magnet) being the main type of permanent magnet in the market since their invention. NdFeB magnets are used in hybrid electric vehicles, plug-in hybrid, , fuel cell vehicles, , , computers, and many small consumer electronic devices. Furthermore, they are indispensable for energy savings. Toward achieving the objectives of the Paris Agreement, the demand for NdFeB magnets is expected to increase significantly in the future.

Applications

Magnets

(an alloy, Nd₂Fe₁₄B) are the strongest known. A neodymium magnet of a few tens of grams can lift a thousand times its own weight, and can snap together with enough force to break bones. These magnets are cheaper, lighter, and stronger than samarium–cobalt magnets. However, they are not superior in every aspect, as neodymium-based magnets lose their magnetism at lower temperatures and tend to corrode, while samarium–cobalt magnets do not.

Neodymium magnets appear in products such as , professional , headphones, guitar and bass guitar pick-ups, and computer where low mass, small volume, or strong magnetic fields are required. Neodymium is used in the electric motors of hybrid and electric automobiles and in the electricity generators of some designs of commercial wind turbines (only wind turbines with "permanent magnet" generators use neodymium). For example, drive electric motors of each Toyota Prius require of neodymium per vehicle. Neodymium magnets are also widely used in pure electric vehicle motors, driving rapid growth in demand. Neodymium magnets are used in medical devices such as MRI and treatments for chronic pain and wound healing.

Glass

Neodymium glass (Nd:glass) is produced by the inclusion of neodymium oxide (Nd₂O₃) in the glass melt. In daylight or incandescent light neodymium glass appears lavender, but it appears pale blue under Fluorescent lamp lighting. Neodymium may be used to color glass in shades ranging from pure violet through wine-red and warm gray.

The first commercial use of purified neodymium was in glass coloration, starting with experiments by Leo Moser in November 1927. The resulting "Alexandrite" glass remains a signature color of the Moser glassworks to this day. Neodymium glass was widely emulated in the early 1930s by American glasshouses, most notably Heisey, Fostoria ("wisteria"), Cambridge ("heatherbloom"), and Steuben ("wisteria"), and elsewhere (e.g. Lalique, in France, or Murano). Tiffin's "twilight" remained in production from about 1950 to 1980. Current sources include glassmakers in the Czech Republic, the United States, and China.

(1981). 9783662135167 ISBN 9783662135167

The sharp absorption bands of neodymium cause the glass color to change under different lighting conditions, being reddish-purple under daylight or yellow incandescent light, blue under white fluorescent lighting, and greenish under Trichromacy lighting. In combination with gold or selenium, red colors are produced. Since neodymium coloration depends upon "forbidden" f-f transitions deep within the atom, there is relatively little influence on the color from the chemical environment, so the color is impervious to the thermal history of the glass. However, for the best color, iron-containing impurities need to be minimized in the silica used to make the glass. The same forbidden nature of the f-f transitions makes rare-earth colorants less intense than those provided by most d-transition elements, so more has to be used in a glass to achieve the desired color intensity. The original Moser recipe used about 5% of neodymium oxide in the glass melt, a sufficient quantity such that Moser referred to these as being "rare-earth doped" glasses. Being a strong base, that level of neodymium would have affected the melting properties of the glass, and the Calcium oxide content of the glass might have needed adjustments.

Bray, Charles (2025). 081223619X, University of Pennsylvania Press. . 081223619X

Light transmitted through neodymium glasses shows unusually sharp ; the glass is used in astronomy to produce sharp bands by which may be calibrated. Another application is the creation of selective astronomical filters to reduce the effect of light pollution from sodium and fluorescent lighting while passing other colours, especially dark red hydrogen-alpha emission from nebulae. Baader Neodymium Filter, First Light Optics. Neodymium is also used to remove the green color caused by iron contaminants from glass.

Neodymium is a component of "didymium" (referring to mixture of salts of neodymium and praseodymium) used for coloring glass to make welder's and glass-blower's goggles; the sharp absorption bands obliterate the strong sodium emission at 589 nm. The similar absorption of the yellow mercury emission line at 578 nm is the principal cause of the blue color observed for neodymium glass under traditional white-fluorescent lighting. Neodymium and didymium glass are used in color-enhancing filters in indoor photography, particularly in filtering out the yellow hues from incandescent lighting. Similarly, neodymium glass is becoming widely used more directly in incandescent light bulbs. These lamps contain neodymium in the glass to filter out yellow light, resulting in a whiter light which is more like sunlight. During World War I, didymium mirrors were reportedly used to transmit Morse code across battlefields.

(2025). 9780199383344, Oxford University Press. . ISBN 9780199383344

Similar to its use in glasses, neodymium salts are used as a colorant for vitreous enamel.

Lasers

Certain transparent materials with a small concentration of neodymium ions can be used in lasers as gain medium for infrared wavelengths (1054–1064 nm), e.g. (yttrium aluminium garnet), Nd:YAP (yttrium aluminium perovskite), (yttrium lithium fluoride), (yttrium orthovanadate), and Nd:glass. Neodymium-doped crystals (typically Nd:YVO₄) generate high-powered infrared laser beams which are converted to green laser light in commercial DPSS hand-held lasers and .

Trivalent neodymium ion Nd³⁺ was the first lanthanide from rare-earth elements used for the generation of laser radiation. The Nd:CaWO₄ laser was developed in 1961. Historically, it was the third laser which was put into operation (the first was ruby, the second the U³⁺:CaF laser). Over the years the neodymium laser became one of the most used lasers for application purposes. The success of the Nd³⁺ ion lies in the structure of its energy levels and in the spectroscopic properties suitable for the generation of laser radiation. In 1964 Geusic et al. demonstrated the operation of neodymium ion in YAG matrix Y₃Al₅O₁₂. It is a four-level laser with lower threshold and with excellent mechanical and temperature properties. For optical pumping of this material it is possible to use non-coherent flashlamp radiation or a coherent diode beam.Koechner, 1999; Powell, 1998; Svelto, 1998; Siegman, 1986

The current laser at the UK Atomic Weapons Establishment (AWE), the HELEN (High Energy Laser Embodying Neodymium) 1-terawatt neodymium-glass laser, can access the midpoints of pressure and temperature regions and is used to acquire data for modeling on how density, temperature, and pressure interact inside warheads. HELEN can create plasmas of around 10⁶ Kelvin, from which opacity and transmission of radiation are measured.

Neodymium glass solid-state lasers are used in extremely high power (terawatt scale), high energy () multiple beam systems for inertial confinement fusion. Nd:glass lasers are usually nonlinear optics to the third harmonic at 351 nm in laser fusion devices.

Other

Other applications of neodymium include:

Neodymium has an unusually large specific heat capacity at liquid-helium temperatures, so is useful in cryocoolers.
Neodymium acetate can be used as a standard contrasting agent in electron microscopy (a substitute for the radioactive and toxic uranyl acetate).
Probably because of similarities to Ca²⁺, Nd³⁺ has been reported to promote plant growth. Rare-earth element compounds are frequently used in China as fertilizer.
Samarium–neodymium dating is useful for determining the age relationships of rocks and meteorites.
Neodymium isotopes recorded in marine sediments are used to reconstruct changes in past ocean circulation.

Biological role and precautions

The early lanthanides, including neodymium, as well as lanthanum, cerium and praseodymium, have been found to be essential to some methanotrophic bacteria living in Mudpot, such as Methylacidiphilum fumariolicum. Neodymium is not otherwise known to have a biological role in any other organisms.

Neodymium metal dust is combustible and therefore an explosion hazard. Neodymium compounds, as with all rare-earth metals, are of low to moderate toxicity; however, its toxicity has not been thoroughly investigated. Ingested neodymium salts are regarded as more toxic if they are soluble than if they are insoluble. Neodymium dust and salts are very irritating to the eyes and , and moderately irritating to skin. Breathing the dust can cause lung , and accumulated exposure damages the liver. Neodymium also acts as an anticoagulant, especially when given intravenously.

Neodymium magnets have been tested for medical uses such as magnetic braces and bone repair, but biocompatibility issues have prevented widespread applications. Commercially available magnets made from neodymium are exceptionally strong and can attract each other from large distances. If not handled carefully, they come together very quickly and forcefully, causing injuries. There is at least one documented case of a person losing a fingertip when two magnets he was using snapped together from 50 cm away.

Another risk of these powerful magnets is that if more than one magnet is ingested, they can pinch soft tissues in the gastrointestinal tract. This has led to an estimated 1,700 emergency room visits and necessitated the recall of the Buckyballs line of toys, which were construction sets of small neodymium magnets.

Neodymium

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Neodymium

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