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Neodymium
Neodymium (Nd, atomic number 60) is a light lanthanide — soft, silvery-white, double-HCP — with a melting point of 1,021 °C and a 4f⁴6s² configuration that gives it the large magnetic moment and strong magnetocrystalline anisotropy required for Nd₂Fe₁₄B permanent magnets, the highest-energy-product magnet material known (up to ~60 MGOe / 477 kJ/m³). It has seven natural isotopes; ¹⁴²Nd is the most abundant (27.2%). Nd is one of the most abundant rare-earth elements (~38 ppm crustal), extracted from bastnäsite and monazite, with production dominated by China.
NdFeB sintered magnets dominate every application where maximum force in minimum volume is required: EV traction motors (~1–3 kg Nd each), direct-drive wind turbine generators (~200–300 kg Nd/MW), hard disk drive actuators, and industrial servo drives. Above ~80 °C, coercivity degrades; grain boundary diffusion of DyFe or TbFe into pre-sintered magnets restores it while minimising heavy-REE content. Global Nd demand for magnets exceeds 30,000 t/yr and is growing with EV adoption.
Nd:YAG (1,064 nm, ⁴F₃/₂→⁴I₁₁/₂) is the most widely deployed solid-state laser medium globally, used in industrial cutting and welding, ophthalmic surgery, rangefinders, and LIDAR; Nd:glass delivers the highest peak energies of any solid-state laser and drives inertial confinement fusion facilities (NIF, LMJ). Nd³⁺ 4f absorption bands also impart a violet-rose colour to glass, used in decorative glassware and didymium safety filters for glassblowing.
General Properties
| Property | Value | Notes |
|---|---|---|
| Atomic Number | 60 | 4f⁴6s²; +3 dominant in all practical applications. Nd²⁺ is extremely rare. ¹⁴³Nd and ¹⁴⁵Nd are NMR-active (I = 7/2). |
| Atomic Mass | 144.242 u | Seven natural isotopes: ¹⁴²Nd (27.15%), ¹⁴³Nd (12.17%), ¹⁴⁴Nd (23.80%, Stable*: alpha, t½ = 2.29 × 10¹⁵ yr), ¹⁴⁵Nd (8.30%), ¹⁴⁶Nd (17.19%), ¹⁴⁸Nd (5.76%), ¹⁵⁰Nd (5.64%, Stable*: 2νββ, t½ = 9.2 × 10¹⁸ yr). ¹⁴³Nd/¹⁴⁴Nd is the key ratio in the Sm-Nd geochronological system. |
| Density (20 °C) | 7.007 g/cm³ | Moderate for a light lanthanide. Sintered Nd₂Fe₁₄B magnets are slightly denser (~7.5 g/cm³), relevant to rotor mass calculations in motor design. |
| Melting Point | 1,021 °C (1,294 K) | Nd oxidises rapidly in air above ~150 °C; all processing requires Ar or vacuum. Produced by Ca-reduction of NdF₃. |
| Boiling Point | 3,074 °C | Nd evaporation must be controlled during Nd₂Fe₁₄B strip-casting to maintain stoichiometry. |
| Thermal Conductivity | 11.7 W/m·K | Low conductivity typical of light lanthanides. Thermal lensing in Nd:YAG rods under high average power is the primary beam-quality limitation. |
| Electrical Resistivity | 95 nΩ·m (20 °C) | High resistivity typical of lanthanides; not relevant to most Nd applications. |
| Crystal Structure | α-Nd: double HCP (dHCP), a = 3.658 Å, c = 11.799 Å | dHCP at RT; transforms to BCC above ~863 °C. Shared with La and Pr among the early lanthanides. |
Mechanical Properties
| Property | Value | Notes |
|---|---|---|
| Tensile Strength | ~200 MPa | Soft and ductile; not used structurally. Relevant to Nd foil and rod fabrication for sputtering targets and alloy precursor preparation. |
| Young's Modulus | 51 GPa | Low-moderate. Used in Nd:YAG thermal stress modelling and Nd₂Fe₁₄B magnet mechanical behaviour under press-fit motor assembly. |
| Hardness | ~35–40 HB (annealed) | Soft; comparable to mild steel in cutting resistance. Nd chips and turnings are flammable and require inert-atmosphere handling. |
| Elongation at Break | ~20% | Good ductility in high-purity annealed form. Nd foil (99.9%+) is used as sputtering target for Nd-doped oxide and NdFeB thin-film deposition. |
| Poisson's Ratio | 0.28 | Typical for a light lanthanide. |
Chemical Properties
| Property | Value / Behavior | Notes |
|---|---|---|
| Oxidation States | +3 dominant (Nd³⁺: NdCl₃, Nd₂O₃, Nd(NO₃)₃); +2 extremely rare | Nd³⁺ (4f³, ⁴I₉/₂ ground state) follows standard trivalent lanthanide chemistry. Sharp 4f-4f absorptions at ~580 nm and ~740 nm give Nd-doped glass its characteristic violet-rose colour, used in decorative crystal and didymium glassblower's filters. |
| Corrosion Resistance | Oxidises slowly in dry air; reacts with moist air and water; dissolves in dilute acids | More stable than La or Ce but should be stored under inert atmosphere. NdFeB magnets are highly corrosion-susceptible and require protective coatings (Ni, NiCuNi, epoxy, Al PVD) in all commercial applications. |
| Surface Oxide | Nd₂O₃ (hexagonal A-type) forms in air | Nd₂O₃ is the precursor for Nd:YAG crystal growth and NdFeB alloy melting. Absorbs moisture and CO₂; requires calcination before use. |
| Identifier | Value |
|---|---|
| Symbol | Nd |
| Atomic Number | 60 |
| CAS Number | 7440-00-8 |
| UN Number | UN3089 (powder) |
| EINECS Number | 231-109-3 |
| Isotope | Type | Notes |
|---|---|---|
| ¹⁴²Nd | Stable | 27.15%; I = 0. Most abundant isotope; normalisation reference in Sm-Nd measurements. ¹⁴²Nd/¹⁴⁴Nd variations in ancient rocks record early-Earth differentiation via extinct ¹⁴²Sm (t½ = 103 Myr). |
| ¹⁴³Nd | Stable | 12.17%; I = 7/2, NMR-active. Radiogenic daughter of ¹⁴⁷Sm (t½ = 1.06 × 10¹¹ yr); ¹⁴³Nd/¹⁴⁴Nd (ε_Nd) distinguishes depleted mantle from crustal sources and is the basis of Sm-Nd geochronology. |
| ¹⁴⁴Nd | Stable* | 23.80%; I = 0. Alpha decay to ¹⁴⁰Ce, t½ = 2.29 × 10¹⁵ yr. Used as the normalisation denominator in ¹⁴³Nd/¹⁴⁴Nd geochronology; its alpha decay is negligible at natural concentrations over geological time. |
| ¹⁴⁵Nd | Stable | 8.30%; I = 7/2, NMR-active. Used alongside ¹⁴³Nd NMR for cross-validation of Nd³⁺ site assignments in laser crystals and optical glasses. σ(thermal) = 42 barn. |
| ¹⁴⁶Nd | Stable | 17.19%; I = 0. Reference isotope in Nd ratio measurements and IDMS quantification of Nd in geological samples and magnet recycling streams. |
| ¹⁴⁸Nd | Stable | 5.76%; I = 0. Used as an enriched IDMS spike for high-precision Nd concentration measurements. ¹⁴⁸Nd fission yield is used in nuclear forensics to monitor cumulative fission product inventories. |
| ¹⁵⁰Nd | Stable* | 5.64%; I = 0. 2νββ to ¹⁵⁰Sm measured, t½ = 9.2 × 10¹⁸ yr. High Q-value (3.37 MeV) places the 0νββ signal above most natural γ backgrounds; enriched ¹⁵⁰Nd is a candidate source isotope for next-generation neutrinoless double-beta decay searches (SNO+) probing Majorana neutrino mass. |
Scientific & Research Applications
| Use Case | Form Typically Used | Description |
|---|---|---|
| Nd:YAG & Nd:Glass Lasers | Nd:YAG single crystals (0.6–1.4 at% Nd); Nd:phosphate glass rods and discs | Nd:YAG (1,064 nm) is the workhorse solid-state laser medium. Research covers mode-locking, Q-switching, diode pumping, and intracavity SHG/THG. Nd:glass delivers the highest pulse energies of any solid-state laser, used in inertial confinement fusion drivers (NIF, LMJ). |
| NdFeB Magnet Research | Nd metal (99.9%+); strip-cast NdFeB alloy; NdFeB thin films by sputtering | Research addresses Dy/Tb grain boundary diffusion for high-temperature coercivity, hot-deformation texturing for anisotropic bonded magnets, Nd-lean compositions to reduce cost, and end-of-life EV/wind turbine magnet recycling. |
| Sm-Nd Geochronology | ¹⁴³Nd/¹⁴⁴Nd ratio by TIMS or MC-ICP-MS | ¹⁴⁷Sm→¹⁴³Nd (t½ = 1.06 × 10¹¹ yr) dates mantle-derived igneous rocks and traces crustal growth. The ε_Nd parameter distinguishes depleted-mantle from crustal sources and is a standard tool in igneous petrology. |
| ¹⁵⁰Nd 0νββ Decay Search | Enriched ¹⁵⁰Nd (as Nd₂O₃ or NdF₃) in bolometric arrays or liquid scintillator | ¹⁵⁰Nd's high Q-value (3.37 MeV) places the 0νββ signal above most natural γ backgrounds. Used in SNO+ and studied for next-generation bolometric searches to test whether neutrinos are Majorana particles. |
Industrial & Commercial Applications
| Sector | Form / Grade Used | Description |
|---|---|---|
| NdFeB Permanent Magnets | Nd metal (29–32 wt% in Nd₂Fe₁₄B alloy, 99%+); sintered and bonded magnet grades | Nd₂Fe₁₄B sintered magnets (up to ~60 MGOe) are used in EV traction motors, wind turbine generators, hard disk drive actuators, and industrial servo motors. Each EV motor contains ~1–3 kg Nd; global magnet demand exceeds 30,000 t Nd/yr, with ~85% of production in China. |
| Nd:YAG Industrial & Medical Lasers | Nd:YAG crystals (99.9%+ Nd₂O₃ precursor); lamp- and diode-pumped systems | Industrial Nd:YAG lasers cut, weld, mark, and drill metals and ceramics. Medical uses include ophthalmic capsulotomy and dermatology. Frequency-doubled Nd:YAG (532 nm) is used in ophthalmology and green laser systems. |
| Glass Colorant & Didymium Filters | Nd₂O₃ (0.5–5 wt%) in optical and decorative glass batches | Nd₂O₃ imparts violet-rose colour via sharp 4f-4f absorptions at ~580 nm and ~740 nm. Used in decorative crystal glassware and didymium glass (Nd + Pr oxide) for glassblower's goggles and sodium flare suppression. |
| Purity | Applications | Notes |
|---|---|---|
| 99% (2N) | Magnet alloys, glass coloring, and general research. | Standard grade for industrial and laboratory applications. |
| 99.9% (3N) | Laser materials, high-performance magnets, and precision optics. | High-purity grade for advanced scientific and technical needs. |
| Synonym / Alternative Name | Context |
|---|---|
| Nd | Chemical symbol; from Greek neos didymos (new twin), named by Carl Auer von Welsbach in 1885. Standard designation in NdFeB magnet alloy specs, Nd:YAG laser datasheets, and ICP-MS REE databases. |
| Nd metal | Commercial form designation for ingot, rod, foil, or powder. Used in NdFeB strip-casting procurement and sputtering target specifications. |
| Nd element | Scientific designation distinguishing elemental Nd from Nd compounds; used in crystal structure and Sm-Nd geochronology literature. |
| Neodymium metal | Full commercial designation in REACH/RoHS documentation and ASTM REE metal standards. |
| Neodymium element | Used in academic databases, ¹⁵⁰Nd 0νββ decay literature, and ε_Nd crustal evolution geochemistry texts. |
| Neodymium rare earth metal | Trade designation; Nd is classified as highly critical on EU and US critical materials lists due to non-substitutability in high-performance magnets and concentrated supply in China. |
| Neodymium rare earth element | Geochemical designation in REE deposit assessments, Sm-Nd publications, and chondrite-normalised REE pattern databases. |
| Element 60 | Periodic table designation used in XRF/ICP-MS software, nuclear data libraries, and fission product inventory codes tracking Nd isotopes as neutron poisons in reactor fuel burnup. |