|
|
| Neodymium | |
| Electron Configuration | 2,8,18,22,8,2 |
| Electron Configuration | [Xe] 4f4 6s2 |
| Ground state | 5I4 |
| Atomic Volume | 20.6 g/cm3 |
| Electronegativity | 1.14 |
| Magnetic ordering | Ferromagnetic |
| Mass magnetic susceptibility | 4.8 x 10-7 |
| Molar magnetic susceptibility | 6.9235 x 10-8 |
| Speed of sound | 2330 m s-1 |
 Thermal Properties |
|
| Enthalpy of Atomization | 322 kJ mol-1 @25°C |
| Enthalpy of Fusion | 7.11 kJ mol-1 |
| Enthalpy of Vaporisation | 328 kJ mol-1 |
| Heat Capacity | 27.45 J mol-1 K-1 |
| Thermal Conductivity | 16.5 W m-1 K-1 |
| Thermal Expansion | 9.6 μm m-1 K-1 |
| Hardness |
|
| Brinell hardness | 265 MPa |
| Vickers hardness | 343 MPa |
| Elastic Properties |
|
| Bulk modulus | 31.8 GPa |
| Poisson ratio | 0.281 |
| Shear modulus | 16.3 GPa |
| Young's modulus | 41.4 GPa |
| Electrical Properties |
|
| Electrical resistivity | 6.4 x 10-7 Ω m |
| Electrical conductivity | No data. |
| Chemical Properties |
|
| Electrochemical Equivalent | 1.7939 g Ah-1 |
| Electron Work Function | 3.2 eV |
| Valence Electron Potential (-eV) | 43.4 |
| Ionization Potential | |
 First
|
5.53 |
| Second
|
10.727 |
| Third
|
22.076 |
| Energy Levels |
|
| Kα1 (intensity 100) |
37.361 KeV |
| Kα2 (intensity 50) |
36.8474 KeV |
| Kβ1 (intensity 21.9) |
42.2713 KeV |
| Kβ2 (intensity 7.3) |
43.3204 KeV |
| Kβ3 (intensity 9.1) |
42.1568 KeV |
| Lα1 (intensity 100) |
5.2304 KeV |
| Lα2 (intensity 10) |
5.2077 KeV |
| Lβ1 (intensity 50) |
5.7216 KeV |
| Lβ2 (intensity 20) |
6.0894 KeV |
| Lβ3 (intensity 10) |
5.8288 KeV |
| Lβ4 (intensity 4) |
5.7237 KeV |
| Lγ1 (intensity 5.5) |
6.6021 KeV |
| Lγ2 (intensity 2) |
6.8802 KeV |
| Lγ3 (intensity 2) |
5.144 KeV |
| Ll (intensity 3.5) |
4.6355 KeV |
| Atomic Radii |
|
| Empirical
|
185 pm |
| Bohr Radius
|
206 pm |
| Covalent Radius
|
No data. |
| Van der Waals
|
No data. |
| Triple covalent
|
No data. |
| Metallic
|
181.4 pm |
| Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 2 | VIII | 1.43 | 1.29 | |
| IX | 1.49 | 1.35 | ||
| 3 | VI | 1.123 | 0.983 | R |
| VIII | 1.249 | 1.109 | R* | |
| IX | 1.303 | 1.163 | R | |
| XII | 1.41 | 1.27 | E | |
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
| Oxidation States |
|
| Main
|
Nd+3 |
| Other
|
Nd+2, Nd+4 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
529.6 |
| M+ - M2+ |
1035 |
| M2+ - M3+ |
2130 |
| M3+ - M4+ |
3899 |
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 1595 | 1774 | 1998 | (2296) | (2715) | (3336) |
| Crystal Structure |
|
| Structure
|
Hexagonal close packed |
 |
a = 365.8 pm |
| b = 365.8 pm | |
| c = 1179.9 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |