Neodymium

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Neodymium
60Nd
-

Nd

U
praseodymiumneodymiumpromethium
Ìhànsójú
silvery white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà neodymium, Nd, 60
Ẹ̀ka ẹ́límẹ̀nti lanthanide
Ẹgbẹ́, àsìkò, àdìpò n/a6, f
Ìwúwo átọ́mù 144.242
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f4 6s2
2, 8, 18, 22, 8, 2
Physical properties
Phase solid
Density (near r.t.) 7.01 g·cm−3
Liquid density at m.p. 6.89 g·cm−3
Melting point 1297 K, 1024 °C, 1875 °F
Boiling point 3347 K, 3074 °C, 5565 °F
Heat of fusion 7.14 kJ·mol−1
Heat of vaporization 289 kJ·mol−1
Molar heat capacity 27.45 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1595 1774 1998 (2296) (2715) (3336)
Atomic properties
Oxidation states 3, 2 (mildly basic oxide)
Electronegativity 1.14 (Pauling scale)
Ionization energies 1st: 533.1 kJ·mol−1
2nd: 1040 kJ·mol−1
3rd: 2130 kJ·mol−1
Atomic radius 181 pm
Covalent radius 201±6 pm
Miscellanea
Crystal structure hexagonal
Neodymium has a hexagonal crystal structure
Magnetic ordering paramagnetic, antiferromagnetic below 20K [1]
Electrical resistivity (r.t.) (α, poly) 643 nΩ·m
Thermal conductivity 16.5 W·m−1·K−1
Thermal expansion (r.t.) (α, poly) 9.6 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2330 m·s−1
Young's modulus (α form) 41.4 GPa
Shear modulus (α form) 16.3 GPa
Bulk modulus (α form) 31.8 GPa
Poisson ratio (α form) 0.281
Vickers hardness 343 MPa
Brinell hardness 265 MPa
CAS registry number 7440-00-8
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù neodymium
iso NA half-life DM DE (MeV) DP
142Nd 27.2% 142Nd is stable with 82 neutrons
143Nd 12.2% 143Nd is stable with 83 neutrons
144Nd 23.8% 2.29×1015y α 1.905 140Ce
145Nd 8.3% 145Nd is stable with 85 neutrons
146Nd 17.2% 146Nd is stable with 86 neutrons
148Nd 5.7% 148Nd is stable with 88 neutrons
150Nd 5.6% 6.7×1018y ββ 3.367 150Sm
· r

Neodymium (pípè /ˌniː.ɵˈdɪmiəm/ NEE-o-DIM-ee-əm) je apilese kemika to ni ami-idamo Nd ati nomba atomu 60.


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Gschneidner, K.A., and Eyring, L., Handbook on the Physics and Chemistry of Rare Earths, North Holland Publishing Co., Amsterdam, 1978.