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Properties of substance:
neodymium
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
Nd
Structural formula as text:
Nd
Molar/atomic mass: 144.24
Melting point (°C):
1024
Boiling point (°C):
3080
Solubility (g/100 g of solvent):
mercury
: 0.014 (20°C) [
Ref.
]
water
: reaction [
Ref.
]
Numerical data:
Year of discovery: 1885
Density:
7.01 (20°C, g/cm
3
)
Half-life:
125
60
Nd = 650 ms (β
+
(100%), β
+
p)
127
60
Nd = 1.8 s (β
+
(100%), β
+
p (?))
129
60
Nd = 6.8 s (β
+
(100%), β
+
p (?))
129m
60
Nd = 2.6 s (β
+
(100%), β
+
p (?))
130
60
Nd = 21 s (β
+
(100%))
131
60
Nd = 25.4 s (β
+
(100%), β
+
p (?))
132
60
Nd = 1.56 min (β
+
(100%))
133
60
Nd = 70 s (β
+
(100%))
133m
60
Nd = 70 s (β
+
(about 100%))
133n
60
Nd = 301 ns (internal transition (100%))
134
60
Nd = 8.5 min (β
+
(100%))
134m
60
Nd = 410 μs (internal transition (100%))
135
60
Nd = 12.4 min (β
+
(100%))
135m
60
Nd = 5.5 min (β
+
(> 99.7%), internal transition)
136
60
Nd = 50.7 min (β
+
(100%))
137
60
Nd = 38.5 min (β
+
(100%))
137m
60
Nd = 1.60 s (internal transition (100%))
138
60
Nd = 5.04 h (β
+
(100%))
138m
60
Nd = 370 ns (internal transition (100%))
139
60
Nd = 29.7 min (β
+
(100%))
139m
60
Nd = 5.50 h (β
+
(88.2%), internal transition (11.8%))
139n
60
Nd = 276.8 ns ()
140
60
Nd = 3.37 d (electron capture (100%))
140m
60
Nd = 600 μs (internal transition (100%))
140n
60
Nd = 1.22 μs (internal transition (100%))
141
60
Nd = 2.49 h (β
+
(100%))
141m
60
Nd = 62.0 s (internal transition (about 100%), β
+
(0.032%))
142
60
Nd = stable ( (isotopic abundance 27,152%))
142m
60
Nd = 16.5 μs (internal transition (100%))
143
60
Nd = stable ( (isotopic abundance 12,174%))
144
60
Nd = 2.29 · 10
15
y (α (100%) (isotopic abundance 23,798%))
145
60
Nd = stable ( (isotopic abundance 8,293%))
146
60
Nd = stable ( (isotopic abundance 17,189%))
147
60
Nd = 10.98 d (β
-
(100%))
148
60
Nd = stable ( (isotopic abundance 5,756%))
149
60
Nd = 1.728 h (β
-
(100%))
150
60
Nd = 8.2 · 10
18
y (2β
-
(100%) (isotopic abundance 5,638%))
151
60
Nd = 12.44 min (β
-
(100%))
152
60
Nd = 11.4 min (β
-
(100%))
153
60
Nd = 31.6 s (β
-
(100%))
153m
60
Nd = 1.10 μs (internal transition (100%))
154
60
Nd = 25.9 s (β
-
(100%))
154m
60
Nd = 3.2 μs (internal transition (100%))
155
60
Nd = 8.9 s (β
-
(100%))
156
60
Nd = 5.06 s (β
-
(100%))
157
60
Nd = 1.15 s (β
-
(100%))
158
60
Nd = 810 ms (β
-
(100%))
159
60
Nd = 500 ms (β
-
(100%), β
-
n)
160
60
Nd = 439 ms (β
-
(100%), β
-
n)
161
60
Nd = 215 ms (β
-
(100%), β
-
n)
162
60
Nd = 310 ms (β
-
(100%))
Vapour pressure (Torr):
0.01 (1345°C)
0.1 (1535°C)
1 (1776°C)
10 (2090°C)
100 (2530°C)
Electrode potential:
Nd
3+
+ 3e
-
→ Nd, E = -2.32 V (water, 25°C)
Nd
4+
+ e
-
→ Nd
3+
, E = 4.9 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
0 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
0 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
70.92 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
27.4 (s)
References:
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 170-171 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 86 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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