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Properties of substance:
samarium
Group of substances:
inorganic
Physical appearance:
trigonal metal
Empirical formula (Hill's system for organic substances):
Sm
Structural formula as text:
Sm
Molar/atomic mass: 150.4
Melting point (°C):
1072
Boiling point (°C):
1670
Solubility (g/100 g of solvent):
mercury
: 0.095 (20°C) [
Ref.
]
Numerical data:
Year of discovery: 1879
Density:
7.54 (20°C, g/cm
3
)
Half-life:
129
62
Sm = 550 ms (β
+
(100%), β
+
p (?))
131
62
Sm = 1.2 s (β
+
(100%), β
+
p (?))
132
62
Sm = 4.0 s (β
+
(100%), β
+
p (?))
133
62
Sm = 2.89 s (β
+
(100%), β
+
p (?))
133m
62
Sm = 3.5 s ()
134
62
Sm = 9.5 s (β
+
(100%))
135
62
Sm = 10.3 s (β
+
(100%), β
+
p (0.02%))
135m
62
Sm = 2.4 s (β
+
(100%))
136
62
Sm = 47 s (β
+
(100%))
136m
62
Sm = 15 μs (internal transition (100%))
137
62
Sm = 45 s (β
+
(100%))
138
62
Sm = 3.1 min (β
+
(100%))
139
62
Sm = 2.57 min (β
+
(100%))
139m
62
Sm = 10.7 s (internal transition (100%))
140
62
Sm = 14.82 min (β
+
(100%))
141
62
Sm = 10.2 min (β
+
(100%))
141m
62
Sm = 22.6 min (β
+
(about 100%), internal transition (0.31%))
142
62
Sm = 72.49 min (β
+
(100%))
142m
62
Sm = 170 ns (internal transition (100%))
142n
62
Sm = 480 ns (internal transition (100%))
143
62
Sm = 8.75 min (β
+
(100%))
143m
62
Sm = 66 s (internal transition (about 100%), β
+
(0.24%))
143n
62
Sm = 30 ms (internal transition (100%))
144
62
Sm = stable ( (isotopic abundance 3,07%))
144m
62
Sm = 880 ns (internal transition (100%))
145
62
Sm = 340 d (electron capture (100%))
145m
62
Sm = 990 ns (internal transition (100%))
146
62
Sm = 68 000 000 y (α (100%))
147
62
Sm = 106 600 000 000 y (α (100%) (isotopic abundance 14,99%))
148
62
Sm = 6.3 · 10
15
y (α (100%) (isotopic abundance 11,24%))
149
62
Sm = stable ( (isotopic abundance 13,82%))
150
62
Sm = stable ( (isotopic abundance 7,38%))
151
62
Sm = 90 y (β
-
(100%))
151m
62
Sm = 1.4 μs (internal transition (100%))
152
62
Sm = stable ( (isotopic abundance 26,75%))
153
62
Sm = 46.284 h (β
-
(100%))
153m
62
Sm = 10.6 ms (internal transition (100%))
154
62
Sm = stable ( (isotopic abundance 22,75%))
155
62
Sm = 22.3 min (β
-
(100%))
155m
62
Sm = 2.8 μs (internal transition (100%))
155n
62
Sm = 1.00 μs (internal transition (100%))
156
62
Sm = 9.4 h (β
-
(100%))
156m
62
Sm = 185 ns (internal transition (100%))
157
62
Sm = 8.03 min (β
-
(100%))
158
62
Sm = 5.30 min (β
-
(100%))
158m
62
Sm = 115 ns (internal transition (100%))
159
62
Sm = 11.37 s (β
-
(100%))
159m
62
Sm = 116 ns (internal transition (100%))
160
62
Sm = 9.6 s (β
-
(100%))
160m
62
Sm = 120 ns (internal transition (100%))
160n
62
Sm = 1.8 μs (internal transition (100%))
161
62
Sm = 4.8 s (β
-
(100%))
162
62
Sm = 2.7 s (β
-
(100%))
163
62
Sm = 1.3 s (β
-
(100%))
164
62
Sm = 1.43 s (β
-
(100%), β
-
n)
165
62
Sm = 980 ms (β
-
(100%), β
-
n)
166
62
Sm = 800 ms (β
-
(100%))
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)):
68.2 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
27.2 (s)
References:
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 263 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 94 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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