Page 23 - Academic Press Encyclopedia of Physical Science and Technology 3rd InOrganic Chemistry

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Encyclopedia of Physical Science and Technology EN001F-11 May 7, 2001 12:19

Actinide Elements 231

TABLE XII Binary Actinide Halides
Lattice parameters
Compound Color Symmetry a ( ˚ A) b ( ˚ A) c ( ˚ A) α (deg) β (deg) γ (deg)
β-ThI 2 Gold Hexagonal 3.97 31.75
AmI 2 Black Monoclinic 7.677 8.311 7.925 98.5
α-CfI 2 Violet Hexagonal 4.557 6.992
β-CfI 2 Violet Rhombohedral 7.434 35.8
AmBr 2 Black Trigonal 11.59 7.121
CfBr 2 Amber Trigonal 11.000 7.109
AmCl 2 Black Orthorhombic 8.963 7.573 4.532
PaI 3 Black Orthorhombic 4.33 14.00 10.02
UI 3 Black Orthorhombic 4.328 13.996 9.984
NpI 3 Purple Orthorhombic 4.3 14.03 9.95
PuI 3 Green Orthorhombic 4.33 13.95 9.96
α-AmI 3 Yellow Orthorhombic 4.31 14.03 9.92
Yellow Hexagonal 7.42 20.55
β-AmI 3
CmI 3 White Hexagonal 7.44 20.4
BkI 3 Yellow Hexagonal 7.84 20.87
CfI 3 Yellow Hexagonal 7.587 20.814
EsI 3 Red Hexagonal 7.53 20.84
AcBr 3 Hexagonal 8.06 4.68
UBr 3 Red Hexagonal 7.936 4.438
α-NpBr 3 Green Hexagonal 7.919 4.392
β-NpBr 3 Green Orthorhombic 12.618 4.109 9.153
PuBr 3 Green Orthorhombic 12.65 4.10 9.15
AmBr 3 White Orthorhombic 12.66 4.064 9.144
CmBr 3 White Orthorhombic 12.70 4.041 9.135
BkBr 3 Yellow-green Monoclinic 7.23 12.53 6.83 110.6
α-CfBr 3 Pale green Monoclinic 7.215 12.423 6.825 110.7
β-CfBr 3 Pale green Rhombohedral 7.58 56.2
EsBr 3 Straw Monoclinic 7.27 12.59 6.81 110.8
AcCl 3 White Hexagonal 7.62 4.55
UCl 3 Green Hexagonal 7.442 4.320
NpCl 3 Green Hexagonal 7.413 4.282
PuCl 3 Green Hexagonal 7.395 4.246
AmCl 3 Pink Hexagonal 7.382 4.214
CmCl 3 White Hexagonal 7.374 4.185
BkCl 3 Green Hexagonal 7.382 4.127
β-CfCl 3 Green Hexagonal 7.379 4.090
α-CfCl 3 Green Orthorhombic 3.859 11.748 8.561
EsCl 3 Hexagonal 7.40 4.07
AcF 3 White Trigonal 7.41 7.53
UF 3 Black Trigonal 7.181 7.348
NpF 3 Purple Trigonal 7.129 7.288
PuF 3 Violet Trigonal 7.092 7.254
AmF 3 Pink Hexagonal 7.044 7.225
CmF 3 White Trigonal 7.019 7.198
β-BkF 3 Yellow-green Trigonal 6.97 7.14
α-BkF 3 Yellow-green Orthorhombic 6.70 7.09 4.41
α-CfF 3 Light green Orthorhombic 6.653 7.039 4.393
β-CfF 3 Light green Trigonal 6.945 7.101
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