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Crystal Class |
Thrigonal |
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Space group |
R3c |
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Lattice constant |
a=4,994A
c=17,081A
v=368,8 A3 |
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Cleavage |
Excellent following (1011) |
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Molecular Weight |
100,09 |
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Density |
2,711 g/cm3 at 289 K |
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Reflection Loss |
for two surfaces
at 0.22 µm for o-ray - 16.9%; for e-ray – 9.2%;
at 0.71 µm for o-ray – 11.7%; for e-ray – 7.4%;
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Decomposition Temperature |
1167 K |
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Melting Temperature |
1612 K at 10,3 MPa |
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Moh,s hardness scale |
3 |
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Thermal Expansion |
Parallel 25.1 x 10-6 1/K at 323 K
Perpendicular 4,9 x 10-6 1/K at 323 K |
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Transmission Range |
0,2-2,5 µm |
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Elastic Constant |
c11 13,17 x10 Din/cm
c12 4,82 x10 Din/cm
c13 5,68 x10 Din/cm
c14 -2,0 x10 Din/cm
c22 8,11 x10 Din/cm
c44 3,5 x10 Din/cm |
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Solubility in water |
0,0014 g/l at 298 K | |
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