(Burenkov et al. [1975]).
| Bulk modulus | 5.8·1011 dyn cm-2 |
| Density | 5.68 g cm-3 |
| Hardness on the Mohs scale | 3.8 |
| Surface microhardness (using Knoop's pyramid test) | 430 kg mm-2 |
| Cleavage plane | {100} |
| Piezoelectric constant | e14= -4.5·10-2 C m-2 |
| Electron g - factor | |
298 K |
-17.5 |
80 K |
-15.4 |
|
Temperature dependences of elastic constants. (Burenkov et al. [1975]). |
| Bulk modulus (compressibility-1) | Bs= 5.81·1011 dyn/cm2 |
| Shear modulus | C'= 1.90·1011 dyn/cm2 |
| [100] Young's modulus | Yo= 5.14·1011 dyn/cm2 |
| [100] Poisson ratio | σo = 0.35 |
| Wave propagation Direction | Wave character | Expression for wave speed | Wave speed (in units of 105 cm/s) |
| [100] | VL | (C11/ρ )1/2 | 3.83 |
| VT | (C44/ρ )1/2 | 2.64 | |
| [100] | Vl | [(C11+C12+2C44)/2ρ]1/2 | 4.28 |
| Vt|| | Vt||=VT=(C44/ρ)1/2 | 2.64 | |
| Vt⊥ | [(C11-C12)/2ρ]1/2 | 1.83 | |
| [111] | Vl' | [(C11+2C12+4C44)/3ρ]1/2 | 4.41 |
| Vt' | [(C11-C12+C44)/3ρ]1/2 | 2.13 |
| νTO(Γ) | 6.44 | νLO (X) | 6.20 |
| νLO(Γ) | 7.01 | νTA(L) | 1.50 |
| νTA(X) | 1.70 | νLA(L) | 4.46 |
| νLA(X ) | 4.94 | νTO(L) | 6.44 |
| νTO(X ) | 6.47 | νLO(L) | 6.26 |
|
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