Elastic
constants cij (1011 dyn/cm2
or 1010 Pa):
| 5.59 |
5.13 |
2.17 |
0 |
0 |
0 |
| 5.13 |
5.59 |
2.17 |
0 |
0 |
0 |
| 2.17 |
2.17 |
10.56 |
0 |
0 |
0 |
| 0 |
0 |
0 |
2.67 |
0 |
0 |
| 0 |
0 |
0 |
0 |
2.67 |
0 |
| 0 |
0 |
0 |
0 |
0 |
6.62 |
Photoelastic constants
pij:
| 0.0074 |
0.187 |
0.34 |
0 |
0 |
0 |
| 0.187 |
0.0074 |
0.34 |
0 |
0 |
0 |
| 0.0905 |
0.0905 |
0.24 |
0 |
0 |
0 |
| 0 |
0 |
0 |
-0.17 |
0 |
0 |
| 0 |
0 |
0 |
0 |
-0.17 |
0 |
| 0 |
0 |
0 |
0 |
0 |
-0.0463 |
Sound velocity:
| direction |
polarization |
v
(105 cm/s) |
| [100] |
[100],
L |
3.051 |
| [100] |
[010],
S |
3.317 |
| [100] |
[001],
S |
2.1 |
| [001] |
[001],
L |
4.202 |
| [001] |
arb,
S |
2.104 |
| [110] |
[110],
L |
4.663 |
| [110] |
[1-10],
S |
0.616 |
| [110] |
[001],
S |
2.1 |
| [101] |
[-101],
S |
2.101 |
Acousto-optic figure
of merit:
| sound
dir. |
sound
pol. |
light
dir. |
light
pol. |
M
(10-18 s3/g) |
| [100] |
[100],
L |
[010] |
[100] |
0.048 |
| [100] |
[100],
L |
[010] |
[001] |
10.6 |
| [001] |
[001],
L |
[010] |
[100] |
34.5 |
| [001] |
[001],
L |
[010] |
[001] |
25.6 |
| [101] |
[-101] |
[010] |
[100] |
77.7 |
| [110] |
[1-10],
S |
[001] |
circ. |
1200 |
|
Refraction
indices:
| l
(mkm) |
nx |
ny |
nz |
| 0.4047 |
2.4315 |
2.4315 |
2.6167 |
| 0.4358 |
2.3834 |
2.3834 |
2.5583 |
| 0.4678 |
2.3478 |
2.3478 |
2.5164 |
| 0.48 |
2.3366 |
2.3366 |
2.5036 |
| 0.5086 |
2.315 |
2.315 |
2.4779 |
| 0.5461 |
2.2931 |
2.2931 |
2.452 |
| 0.5893 |
2.2738 |
2.2738 |
2.4295 |
| 0.6328 |
2.2597 |
2.2597 |
2.4119 |
| 0.6438 |
2.2562 |
2.2562 |
2.4086 |
| 0.69 |
2.245 |
2.245 |
2.3955 |
| 0.8 |
2.226 |
2.226 |
2.373 |
| 1 |
2.208 |
2.208 |
2.352 |
NOTE: It
should be taken into account that nx=ny=nz=n
for optically isotropic material and nx=ny=no
and nz=ne
for uniaxial crystal. |
Crystal symmetry:
422
Density: 6.02 g/cm3
Optical spectral range: 0.35 - 5 mkm
Cell Dimensions:
a = 4.81, c = 7.613, Z = 4; V = 176.14 Den(Calc)= 6.02
Crystal System: Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space
Group: P 41212,P 43212
X Ray Diffraction:
By Intensity(I/Io): 2.988(1), 3.404(0.86), 1.873(0.55) |
