Crystal

Birefr-ingence D=he-ho

Refractive index h at l= 0.63m

Thermooptical Coef.dh/dT 10⁶/K

Structure  lattice constant (A)

Melting point ^oC

Density g/cm³

Hard-ness (Moh)

Thermal Coef. 10-⁶/K

YVO₄

+ 0.222

ho=1.9929
he=2.2154

a: -8.5
c: -3.0

Tetragonal    a=7.12 c= 6.29

1825

4.22

5

a: 4.46
c: 11.37

TiO2

+ 0.282

ho=2.583
he=2.865

a: -0.72
c: -0.42

Tetragonal  a=4.593 c=2.958

1840

4.26

7

a: 7.14
c: 9.19