Yttrium Orthovanadate - Basic Properties

Basic Properties

Crystal structure:
- Zircon tetragonal (tetragonal bipyramidal)
- Space group D_4h
- Lattice parameters a = b = 7.119 Å, c = 6.290 Å

Density: 4.24 g/cm3
Melting point: 1810–1940 °C
Mohs hardness: glass-like, ~5
Knoop hardness: 480 kg/mm2
Thermal expansion coefficient:
- α_a = 4.43×10−6/K
- α_c = 11.37×10−6/K

Thermal conductivity coefficient:
- parallel to c-axis: 5.23 W·m−1·K−1
- perpendicular to c-axis: 5.10 W·m−1·K−1

Refractive indices, birefringence ( Δn = n_e - n_o) and walk-off angle at 45° (ρ):
- at 0.63 µm:
  - n_e = 2.2154
  - n_o = 1.9929
  - Δn = 0.2225
  - ρ = 6.04
- at 1.30 µm:
  - n_e = 2.1554
  - n_o = 1.9500
  - Δn = 0.2054
  - ρ= 5.72
- at 1.55 µm:
  - n_e = 2.1486
  - n_o = 1.9447
  - Δn = 0.2039
  - ρ = 5.69
- Sellmeier equation (λ in µm):
  - n_e2=4.59905 + 0.110534/(λ2 − 0.04813) − 0.012267612 λ2
  - n_o2=3.77834 + 0.069736/(λ2 − 0.04724) − 0.0108133 λ2

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