Yttrium Orthovanadate - Basic Properties

Basic Properties

  • Crystal structure:
    • Zircon tetragonal (tetragonal bipyramidal)
    • Space group D4h
    • 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:
    • αa = 4.43×10−6/K
    • αc = 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 = ne - no) and walk-off angle at 45° (ρ):
    • at 0.63 µm:
      • ne = 2.2154
      • no = 1.9929
      • Δn = 0.2225
      • ρ = 6.04
    • at 1.30 µm:
      • ne = 2.1554
      • no = 1.9500
      • Δn = 0.2054
      • ρ= 5.72
    • at 1.55 µm:
      • ne = 2.1486
      • no = 1.9447
      • Δn = 0.2039
      • ρ = 5.69
    • Sellmeier equation (λ in µm):
      • ne2=4.59905 + 0.110534/(λ2 − 0.04813) − 0.012267612 λ2
      • no2=3.77834 + 0.069736/(λ2 − 0.04724) − 0.0108133 λ2

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