my-server
← Wiki Redirected from Yttrium vanadate

Yttrium orthovanadate

Yttrium orthovanadate (YVO<sub>4</sub>) is a transparent crystal. Undoped YVO<sub>4</sub> is used to make efficient high-power polarizing prisms similar to Glan–Taylor prisms. With a chemical structure very similar to wakefieldite ([La,Ce,Nd,Y]VO<sub>4</sub>), it is also sometimes used as a synthetic gemstone since the former is prohibitively rare.

There are two principal applications for doped yttrium orthovanadate:

Basic properties

  • Crystal structure:
  • Zircon tetragonal (tetragonal bipyramidal)
  • Space group D<sub>4h</sub>
  • Lattice parameters a = b = 7.119 ÃÂ, c = 6.290 ÃÂ
  • Density: 4.24 g/cm<sup>3</sup>
  • Melting point: 1810–1940&nbsp;°C
  • Mohs hardness: glass-like, ~5
  • Knoop hardness: 480&nbsp;kg/mm<sup>2</sup>
  • Thermal expansion coefficient:
  • α<sub>a</sub> = 4.43×10<sup>−6</sup>/K
  • α<sub>c</sub> = 11.37×10<sup>−6</sup>/K
  • Thermal conductivity coefficient:
  • parallel to c-axis: 5.23 W·m<sup>−1</sup>·K<sup>−1</sup>
  • perpendicular to c-axis: 5.10 W·m<sup>−1</sup>·K<sup>−1</sup>
  • Refractive indices, birefringence ( Δn = n<sub>e</sub> - n<sub>o</sub>) and walk-off angle at 45° (ρ):
  • at 0.63 μm:
  • n<sub>e</sub> = 2.2154
  • n<sub>o</sub> = 1.9929
  • Δn = 0.2225
  • ρ = 6.04
  • at 1.30&nbsp;μm:
  • n<sub>e</sub> = 2.1554
  • n<sub>o</sub> = 1.9500
  • Δn = 0.2054
  • ρ= 5.72
  • at 1.55&nbsp;μm:
  • n<sub>e</sub> = 2.1486
  • n<sub>o</sub> = 1.9447
  • Δn = 0.2039
  • ρ = 5.69
  • Sellmeier equation (λ in μm):
  • n<sub>e</sub><sup>2</sup>=4.59905 + 0.110534/(λ<sup>2</sup> − 0.04813) − 0.012267612 λ<sup>2</sup>
  • n<sub>o</sub><sup>2</sup>=3.77834 + 0.069736/(λ<sup>2</sup> − 0.04724) − 0.0108133 λ<sup>2</sup>

See also

References