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
- at 0.63 µm:
Read more about this topic: Yttrium Orthovanadate
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