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Yttrium orthovanadate (YVO4) is a transparent crystal. Undoped YVO4 is also used to make efficient high-power polarizing prisms similar to Glan–Taylor prisms. There are two principal applications for doped Yttrium orthovanadate: *Doped with neodymium it forms Nd:YVO4, an active laser medium used in diode-pumped solid-state lasers. *Doped with europium it forms Eu:YVO4, the dominant red phosphor used in cathode ray tubes especially in color TVs. ==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:〔(【引用サイトリンク】title=Yttrium Vanadate (YVO4) Crystal ) 〕 * * 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 ( Δ''n'' = ''n''e - ''n''o) and walk-off angle at 45° (ρ): * *at 0.63 µm: * * *''n''e = 2.2154 * * *''n''o = 1.9929 * * *Δ''n'' = 0.2225 * * *''ρ'' = 6.04 * *at 1.30 µm: * * *''n''e = 2.1554 * * *''n''o = 1.9500 * * *Δ''n'' = 0.2054 * * *''ρ''= 5.72 * *at 1.55 µm: * * *''n''e = 2.1486 * * *''n''o = 1.9447 * * *Δ''n'' = 0.2039 * * *''ρ'' = 5.69 * *Sellmeier equation (''λ'' in µm): * * *''n''e2=4.59905 + 0.110534/(λ2 − 0.04813) − 0.012267612 ''λ''2 * * *''n''o2=3.77834 + 0.069736/(λ2 − 0.04724) − 0.0108133 ''λ''2 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「yttrium orthovanadate」の詳細全文を読む スポンサード リンク
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