Growth of alkaline-earth vanadate garnet by synthetic contact metamorphism with molten V₂O₅–Na₂SiO₃ acting on dolomite

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• 作者：T.F. Ciszek
• 关键词：A1. Synthetic contact metamorphism ; A1. X-ray diffraction ; A2. Growth from high-temperature solutions ; B1. Vanadates
• 刊名：Journal of Crystal Growth
• 出版年：2006
• 出版时间：25 January 2006
• 年：2006
• 卷：287
• 期：2
• 页码：323-325
• 全文大小：234 K

文摘

The garnet-structured compound Ca₂NaMg₂V₃O₁₂ is amenable to growth in the laboratory by synthetic contact metamorphism using a solution of V₂O₅ and Na₂SiO₃ in the approximate ratio 4.3:1 acting on dolomite marble “rock.” Cooling a 320 g crucible-charge at −2.6 °C min⁻¹ from a soak temperature of 1020 °C yielded drusy clusters of crystals exhibiting characteristic {2 1 1} and {1 1 0} garnet faces, with individual crystals as large as 5 mm. X-ray powder diffraction confirmed a cubic garnet structure with lattice constant=12.42₇ Å. The crystals had a specific gravity of 3.43 g cm⁻³, refractive index >1.8, and Mohs hardness about 4.