Crystal Growth of γ<sub>II</sub>-Li<sub>2</sub>ZnSiO<sub>4</sub> by Flux Method

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  • Ｎａ?S２?TＯ‐ＣａＯ‐ＳｉＯ?S２?Tガラスのアルカリ溶液による侵食
  • フラックスホウ ニヨル ガンマ2 Li2ZnSiO4 ノ ケッショウ セイチョ

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Single crystals of γII-Li2ZnSiO4 were grown from Li2MoO4 and Li2WO4 solvents by the slow cooling flux method. The growth experiments were accomplished at the soaking temperatures of 1270°-1420°C and the cooling rates of 3.3°-7.0°C/h. Zn2SiO4 was more suitable as a starting material for the crystal growth than Li2ZnSiO4 and a mixture of Zn2SiO4 and SiO2. During soaking period, crystals of the composition, Li2ZnSiO4, were produced by reaction of Zn2SiO4 and the flux of Li2MoO4 as follows:<br>Zn2SiO4+Li2MoO4→Li2ZnSiO4+ZnO+MnO3<br>The grown crystals up to 3mm across were obtained generally as mixtures of transparent and translucent ones. Many transparent γII-Li2ZnSiO4 crystals, which were stable above 961°C, were obtained when the soaking temperature was below 1368°C. The translucent crystals were found to contain imperfections of many fine cracks which were induced by volume shrinkage of 1.9% due to transformation of small or large part of primarily-grown γII-Li2ZnSiO4 crystals to βII-phase below 961°C during slow cooling. The platy and granular γII-Li2ZnSiO4 crystals were sometimes well-faceted and surrounded by (010), (120) and (101) faces.<br>Space group P21/n, Z=4 and density 3.41 for γII-Li2ZnSiO4 crystal were determined. Its monoclinic lattice constants are a0=6.2823, b0=10.626, c0=5.0327(Å) and β=90.49°. The orthorhombic lattice constants for βII-Li2ZnSiO4 are a0=6.2592, b0=10.626 and c0=4.9529(Å).

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