Anomalous Growth of MoO_3 Crystals

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概要

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• The growth of molybdenum trioxide crystals from the vapour phase in air and in oxygen gas was studied optically, and an extraordinary growth mechanism was found. The vapour impinging upon a surface did not crystallize directly, but instead it passed through a liquid state before crystallization. The liquid consists of MoO_3 and MoO_3', the latter being a new phase probably related to the polymerization of MoO_3 vapour or the liquid structure of MoO_3. The lattice parameters of MoO_3' were estimated from the X-ray data. The origination and stability of the liquid phase were discussed briefly, and it was ascertained that this crystallization mechanism accelerates remarkably the growth rate of the crystal. Also the anisotropy of surface migration of the vapour molecules adsorbed on the crystal surface was analysed. The migration velocity of adsorbed molecules is about 1.5 times larger in the c-direction than in the α-direction of MoO_3 crystal, and hence the morphology of closed loop steps was accounted for.

• 社団法人日本物理学会の論文
• 1960-05-05

著者

• Yoda Eiji

  Department Of Physics Faculty Of Science Kyoto University

関連論文

• On the Anomaly of the Dielectric Properties of n-Higher Alcohols
• Anomalous Growth of MoO_3 Crystals
• Growth and Evaporation of Tungsten Oxide Crystals

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