Vapour growth and morphology of PbBr2 crystals by Takamasa Kaito, Shin-Ichiro Yanagiya, Atsushi Mori, and Tetsuo Inoue

Crystal Research and Technology

Cryst. Res. Technol. 42, 652 (2007) - Abstract -

Vapour growth and morphology of PbBr₂ crystals

Takamasa Kaito, Shin-Ichiro Yanagiya, Atsushi Mori, and Tetsuo Inoue

Department of Optical Systems Engineering, Institute of Technology and Science, The University of Tokushima, 2-1 Minamijyosanjima, Tokushima 770-8506, Japan

Keywords	surface roughening, surface melting, growth from vapour, lead bromide, Knudsen flow
PACS	68.10.Ct, 81.10.Bk
DOI	10.1002/crat.200610883

In this paper, the vapour transport of PbBr₂ under vacuum during vacuum distillation refining and its condensation on the wall of the vessel were described. The macro- and micro morphologies of PbBr₂ crystals grown in the vessel (glass tube) were studied. The crystal shape changed dramatically depending on the positions of condensation in the vessel, i.e., the crystal shape varied from an isometric polyhedron to columnar crystals with facets, and to a massive crystal without facets with a rise in the wall temperature. These results were interpreted in terms of the concentration gradient of the molecules in the vessel, surface roughening and/or surface melting of the crystals.

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