無機物質の複雑の構造を作り上げている単位胞レベルの双晶

概要

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The word ‘tropochemical cell twinning’ was given to such a twinning on cell scale that yields, with concomitant changes in composition, a chemical series of structures. A review has been presented on this sort of cell twinning which is here reworded as ‘TCT mechanism’. Examples of the PbS-Bi<SUB>2</SUB>S<SUB>3</SUB> system, pinakiolite-orthopinakiolite series, and enstatite IV series have shown a common feature of the mechanism that it is closely related to the generation of defect structures or deviation from ideal stoichiometry; a great majority of so called ‘extended defect structures’ may be systematically discussed along this mechanism. A brief survey has been given together on the historical development on the concept of cell twinning which originated with Teiichi Ito, M. J. A., as early as 1935.
日本結晶学会の論文