Calcium fluorosilicates: The Ca6-0.5xSi2O10-xFx phase

The identity of Ca 6 0 5 Si201~ F with other germanate1 X ~ 1 Xand silicate phases r~ported in the literature is confirmed by X-ray methods. The crystals exhibit superstructure which is interpreted as arising from ordering of Ca vacancies in the [203] direction. Its crystallochemical relationships with other fluorosilicate and germanates is discussed.

This work was made possible by a grant to M. P~rez M~ndez from C.S.I.C., Spain, and a grant to J. Fayos from The Royal Society. J. Fayos also wishes to acknowledge the Instituto Rocasolano for leave of absence and M. Pérez Méndez to Instituto E. Torroja for her leave of absence.

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