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Crystal structures of α-quartz homeotypes boron phosphate and boron arsenate: structure-property relationships

✍ Scribed by Fertey, Pierre; Chateau, Christian; Haines, Julien; Cambon, Olivier; Astier, René

Book ID
111889149
Publisher
Oldenbourg Wissenschaftsverlag
Year
2004
Tongue
English
Weight
195 KB
Volume
219
Category
Article
ISSN
2194-4946

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✦ Synopsis

Abstract

The structures of single crystals of the__α__-quartz homeotypes boron phosphate and boron arsenate prepared under high-pressure, high-temperature conditions in a belt-type apparatus were determined by X-ray diffraction. Both structures are more distorted with respect to the__β__-quartz structure type than__α__-quartz itself with average tetrahedral tilt angles__δ__of 19.7° and 24.6° for BPO~4~and BAsO~4~, respectively. The structure of BAsO~4~is one of the most highly distorted found among__α__-quartz homeotypes. It is shown that for the known__α__-quartz homeotypes, the density, which can be related to the frequency constant for piezoelectric resonators, scales with the intertetrahedral bridging angle__θ__.

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