Abstract
AbstractThe structures of single crystals of theα-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 theβ-quartz structure type thanα-quartz itself with average tetrahedral tilt anglesδof 19.7° and 24.6° for BPO4and BAsO4, respectively. The structure of BAsO4is one of the most highly distorted found amongα-quartz homeotypes. It is shown that for the knownα-quartz homeotypes, the density, which can be related to the frequency constant for piezoelectric resonators, scales with the intertetrahedral bridging angleθ.
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