✦ LIBER ✦

Non-stoichiometry of apatites at high temperatures

✍ Scribed by Prof. Dr. J. Arends; Mr. J. Schuthof; Drs. G. J. Flim

Publisher: John Wiley and Sons
Year: 1973
Tongue: English
Weight: 208 KB
Volume: 8
Category: Article
ISSN: 0232-1300
DOI: 10.1002/crat.19730080810

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Schottky defects in apatites are formed by a decomposition reaction at temperatures in excess of 1000°K. In this investigation thermogravimetrie experiments on fluorapatite single crystals and powders have been carried out in the temperature range 1000–1600°K. Relative weightlosses of 1.2 × 10^−3^ per hour corresponding to Ca/P decreases of 0.0002 per hour have been observed at 1675°K. In the temperature range studied the number of vacancy triplets formed per second is in the order of 10^18^. The activation energy (1.15 eV) involved indicates that dislocations might play an important role in the decomposition process.

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