Synthesis and thermal behavior of well-crystallized calcium-deficient phosphate apatite
1989; Elsevier BV; Volume: 78; Issue: 2 Linguagem: Inglês
10.1016/0022-4596(89)90099-6
ISSN1095-726X
AutoresAnne Mortier, J. Lemaı̂tre, L. Rodrique, Paul G. Rouxhet,
Tópico(s)Chemical Synthesis and Characterization
ResumoLarge crystals (0.5 × 0.5 × 10 μm) of calcium-deficient hydroxyapatites (DAp's) have been synthesized by aqueous precipitation under controlled conditions of pH and temperature. The samples have been characterized using chemical analysis, temperature-programmed dehydration (TPR). X-ray diffraction, IR spectroscopy, and transmission electron microscopy. They show that very well-crystallized DAp's with Ca/P close to 1.50 can be obtained under well-selected synthesis conditions. The specimens presented typical TPR patterns, consisting of a diffuse evolution of water in the range 300–700°C and a sharper one in the range 700–900°C. The maximum temperatures of the TPR bands were found to be markedly higher for the DAp specimen having the largest crystal size.
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