固溶体
磷灰石
羟基磷灰石
晶格常数
间断(语言学)
水溶液
钙
热稳定性
材料科学
化学
矿物学
衍射
分析化学(期刊)
结晶学
物理化学
冶金
数学分析
物理
数学
有机化学
色谱法
光学
作者
Adriana Bigi,Massimo Gandolfi,Massimo Gazzano,Alberto Ripamonti,Norberto Roveri,S. A. Thomas
出处
期刊:Journal of The Chemical Society-dalton Transactions
日期:1991-01-01
卷期号: (11): 2883-2883
被引量:64
摘要
Continuous series of solid solutions of lead and calcium hydroxyapatites have been prepared by solid-state reaction as well as from aqueous solutions and characterized by X-ray diffraction and IR spectroscopic analyses. While the lattice constant a of the solid solutions varies linearly with composition, the variation of the lattice constant c does not follow Vegard's law but shows a discontinuity at about 50% lead atom content. A similar discontinuity has been observed in the variation of the IR frequencies with composition. Although lead incorporation seems to destabilize the apatite structure, the solid solutions prepared from aqueous media at a lead content around 50% exhibit a high thermal stability. The variation of c, thermal stability, as well as the frequencies and intensities of the IR bands of lead–calcium hydroxyapatite are interpreted on the basis of the inhomogeneous lead distribution in the two non-equivalent cation sites of the hydroxyapatite structure.
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