Synthesis, characterization and high temperature analysis of Al-containing hydroxyapatites
Synthesis, characterization and high temperature analysis of Al-containing hydroxyapatites
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DOI：
10.1016/s0022-0248(96)00728-2
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发表时间：
1997-02-01
影响因子：
1.8
通讯作者：
Cuisinier, FJG
中科院分区：
文献类型：
--
作者：
Mayer, I;Cohen, H;Cuisinier, FJG
通过在控制的pH（7.0和9.0）下从具有Al 3+（0-0.75%）和具有碳酸盐（0-6.1%）的水溶液中沉淀来合成羟基磷灰石。在pH 7.0时，Al 3+的吸收几乎完全，在pH 9.0时接近60%。获得了相对较低的Ca/P比。样品中的碳酸盐被鉴定为B型碳酸盐。六方磷灰石结构的晶格参数不受Al 3+含量的影响。X射线衍射峰的展宽表明随着样品中Al 3+含量的增加，结晶度降低。在pH 7.0下制备的非碳酸盐样品加热至700 ℃时部分转化为β-Ca-3（PO 4）（2）。热重分析表明，在80-120 ℃范围内释放吸附水，在120-600 ℃释放结晶水，在400 -600 ℃同时释放水和碳酸盐，在900 ℃总碳酸盐损失。这表明，在本工作的样品中，Al 3+离子是表面吸附的。讨论了Al ~（3+）和水含量与样品结晶度的关系。
Hydroxyapatites were synthesized by precipitation from an aqueous solution with Al3+ (0-0.75%) and with carbonate (0-6.1%) at controlled pH (7.0 and 9.0). The uptake of Al3+ was almost complete at pH 7.0 and close to 60% at pH 9.0. Relatively low Ca/P ratios were obtained. Carbonate in the samples was identified as B-type carbonate. The lattice parameters of the hexagonal apatite structure were not affected by the Al3+ content. Broadening of the X-ray diffraction peaks indicated a lowering of the crystallinity with increasing Al3+ content of the samples. Noncarbonated samples prepared at pH 7.0 and heated to 700 degrees C transform partially to beta-Ca-3(PO4)(2). Thermogravimetric analysis showed the release of adsorbed water in the 80-120 degrees C range, crystalline water at 120-600 degrees C, simultaneous water and carbonate release at 400 degrees-600 degrees C and total carbonate loss at 900 degrees C. It is suggested that in the samples of the present work Al3+ ions are surface adsorbed. The relationship found between Al3+ and water content and the crystallinity of the samples is discussed.