A XRD and TEM study on the transformation of amorphous calcium phosphate in the presence of magnesium
A XRD and TEM study on the transformation of amorphous calcium phosphate in the presence of magnesium
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DOI：
10.1016/0022-0248(96)00156-x
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发表时间：
1996-07-01
影响因子：
1.8
通讯作者：
Baronnet, A
中科院分区：
文献类型：
--
作者：
Abbona, F;Baronnet, A
通过组合的X射线、电子衍射和TEM成像，以固定的时间间隔跟踪在25 ℃下从浓度[Ca] = [P] = 5mM、pH = 7.94的溶液中沉淀的无定形磷酸钙（ACP）的演变。在镁离子（C = 1mM）存在下进行相同的试验。只有一种无定形化合物被观察到（ACP 1），它似乎直接变成磷灰石（HAP）没有结晶中间体。高分辨透射电镜分析发现HAP中存在刃位错和晶界。镁对ACP转化为HAP和对HAP的晶体结构和习性的影响被解释在掺入和表面吸附方面。
The evolution of the amorphous calcium phosphate (ACP), precipitated at 25 degrees C from solutions of concentration [Ca] = [P] = 5 mM at pH = 7.94, was followed at fixed time intervals by combined X-ray, electron diffraction and TEM imaging. The same runs were carried out in the presence of magnesium ions (C = 1 mM). Only one kind of amorphous compound was observed (ACP1), which seems to change directly into apatite (HAP) without crystalline intermediate. Edge dislocations and grain boundaries were found by HRTEM analysis in HAP. The effects of magnesium on conversion of ACP into HAP and on the crystal structure and habit of HAP are interpreted in terms of incorporation and surface adsorption.