RADIAL DISTRIBUTION STUDY OF NON-CRYSTALLINE TRICALCIUM PHOSPHATE
RADIAL DISTRIBUTION STUDY OF NON-CRYSTALLINE TRICALCIUM PHOSPHATE
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DOI：
10.1016/0025-5408(70)90134-0
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发表时间：
1970-01-01
影响因子：
5.4
通讯作者：
POSNER, AS
中科院分区：
文献类型：
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作者：
HARPER, RA;POSNER, AS
对冷冻干燥稳定的非结晶磷酸三钙的x射线散射（钴和镍过滤的铜辐射）进行了径向分布研究。此外，根据已发表的羟基磷灰石原子参数计算出理论径向分布函数。在径向分布函数中，非晶相和晶相在约1.6A （P-O）、2.4A （O-O、Ca-O）和3.7A处均出现峰值。后两种非晶态离子间距略大于类似的磷灰石间距，表明非晶态密度较低。此外，无定形曲线在4.7A处有一个峰，在磷灰石中没有，但在凝聚磷酸钙玻璃的曲线中发现。在磷灰石和无定形曲线中都没有出现2.9A的峰值，这与在凝聚磷酸盐如间磷酸盐和焦磷酸盐中发现的最近P-P距离有关。这些结果支持了无定形磷酸三钙虽然是羟基磷灰石的前体，但在化学和物理上与羟基磷灰石不同的观点。
A radial distribution study was performed on the x-ray scattering (cobalt- and nickel-filtered copper radiation) from freeze-dried stabilized, non-crystalline tricalcium phosphate. In addition, a theoretical radial distribution function was calculated from the published atomic parameters of hydroxyapatite. Both the amorphous and crystalline phases showed peaks in the radial distribution function at about 1.6A (P-O), 2.4A (O-O, Ca-O), and 3.7A. The latter two amorphous interionic spacings were slightly larger than the comparable apatite spacings indicative of a lower density in the amorphous phase. In addition, the amorphous curve contained a peak at 4.7A not present in apatite but found in curves from condensed calcium phosphate glasses. Not present in either the apatite or the amorphous curve was a peak at 2.9A which is related to the nearest P-P distance found in such condensed phosphates as meta- and pyrophosphate. These results support the view that the amorphous tricalcium phosphate, though a precursor of hydroxyapatite, is different chemically and physically from this compound.