Vibrational spectra of some phosphate salts amorphous to X-ray diffraction
Vibrational spectra of some phosphate salts amorphous to X-ray diffraction
复制标题
一些无定形磷酸盐的 X 射线衍射振动光谱
DOI：
10.1007/bf02059043
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
D. R. Lundy
中科院分区：
文献类型：
--
作者：
J. Termine;D. R. Lundy
Complete infrared and Raman spectral data are presented for a number of phosphate salts amorphous to X-ray and electron diffraction and spherical in morphology under the electron microscope. These were amorphous calcium, magnesium and copper (II) orthophosphate; amorphous calcium carbonate orthophosphate; and amorphous calcium pyrophosphate. The average coordination (bond arrangement) in these materials was non-isotropic, i.e., perturbed relative to that in a completely symmetric milieu. The data suggest that these bond arrangements do not correspond to phosphate crystal lattices. Two spatial configurations are possible for these amorphous salts: 1) a random packing of unit coordination structures having constant composition and fixed bonding relationships; or 2) a random network of coordination complexes whose exact composition and structure can vary from site to site. Cationic constituents strongly influenced bonding and water molecules appeared to contribute to coordination structure. In amorphous carbonate phosphates, regions rich in either calciumphosphate or calcium-carbonate bonding appeared to be contiguous with areas exhibiting mixed ion coordination.
