INFRARED STUDIES OF APATITES .2. PREPARATION OF NORMAL AND ISOTOPICALLY SUBSTITUTED CALCIUM, STRONTIUM, AND BARIUM HYDROXYAPATITES AND SPECTRA-STRUCTURE-COMPOSITION CORRELATIONS
INFRARED STUDIES OF APATITES .2. PREPARATION OF NORMAL AND ISOTOPICALLY SUBSTITUTED CALCIUM, STRONTIUM, AND BARIUM HYDROXYAPATITES AND SPECTRA-STRUCTURE-COMPOSITION CORRELATIONS
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DOI：
10.1021/ic50131a040
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发表时间：
1974-01-01
影响因子：
4.6
通讯作者：
FOWLER, BO
中科院分区：
文献类型：
--
作者：
FOWLER, BO
描述了制备钙、锶和钡羟基磷灰石、它们的氚类似物和富含同位素钙的羟基磷灰石的方法，特别强调纯度、化学计量比、晶体完整性和对磷灰石成分的重量监测。讨论了低温和磷灰石物理性质的差异对红外振动频率的影响。在钡-锶-钙羟基磷灰石序列和冷却过程中，内部磷酸盐模式向更高频率移动，主要归因于伴随着晶格收缩而增加的磷间排斥力。我们从几个角度考虑了THO模频率和强度变化的原因，包括弱的OH-O键的存在，这种键既没有被确定，也没有被拒绝。在氢氧磷灰石系列中，氢键强度的显著增加归因于氢键的差异，而不是其他效应。
Procedures are described for preparation of calcium, strontium, and barium hydroxyapatites, their deuterated analogs, and calcium hydroxyapatite enriched with isotopic calcium with particular emphasis on purity, stoichiometry, crystal perfection, and gravimetrically monitoring the apatite composition. The effects of low temperature and differences in physical properties of the apatites on the infrared vibrational frequencies are discussed. Shifts in the internal phosphate modes to higher frequencies, in the barium-strontium-calcium hydroxyapatite sequence and also on cooling, are attributed primarily to in-creased interphosphate repulsion concomitantwith lattice contraction. Causes for variation in thefrequencies and intensities of theOH modes are considered from several viewpoints including the presence of weak OH—O bonding which is neither conclusively established nor rejected. Marked increases in OH band intensities in the barium-strontium-calcium hy-droxyapatite sequence are attributed to differences in OH bonding rather than to other effects.