INFRA-RED SPECTRA OF HYDROXYAPATITE OCTACALCIUM PHOSPHATE AND PYROLYSED OCTACALCIUM PHOSPHATE
INFRA-RED SPECTRA OF HYDROXYAPATITE OCTACALCIUM PHOSPHATE AND PYROLYSED OCTACALCIUM PHOSPHATE
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DOI：
10.1016/0003-9969(66)90154-3
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发表时间：
1966-01-01
影响因子：
3
通讯作者：
BROWN, WE
中科院分区：
文献类型：
--
作者：
FOWLER, BO;MORENO, EC;BROWN, WE
研究了羟基磷灰石、磷酸八钙和热解磷酸八钙在 4000-400 cm-1 范围内的红外光谱，并给出了可能的谱带分配。磷酸八钙（13 个条带）和羟基磷灰石（5 个条带）均发现了未报告的条带； 631 cm-1 处的羟基磷灰石带被重新分配给羟基的释放模式。通过红外吸收、失重和焦磷酸盐分析研究了磷酸八钙的热解反应。简单脱水在50至约400℃之间连续进行。 325~600℃之间的主要产物是羟基磷灰石和β-Ca2P2O7；在650至900℃之间，产物为β-Ca2P2O7和β-Ca3(PO4)2。在比报道的温度更低的温度（325℃）下检测到β-Ca 2 P 2 O 7 的形成，而不是γ-Ca 2 P 2 O 7 的形成。 500℃时形成的焦磷酸盐的最大量约为40％，处于其他研究中假设的反应预测的量之间。从700℃到900℃，焦磷酸盐含量接近预期值。
Infra-red spectra of hydroxyapatite, octacalcium phosphate and pyrolyzed octacalcium phosphate were studied in the range 4000-400 cm-1, and probable band assignments are given. Unreported bands were found for both octacalcium phosphate 13 bands) and hydroxyapatite (5 bands); the hydroxyapatite band at 631 cm-1 was reassigned to the liberational mode of the hydroxyl group. The pyrolysis reactions of octacalcium phosphate were studied by infra-red absorption, weight loss, and pyrophosphate analysis. Simple dehydration was continuous from 50 to about 400[degree]C. The major products between 325 and 600[degree]C were hydroxyapatite and [beta]-Ca2P2O7; between 650 and 900[degree]C, the products were [beta]-Ca2P2O7 and [beta]-Ca3 (PO4)2. Formation of [beta]-Ca2P2O7, instead of [gamma]-Ca2P2O7, was detected at a lower temperature (325[degree]C) than has been reported. The maximum amount of pyrophosphate formed, about 40% at 500[degree]C, was intermediate between the amounts predicted by reactions postulated in other studies. From 700 to 900[degree]C, the pyrophosphate content approximated the expected value.