FTIR study of carbonate loss from carbonated apatites in the wide temperature range.
FTIR study of carbonate loss from carbonated apatites in the wide temperature range.
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宽温度范围内碳酸磷灰石碳酸盐损失的 FTIR 研究。
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
I. Fadeeva
中科院分区：
文献类型：
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作者：
J. Rau;S. Cesaro;Daniela Ferro;S. Barinov;I. Fadeeva
骨组织的矿物质成分是碳酸盐取代磷灰石（CHA）。研究表明，CHA的热稳定性取决于取代类型和程度，尽管人们对这种行为知之甚少。本研究的目的是调查碳酸盐损失从合成CHA在平衡条件下，在很宽的温度范围。基于冷凝气相的FTIR光谱的方法被应用于评估CO和CO2随温度升高的释放。四个不同的CHA进行了研究，这是从溶液中沉淀或固态相互作用制备。这些样品的取代度彼此不同。在其中一个样品中，钙部分被镁取代。分解显示在令人惊讶的低温度（约400摄氏度）下开始，并且CO含量随着温度的增加而单调增加。CO2含量由于其分解成一氧化碳和氧气而经历最大值，该最大值的温度强烈依赖于化学合成路线。因此，在制备碳酸化磷灰石生物陶瓷时，需要控制烧结气氛中的CO2/CO比。
The mineral constituent of bone tissue is a carbonate-substituted apatite (CHA). The thermal stability of the CHA has been revealed to depend on the substitution type and degree, although relatively little is known about this behavior. The aim of this study was to investigate the carbonate loss from synthetic CHAs in equilibrium conditions in a wide temperature range. An approach based on FTIR spectroscopy of condensed gas phase was applied to evaluate the CO and CO2 release with increasing temperature. Four different CHAs were studied, which were prepared by either precipitation from solution or the solid-state interaction. The samples differ from each other by the substitution degree. In one of the samples calcium was partially substituted by magnesium. Decomposition was shown to start at surprisingly low temperature, about 400 degrees C, and the CO content increases monotonously with the increase of temperature. The CO2 content goes through a maximum due to its decomposition into carbon monoxide and oxygen, the temperature of this maximum being strongly dependent on the chemical synthesis route. Therefore, control of the sintering atmosphere with respect to the CO2/CO ratio is needed when preparing the carbonated apatite bioceramics.