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Thermal stability of a modified sol-gel derived hydroxyapatite nanopowders

机译:改性溶胶 - 凝胶衍生的羟基磷灰石纳米粉粉的热稳定性

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Hydroxyapatite Ca10(PO4)6(OH)2 (HA) powder was successfully synthesized by a modified sol-gel method using a solution of calcium nitrate in ethanol, along with a solution of diammonium hydrogen phosphate in water and NH4OH as starting materials. The Ca/P molar ratio was maintained at 1.67. The powder was subjected to furnace and microwave heating to compare the decomposition of HA and study the crystallite sizes. It was found that microwave heated powders were pure HAP up to 230°C with absence of secondary phases. However, XRD patterns show that furnace heated powders convert completely to P-TCP when treated at 750°C and 1000°C. This result was confirmed by the absence of hydroxyl bands in the FT-IR spectra for these temperatures.
机译:通过使用乙醇中的硝酸钙溶液,通过硝酸钙溶液成功地合成羟基磷灰石Ca10(HA)2(HA)粉末,以及水中磷酸铵溶液和NH4OH作为原料。 Ca / P摩尔比保持在1.67。将粉末进行炉子和微波加热,以比较HA的分解并研究微晶尺寸。发现微波炉加热粉末纯度为230℃,不存在二次相。然而,XRD图案表明,当在750℃和1000℃处理时,炉加热粉末完全转化为P-TCP。通过对这些温度的FT-IR光谱中的羟基带不存在该结果。

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