热处理对纳米羟基磷灰石的相结构和粒度的影响

Effects of calcinations on the crystallinity,morphology and particle sizes of precipitated hydroxyapatite powders

采用化学沉淀法合成纳米羟基磷灰石粉体，研究了热处理对纳米颗粒的相结构和粒度的影响，用FT-IR、XRD、TEM等对纳米羟基磷灰石粉体进行了表征。结果表明，沉淀法合成的纳米HA粉体含有少量Co3^2-离子，900℃煅烧后CO3^2-离子完全脱除。随热处理温度的提高，颗粒的形状由长条或针状变为球形，700℃热处理后可以得到晶化良好、平均直径50～55nm的球形纳米HA颗粒。

Nanometer hydroxyapatite was synthesized based on wet chemical precipitation method. Effects of calcinations on crystallinity, morphology and particle size of the precipitated HA powders were studied. FT-IR spectroscopy, X-ray diffraction （XRD）, transmission electron microscopy（TEM）, and electron diffraction（ED） were employed to characterize the as-obtained HA powders. The results showed that crystallinity of the HA powders was improved dramatically after calcinations, and the particle sizes were also increased. Calcinations temperature of 700℃ was appropriate to obtain highly-crystallized nanometer hydroxyapatite powders.