机械化学合成CaO、CaF2和P2O5前驱体形成纳米结构氟磷灰石的机理

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL

Progress in Reaction Kinetics and Mechanism Pub Date : 2018-10-01 DOI:10.3184/146867818X15233705894419

R. N. Mofrad, S. Sadrnezhaad, J. V. Khaki

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引用次数: 1

摘要

通过对中间化合物的表征，确定了以CaO、CaF2和P2O5为原料机械化学合成氟磷灰石的机理。我们利用原子吸收光谱、x射线衍射、场发射扫描电镜、红外光谱和透射电镜等方法寻找过渡化合物。对二元和三元粉末混合物进行了研究，发现中间化合物为H3PO4、Ca(OH)2、Ca2P2O7和CaCO3。在制粉初期，P2O5转化为H3PO4, CaO转化为Ca(OH)2发生在湿气氛中。随后，Ca(OH)2与H3PO4结合形成ca2p2o7，而未反应的CaO被周围大气中的CO2转化为CaCO3。Ca2P2O7、CaCO3和CaF2在研磨48 h后形成球形结晶Ca10 (PO4)6F2颗粒。

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Mechanism of Nanostructured Fluorapatite Formation from CaO, CaF2 and P2O5 Precursors by Mechanochemical Synthesis

We determined the mechanism of mechanochemical synthesis of fluorapatite from CaO, CaF2 and P2O5 by characterisation of the intermediate compounds. We used atomic absorption spectroscopy, X-ray diffraction, field emission scanning electron microscopy, FTIR spectroscopy and transmission electron microscopy to find the transitional compounds. Investigation of the binary and ternary powder mixtures revealed the appearance of H3PO4, Ca(OH)2, Ca2P2O7 and CaCO3 as the intermediate compounds. At early stages of the milling, conversions of P2O5 to H3PO4 and CaO to Ca(OH)2 occurred in the wet atmosphere. Later, a combination of Ca(OH)2 and H3PO4 formed C a2P2O7 while the unreacted CaO was converted to CaCO3 by CO2 of the ambient atmosphere. Spherical crystalline Ca10 (PO4)6F2 particles formed after 48 hours of milling due to the reaction between Ca2P2O7, CaCO3 and CaF2.

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来源期刊

Progress in Reaction Kinetics and Mechanism 化学-物理化学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

2.3 months

期刊介绍： The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.