Abstract
The effect of yttria on the solid reaction mechanism of a CaHPO4·2H2O + CaCO3 system at different temperatures was experimentally studied. The samples with and without yttria were subjected to thermogravimetric/differential scanning calorimetry measurement. The samples were heat treated at the temperatures corresponding to the peaks on the DSC spectra, and the resulted phase compositions were identified by X-ray diffraction. The transformation mechanism was deduced by comparing the phases obtained at different temperatures. The results show that the transformations at below 1073 K are not affected by yttria, but all those at above 1073 K are completely altered. The formation temperature of hydroxyapatite decreases by 134 K, and the decomposition temperature increases by 38 K. The polymorphous transformation of Ca3(PO4)2 from β phase to α phase increases by 47 K. The thermodynamic properties of the transformations at above 1073 K are also modified by the addition of yttria; that is, the endothermal peaks are substituted by exothermal peaks.
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Wang, Y., Gao, J., Hu, J. et al. Solid reaction mechanism of CaHPO4·2H2O + CaCO3 with and without yttria. Rare Metals 28, 77–81 (2009). https://doi.org/10.1007/s12598-009-0015-5
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DOI: https://doi.org/10.1007/s12598-009-0015-5