Abstract
The low temperature synthesis route of lanthanum silicate oxyapatite was investigated by x-ray diffraction and by carrying out thermal analyses using a precursor prepared by a water-based sol-gel method. The precursor was heated at 873 K, and it was found to consist of a lanthanum oxycarbonate (type IA-La2O2CO3), which has a layered stacked structure consisting of two-dimensional (La2O2)n2+ and two (CO3)n2- layers, and amorphous silica. Lanthanum silicate oxyapatite was found to be formed both by the in-situ chemical pulverization of La2O2CO3 into a nano-sized La2O3 powder and a solid-state reaction between the nano-sized powders of La2O3 and amorphous SiO2.
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