Analyses of fluorapatite prepared by both chemical precipitation and solid phase reaction methods

S. Yu. Sayenko NSC “Kharkov Institute of Physics and Technology”
V. А. Shkuropatenko NSC “Kharkov Institute of Physics and Technology”
R. V. Тarasov NSC “Kharkov Institute of Physics and Technology”
K. А. Prudyvus NSC “Kharkov Institute of Physics and Technology”
S. А. Savina NSC “Kharkov Institute of Physics and Technology”
A. V. Zykova NSC “Kharkov Institute of Physics and Technology”

Keywords: structure modification, fluorapatite, X-ray diffraction, differential thermal analysis, radioactive wastes immobilization

Abstract

At the present study the possibility of obtaining two compositions of Ca10(PO4)6F2 and Ca9Sr(PO4)6F2 fluoroapatites by both chemical deposition from solutions of the initial components and reaction in the solid phase was investigated. Using X-ray diffraction (XRD) method was shown that the fluorapatite synthesis based on calcium pyrophosphate with the addition of strontium takes place at lower temperatures. Fluoroapatite formation obtained by precipitation process is the result of the reaction between initial component solutions. At the process of heat treatment of obtained powders by XRD method was found that compared with fluorapatite obtained by solid phase reaction, fluorapatite obtained by precipitation method include less content of TCP phase. Maximum density (∼92 % of the theoretical value) is reached for the sample heat treated at 1250 °C with the exposure time up to 6 hours for fluorapatite obtained by precipitation and at a temperature 1200 °C with the exposure time up to 10 hours for fluorapatite prepared by reaction in the solid phase.

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Author Biographies

S. Yu. Sayenko, NSC “Kharkov Institute of Physics and Technology”

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V. А. Shkuropatenko, NSC “Kharkov Institute of Physics and Technology”

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R. V. Тarasov, NSC “Kharkov Institute of Physics and Technology”

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K. А. Prudyvus, NSC “Kharkov Institute of Physics and Technology”

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S. А. Savina, NSC “Kharkov Institute of Physics and Technology”

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A. V. Zykova, NSC “Kharkov Institute of Physics and Technology”

с.н.с.

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