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Synthesis, Cu incorporation, and deposition behavior of apatite-type La x Ca10−x (PO4)6−x (SiO4) x Cu y O z

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Abstract

Cu-containing, apatite-type phosphate–silicate solid solutions, La x Ca10−x (PO4)6−x (SiO4) x Cu y O z (x = 3, 5, and 6), were synthesized by an impregnating method into the channels of apatite-type lattice by heat treatment after Cu loading. The unit cell volume of the apatite increased with increasing amount of Cu, y = 0–0.6 for x = 3 and 6, indicating successful incorporation of Cu into the channels of the apatite lattice. The result of Rietveld analysis of a La5Ca5(PO4)(SiO4)5Cu y O z (x = 5) sample indicated that the distribution of La3+ and Ca2+ cations in both 4f and 6 h sites were maintained during Cu incorporation. X-ray photoelectron spectroscopy and thermogravimetric analyses revealed that oxidation and reduction of Cu species occurred during heating up to 1100 °C and cooling in air, respectively. In addition, high-temperature X-ray diffraction analysis of the La3Ca7(PO4)3(SiO4)3Cu0.6O z (x = 3) sample in the temperature range from 500 to 1100 °C revealed that reversible incorporation/deposition of Cu occurred, accompanied by Cu oxidation/reduction.

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Acknowledgements

This work was supported in part by a Grant-in-Aid for Scientific Research (No. 26340056) from the Japan Society for the Promotion of Science.

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  1. Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegatagakuen-machi, Akita, 010-8502, Japan

    Sumio Kato, Tomoyuki Endo & Masataka Ogasawara

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  1. Sumio Kato
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  2. Tomoyuki Endo
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  3. Masataka Ogasawara
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Correspondence to Sumio Kato.

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Kato, S., Endo, T. & Ogasawara, M. Synthesis, Cu incorporation, and deposition behavior of apatite-type La x Ca10−x (PO4)6−x (SiO4) x Cu y O z . J Mater Sci 51, 6509–6516 (2016). https://doi.org/10.1007/s10853-016-9960-1

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  • DOI: https://doi.org/10.1007/s10853-016-9960-1

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