Synthesis and crystal structure of pyrochlore-type silver niobate and tantalate

Isuru WITHANAGE; Nobuhiro KUMADA; Takahiro TAKEI; Sayaka YANAGIDA; Yoshihiro KUROIWA; Chikako MORIYOSHI

doi:10.2109/jcersj2.17063

Feature: The 55th Symposium on Basic Science of Ceramics: Notes

Synthesis and crystal structure of pyrochlore-type silver niobate and tantalate

Isuru WITHANAGE, Nobuhiro KUMADA, Takahiro TAKEI, Sayaka YANAGIDA, Yoshihiro KUROIWA, Chikako MORIYOSHI

著者情報

キーワード: Hydrothermal reaction, Ion-exchange reaction, Photocatalytic, Crystal Structure

ジャーナルフリー

2017 年 125 巻 10 号 p. 776-778

DOI https://doi.org/10.2109/jcersj2.17063

詳細

抄録

Pyrochlore-type (K_0.73H_0.27)NbO₃·1.72H₂O and (K_0.56H_0.44)TaO₃·1.14H₂O were synthesized by a hydrothermal reaction. The K⁺ ions in these compounds were reacted with Ag⁺ ions in excess molten AgNO₃ at 300°C. This reaction produced fluorite-type Ag_0.41Nb_0.59O_1.68 and pyrochlore-type Ag_0.93TaO_2.97·0.94H₂O. Their crystal structures were refined by the Rietveld method using synchrotron X-ray powder diffraction data. Only the pyrochlore-type Ag_0.93TaO_2.97·0.94H₂O exhibited photocatalytic activity toward phenol degradation under UV light irradiation.

責任著者(Corresponding author)

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