Highly Tetravalent Hafnium Ion Conducting Solids with a NASICON-Type Structure
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概要
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Tetravalent Hf4+ ion conducting solid electrolytes, Hf1−x/4(Nb1−yWy)5/(5+y)P3−xWxO12, were developed by partially replacing both the Nb5+ and P5+ sites in the NASICON-type HfNb(PO4)3 solid simultaneously with higher valence W6+ ions. Among the samples prepared, the highest conductivity was obtained for the Hf3.85/4(Nb0.8W0.2)5/5.2P2.85W0.15O12 (y = 0.2; x = 0.15) solid, which contains a high amount of W6+ ions and holds the optimum lattice volume for Hf4+ ion conduction, enabling a significant reduction of the electrostatic interaction between the Hf4+ cation and the O2− anions in the solid. The conducting species in the Hf3.85/4(Nb0.8W0.2)5/5.2P2.85W0.15O12 solid was directly demonstrated to be the Hf4+ ion via DC electrolysis.
著者
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NUNOTANI Naoyoshi
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Nunotani Naoyoshi
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Tamura Shinji
Department Of Applied Chemistry Faculty Of Engineering And Handai Frontier Research Center Osaka Uni
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Imanaka Nobuhito
Department Of Applied Chemistry Faculty Of Engineering
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