Transmission electron microscopic study of tungstic acid H2W2O7 derived from an Aurivillius phase Bi2W2O9 by acid treatment

Fumi Nakasone; Manabu Kudo; Hajime Ohkawa; Wataru Sugimoto; Nobuhiro Kumada; Zheng Liu; Osamu Terasaki; Yoshiyuki Sugahara

doi:10.14853/pcersj.2003S.0.502.0

Preprints of Annual Meeting of The Ceramic Society of Japan, 2003

Session ID : 2I32

DOI https://doi.org/10.14853/pcersj.2003S.0.502.0

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Host: The Ceramic Society of Japan

Transmission electron microscopic study of tungstic acid H2W2O7 derived from an Aurivillius phase Bi2W2O9 by acid treatment

*Fumi Nakasone, Manabu Kudo, Hajime Ohkawa, Wataru Sugimoto, Nobuhiro Kumada, Zheng Liu, Osamu Terasaki, Yoshiyuki Sugahara

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Abstract

The layered tungstic acid H₂W₂O₇ was prepared through selective leaching of bismuth oxide sheets from an Aurivillius phase, Bi₂W₂O₉. The transmission electron microscopic (TEM) images along [001] indicate ReO3-like slabs were maintained after leaching of bismuth oxide sheets. The layers consist of double octahedral sheets, consistent with Bi₂W₂O₉ structure. The arrangement of WO₆ octahedra, however, slightly changed after acid treatment, leading to the contraction along a and b axes.

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