Effect of Ga Substitution on the Improper Ferroelectric Aluminate Sodalite-Type Oxide Ca8[AlO2]12{WO4}2

Hashimoto Y, Xie L, Takaaki S, Kuwano T, Kuhfuß M, Shi X, Khansur NH, Webber KG, Deguchi K, Taniguchi H (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Book Volume: 109

Article Number: e70784

Journal Issue: 5

DOI: 10.1111/jace.70784

Abstract

This study examines the dielectric and elastic properties of aluminate sodalite-type oxides Ca8[(Al1−xGax)O2]12{WO4}2 (x = 0.00, 0.05, and 0.10) to elucidate their complex phase-transition behavior. Combined dielectric and elastic measurements reveal successive transitions from a paraelastic high-temperature phase to a ferroelastic low-temperature phase through intermediate ferroelastic phases. For x = 0.00, two intermediate phases emerge during cooling, whereas only one is observed upon heating, indicating an asymmetric transition pathway. Increasing Ga content progressively destabilizes and ultimately suppresses the intermediate phase, likely due to enhanced entropy effects. Broad dielectric and elastic anomalies observed below 500 K for x = 0.00 suggest the formation of polar nanoclusters, whose disappearance upon Ga substitution coincides with the loss of the intermediate phase. These findings have clarified composition–structure–property relationships in Ca8[(Al1−xGax)O2]12{WO4}2 and provided insights into the design of functional properties in aluminate sodalite-type oxides.

Authors with CRIS profile

Involved external institutions

Nagoya University / 名古屋大学 Japan (JP) Institute of Science Tokyo (ISCT) / 東京科学大学 Japan (JP)

How to cite

APA:

Hashimoto, Y., Xie, L., Takaaki, S., Kuwano, T., Kuhfuß, M., Shi, X.,... Taniguchi, H. (2026). Effect of Ga Substitution on the Improper Ferroelectric Aluminate Sodalite-Type Oxide Ca8[AlO2]12{WO4}2. Journal of the American Ceramic Society, 109(5). https://doi.org/10.1111/jace.70784

MLA:

Hashimoto, Yujiro, et al. "Effect of Ga Substitution on the Improper Ferroelectric Aluminate Sodalite-Type Oxide Ca8[AlO2]12{WO4}2." Journal of the American Ceramic Society 109.5 (2026).

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