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Description:

To enhance the conductivity of La3+, the (402) plane aligned polycrystalline La4Ga2O9 (space group P21/c) was prepared by sintering at 1673 K for 2 h after colloidal processing under a high magnetic field. The (402) plane normal of each constituent crystal grain of the polycrystal was found to be almost parallel to the applied magnetic field. The texture fraction of (402), expressed as the Lotgering factor, was 0.235. A comparison was made of the conductivities parallel (σ∥) and perpendicular (σ⊥) to the aligned plane normal. The σ∥, ranging from 1.63 × 10−7 S cm−1 at 623 K to 8.52 × 10−4 S cm−1 at 1073 K, demonstrated the highest value at each temperature, followed by σr and σ⊥ in that order. Since the a-axis is almost parallel to the (402) plane normal, the enhanced La conductivity of the La4Ga2O9 polycrystal has confirmed, for the first time, the prediction by the bond valence energy landscape method in the literature that La conduction is preferential along the a-axis.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Lanthanum ion conductor, Grain alignment, Anisotropy, Impedance spectroscopy

Date published: 2025-11-01

Publisher: Ceramic Society of Japan

Journal:

• Journal of the Ceramic Society of Japan (ISSN: 13486535) vol. 133 issue. 11 p. 657-662 25106

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2109/jcersj2.25106

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Updated at: 2025-12-15 10:27:31 +0900

Published on MDR: 2025-12-18 19:08:26 +0900