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Description:

To investigate the anisotropy of Ca2+ conduction, the b-axis-aligned CaAl4O7 (space group C2/c) polycrystal was prepared by colloidal processing under high magnetic field of 12T followed by sintering at 1773K for 2 h. The texture fraction of {0k0}, expressed as the Lotgering factor f0k0, was 0.63. The c101a directions of individual crystal grains were randomly distributed around the grain-alignment direction of the polycrystal. The conductivities perpendicular (σ⊥) and parallel (σ//) to the grain alignment direction were compared with the conductivity (σrandom) of random grain oriented polycrystal between 773 and 1073 K. The σ⊥ ranging from 3.09 x 10^17 to 1.80x10^15 Scm^-1, showed the highest value at each temperature, followed by σrandom and σ// in that order. The results have confirmed for the first time the anisotropy of Ca2+ conduction and strongly supported the preferential conduction in the <101> direction predicted in the literature by the bond valence method.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Calcium ion conductor, Grossite, Grain alignment, Anisotropy, Impedance spectroscopy

Date published: 2024-07-01

Publisher: Ceramic Society of Japan

Journal:

• Journal of the Ceramic Society of Japan (ISSN: 13486535) vol. 132 issue. 7 24026

Funding:

• JSPS 19K22051 (多価陽イオン伝導性一軸配向多結晶体の材料設計と開発)

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

MDR DOI:

First published URL: https://doi.org/10.2109/jcersj2.24026

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Updated at: 2024-11-13 12:30:33 +0900

Published on MDR: 2024-11-13 12:30:33 +0900