Jpn. J. Appl. Phys. 26 (1987) pp. 1983-1987  |Next Article|  |Table of Contents|
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Structural Studies on the ZrO₂–Y₂O₃ System by Electron Diffraction and Electron Microscopy III

Susumu Suzuki, Michiyoshi Tanaka and Mareo Ishigame¹

(Received July 30, 1987; accepted for publication September 24, 1987)

The oxygen-ion displacements in modulated structures for 10–50 mol% Y₂O₃–ZrO₂ can be assigned in terms of the frozen in distortions of the molecular vibrational modes of an oxygen ion cube. This assignment clarifies that the displacement of the 10 mol% Y₂O₃–ZrO₂ structure type (a deformed fluorite structure) decreases and that of the Y₂O₃ structure type increases as the amount of Y₂O₃ increases. The displacement of the Y₂O₃ type already occupies 75% in 20 mol% Y₂O₃–ZrO₂ and 97% in 50 mol% Y₂O₃–ZrO₂ in the microdomains of modulated structures. The decrease of the ionic conductivity with the content of Y₂O₃ can be attributed to an increase in the volume of microdomains with the Y₂O₃-type displacement. The arc-shaped diffuse scattering observed in 20 and 40 mol% Y₂O₃–ZrO₂ originates from the presence of various orientations and different intervals of the periodic antiphase boundaries.

URL: http://jjap.jsap.jp/link?JJAP/26/1983/
DOI: 10.1143/JJAP.26.1983

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