Measurement of cationic diffusivity through Er2O3/Y2O3 interdiffusion under AC-flash event

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-05-15 DOI:10.1016/j.jeurceramsoc.2025.117540

Ying Yang , Hiroshi Masuda , Fei Shen Ong , Hidehiro Yoshida

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Abstract

The diffusivity of Er cations in Y₂O₃ was directly investigated using Er₂O₃/Y₂O₃ interdiffusion couples under alternating current (AC) flash events. Specimen temperatures during the AC-flash events were determined by a combination of direct thermographic measurement and numerical simulations. Compared to conventional heat treatment without electric field, the diffusion of the Er cations proceeded more than 30 times faster in the AC-flash treatment at a specimen temperature of about 1700℃. This indicates that the cationic interdiffusion was athermally promoted by the AC electric field. Eventually, both the lattice and grain boundary diffusivities were 2–3 orders of magnitude greater under the AC-flash events than without the electric field at the specimen temperatures of 1550℃–1880℃. Grain growth and grain boundary migration associated with significant grain boundary bowing-out were also enhanced with the increasing current density.

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交流闪蒸条件下Er2O3/Y2O3互扩散法测定阳离子扩散率

采用Er2O3/Y2O3互扩散偶对，直接研究了Er2O3在Y2O3中的扩散率。通过直接热像测量和数值模拟相结合的方法确定了交流闪蒸过程中的试样温度。与常规无电场热处理相比，在1700℃左右的样品温度下，交流闪蒸处理的Er阳离子的扩散速度快了30倍以上。说明在交流电场的作用下，阳离子的相互扩散是热促进的。结果表明，在1550℃~ 1880℃的试样温度下，在交流闪变作用下，晶体的晶格和晶界扩散系数均比无电场作用时提高了2 ~ 3个数量级。随着电流密度的增加，晶粒的生长和晶界迁移（伴有明显的晶界弯曲）也得到增强。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.