Phenomenological Theory of High Permittivity in Fine‐Grained Barium Titanate
作者:
W. R. BUESSEM,
L. E. CROSS,
A. K. GOSWAMI,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1966)
卷期:
Volume 49,
issue 1
页码: 33-36
ISSN:0002-7820
年代: 1966
DOI:10.1111/j.1151-2916.1966.tb13144.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
The anomalously high permittivity in fine‐grained ceramic barium titanate is explained by the absence of 90° twinning within the grains, giving rise to internal stresses as the ceramic cools below the Curie temperature. Using the Devonshire phenomenological thermodynamic method and a simplified model, the stresses involved are calculated. At these stress levels, the reduced strain calculated on this model agrees well with X‐ray data for the fine‐grained material. The limitations and possible developments of the proposed model are dis
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