THE DIELECTRIC-RELAXATION OF LEAD MAGNESIUM NIOBATE RELAXOR FERROELECTRICS

被引：141
|
作者：
VIEHLAND, D [1 ]
JANG, S [1 ]
CROSS, LE [1 ]
WUTTIG, M [1 ]
机构：
[1] UNIV MARYLAND,DEPT MAT & NUCL ENGN,COLLEGE PK,MD 20742
来源：
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES | 1991年 / 64卷 / 03期
关键词：
D O I：
10.1080/13642819108207624
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dielectric spectroscopy of lead magnesium niobate relaxor ferroelectrics has been investigated over the frequency range of 10(2) to 10(7) Hz. The imaginary component was found to become nearly frequency independent below a freezing temperature, and scaled to a phenomenological equation involving the Vogel-Fulcher relationship. The absorption and Cole-Cole plots were found to become very broad near this freezing temperatue. The relaxation time distribution was subsequently calculated by analogy to spin and dipolar glasses. A strong broadening of the distribution was found in the vicinity of the freezing temperature. It is proposed that this deviation from Debye behavior is a result of the development of correlations between polar moments leading to the onset of nonergodicity near freezing.
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页码：335 / 344
页数：10
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