A relation between long-range correlation and dielectric anomaly  

作　　者：张磊 钟维烈 王春雷 彭毅萍 

出　　处：《Science China Mathematics》1999年第4期423-428,共6页中国科学：数学（英文版）

基　　金：Project supported by the Climbing Program of Foundamental Research of China

摘　　要：A double-well potential model is established to explain the dielectric anomaly of ferroelectrics. The dielectric constant consists of two parts. One part is independent of the long-range correlation, following 1/T law. The other part originates from the long-range correlation, and can be described by the correlation length well. The deviation from Curie-Weiss law in a small size sample originates from the decrease of the long-range correlation.A double-well potential model is established to explain the dielectric anomaly of ferroelectrics. The dielectric constant consists of two parts. One part is independent of the long-range correlation, following 1/T law. The other part originates from the long-range correlation, and can be described by the correlation length well. The deviation from Curie-Weiss law in a small size sample originates from the decrease of the long-range correlation.

关 键 词：FERROELECTRICS MULTI-SITE potential DIELECTRIC ANOMALY LONG-RANGE correlation. 

分 类 号：O482.4[理学—固体物理]