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Dielectric and Pyroelectric Properties of Bismuth Layer Type Ceramics

Wang Xiaoli Yao Xi (Xian Jiaotong University,710049)  
Bismuth layer type ceramics Bi_2BaNb_2O_9(BBN),Bi_2LaNbTiO_9(BLNT)and Bi_2LaTaTiO_9(BLTT)all show broad maxima of dielectric constant and an increase in Curie temperature withincreasing frequency characteristic.On the basis of analyses in the dielectric and pyroelectricproperties,the reasons of relaxation in BBN,BLNT and BLTT ceramics are discussed.
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