Dielectric Properties of (CaCu3Ti4O12)1-x(Fe3O4)x
Date Issued
2007
Date
2007
Author(s)
Lu, Zhao-Ming
DOI
en-US
Abstract
The dielectric properties of (CaCu3Ti4O12)1-x(Fe3O4)x (x = 0.01, 0.05, 0.1, 0.2, 0.3 and 0.4) have been studied, only 1% mixing of Fe3O4 dramatically quenches the huge of 104 down to 65 over the measured temperature range from 15 K to 300 K. At low T, CaCu3Ti4O12 (CCTO) transforms into an antiferromagnetic phase at TN = 25 K. The dielectric constant of (CaCu3Ti4O12)1-x(Fe3O4)x (x = 0.01, 0.05, 0.1, 0.2 and 0.3) shows sharp decrease below TN, providing possible coupling between the polarization and magnetization.
In addition, the (CCTO)0.95(Fe3O4)0.05 and (CCTO)0.9(Fe3O4)0.1 ceramics have also shown diffuse phase transition (DPT), which is a typical feature of relaxor ferroelectrics. The modified Curie–Weiss law and Santos-Eiras equation were applied to (CCTO)0.95(Fe3O4)0.05 and (CCTO)0.9(Fe3O4)0.1 ceramics in order to investigate the nature of polarization mechanism. Furthermore, physical parameters such as static freezing temperature TVF fitted by the Vogel–Fulcher relationship, indicated the relaxor nature of these two ceramics.
Subjects
鈣銅鈦氧
弛緩體
high dielectric constant
CaCu3Ti4O12
relaxor
Type
thesis
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