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Enhancement of Giant Dielectric Response in CaCu 3 Ti 4 O 12 Ceramics by Zn Substitution
Author(s) -
Ni Lei,
Chen Xiang Ming
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03384.x
Subject(s) - dielectric , materials science , sintering , ceramic , microstructure , mineralogy , analytical chemistry (journal) , phase (matter) , metallurgy , chemistry , optoelectronics , organic chemistry , chromatography
Zn‐substituted CaCu 3 Ti 4 O 12 ceramics were synthesized by solid‐state sintering. Their microstructures and dielectric properties were investigated. Ca(Cu 1− x Zn x ) 3 Ti 4 O 12 single‐phase structures were obtained up to x =0.1, and the Cu + /Cu 2+ and Ti 3+ /Ti 4+ mixed‐valent structure was enhanced with increasing Zn substitution. The giant dielectric response was significantly enhanced by Zn substitution. The dielectric constant increased with increasing x , and a giant dielectric constant plateau as high as ∼9 × 10 4 was achieved for x =0.1 at 10 kHz, while that for x =0 was ∼3 × 10 4 . The enhanced giant dielectric response was profoundly concerned with the modified mixed‐valent structure.