Premium
Improved Dielectric and Nonlinear Electrical Properties of Fine‐Grained CaCu 3 Ti 4 O 12 Ceramics Prepared by a Glycine‐Nitrate Process
Author(s) -
Thongbai Prasit,
Yamwong Teerapon,
Maensiri Santi,
Amornkitbamrung Vittaya,
Chindaprasirt Prinya
Publication year - 2014
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/jace.12812
Subject(s) - materials science , ceramic , sintering , dielectric , microstructure , dissipation factor , grain size , calcination , mineralogy , grain growth , analytical chemistry (journal) , atmospheric temperature range , permittivity , composite material , chemistry , thermodynamics , optoelectronics , biochemistry , physics , chromatography , catalysis
Pure CaCu 3 Ti 4 O 12 was successfully prepared by a glycine‐nitrate process using a relatively low calcination temperature and short reaction time of 760°C for 4 h. Fine‐grained CaCu 3 Ti 4 O 12 ceramics with dense microstructure and small grain size were obtained after sintering for 1 h. The nonlinear coefficient of a fine‐grained CaCu 3 Ti 4 O 12 ceramic calculated in the range 1–10 mA/cm 2 was found to be very high of ~16.39 with high breakdown electric field strength of 1.46 × 10 4 V/cm. This fine‐grained CaCu 3 Ti 4 O 12 ceramic also exhibited a very low loss tangent of 0.017 at 20°C with temperature stability over the range −55°C to 85°C. The grain growth rate of the CaCu 3 Ti 4 O 12 ceramics was found to be very fast after increasing the sintering time from 1.5 to 3 h, leading to formation of a coarse‐grained CaCu 3 Ti 4 O 12 ceramic with grain size of about 100–200 μm. The dielectric permittivity of this coarse‐grained ceramic was found to be as high as 1.03 × 10 5 with a low loss tangent of 0.054.