期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
卷 26, 期 5, 页码 3044-3051出版社
SPRINGER
DOI: 10.1007/s10854-015-2795-8
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资金
- National Science Foundation of China (NSFC) [51172136, 51107077]
- Fundamental Research Funds for the Central Universities [GK201301002, GK201305013, GK201403006]
- Science and Technology Program of Shaanxi Province and Xi'an City [2013K09-26, CXY1342(4)]
CaCu3Ti4O12 (CCTO) particles were prepared separately by the sol-gel method (sg) and solid-state method (ss). CCTO-sg particles were more uniform, narrower distribution size and smaller (effective diameter of 290 nm) than that of CCTO-ss particles with the value of 480 nm for CCTO-ss particles. The CCTO-sg particles exhibited a small particle size and in turn improved chemical activity and lower crystallization temperature, which give rise to the enhanced dielectric properties. CCTO-sg and CCTO-ss filled polyvinylidene fluoride (CCTO/PVDF) were molded by solution mixing process and hot-pressing. The enhanced dielectric constant, good frequency and temperature stability of CCTO/PVDF composites were significant with increasing the volume fraction of CCTO particles. Compared to two kinds of composites, the CCTO-sg/PVDF composites exhibited better dielectric properties than CCTO-ss/PVDF composites. The dielectric constant of 50 vol% CCTO-sg/PVDF composites reached the maximum value of 62.3, which was 8 times and 2 times larger than that of pure PVDF and 50 vol% CCTO-ss/PVDF composites, respectively. The temperature coefficient (C-T-C-25 degrees C/C-25 degrees C x 100%) of CCTO-sg/PVDF composites was -3 to 10 % from -10 to 150 degrees C at 10 kHz, which was lower than that of CCTO-ss/PVDF composites. Meanwhile, the dielectric constant of CCTO/PVDF obtained by Maxwell-Garnett model and Yamada model were in close agreement with the experimental data, respectively.
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