期刊
CERAMICS INTERNATIONAL
卷 40, 期 7, 页码 10073-10083出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.04.001
关键词
Dielectric properties; Perovskite; Nano-structures; Nano-composites
资金
- National Research Foundation [NRF-2010-0021835]
- Priority Research Centers Program of Republic of Korea - Ministry of Education in the Korea Government [NRF-2009-0093818]
- IT R&D program of KEIT of Republic of Korea - Ministry of Trade, Industry & Energy in the Korea Government [10039155]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10039155] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A nano-composite electro-ceramic with the chemical formula 0.5BaTiO(3) center dot 0.5CaCu(3)Ti(4)O(12) (BTO-CCTO) has been synthesized by a glycine-assisted nitrate-gel route which is simpler and faster at relatively low temperature than the conventional solid-state synthesis method. X-ray diffraction (XRD) analysis showed the existence of BTO as a secondary phase alongside the major phase of CCTO. Transmission electron microscope (TEM) analysis of the composite shows that nano-particles (60 +/- 15 urn) were obtained. Further, scanning electron microscope (SEM) images show that the morphology consists of a few large grains of CCTO (similar to 1-5 mu m) embedded in small grains of BTO (similar to 500 nm-1 mu m) with a bimodal distribution. The impedance analysis shows two major contributions associated with the grains and the grain boundaries. Modulus analysis of this composite confirmed the presence of a Maxwell-Wagner type relaxation, which is temperature dependent The activation energy value was found to be 0.80 eV, and this composite is electrically conductive due to the mobility of the ionized oxygen defects. (c) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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