Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 36, Pages 8901-8906Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.06.008
Keywords
Ceramics; Chemical synthesis; Dielectric response; Grain boundaries; X-ray diffraction
Categories
Funding
- C. S. I. R, New Delhi
- Priority Research Center
- Ministry of Education, Science and Technology (MEST) of the Korean government [2009-0094032, 2010-0019694]
- NRF
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CaCu2.9Fe0.1Ti4O12 (CCFTO) has been prepared by a novel semi-wet route and its dielectric properties have been studied in the temperature range 300-500 K. It is found that dielectric constant (epsilon) decreases drastically in the frequency range 100 Hz to 1 MHz. Complex plane impedance and modulus analysis was done to understand this drastic decrease in epsilon. Oxidation state of various ions was studied using X-ray photoelectron spectroscopy (XPS). The decrease in the permittivity of CCFTO can be attributed to two factors: the suppression of the Ca/Cu disorder in CCFTO which is observed in CaCu3Ti4O12 (CCTO) and the absence of the grain boundary internal barrier layer capacitance mechanism. (C) 2011 Elsevier B. V. All rights reserved.
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