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Dielectric properties of iron doped calcium copper titanate, CaCu2.9Fe0.1Ti4O12 |
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| Authors: | Alok Kumar RaiNitish Kumar Singh Sang-Kwon LeeKD Mandal D KumarOm Parkash |
| Affiliation: | a Department of Semiconductor Science and Technology, SPRC, Chonbuk National University, Jeonju 561-756, Republic of Korea b Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi 221005, U.P., India c Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221005, U.P., India |
| Abstract: | 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 (?) 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 ?. 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. |
| Keywords: | Ceramics Chemical synthesis Dielectric response Grain boundaries X-ray diffraction |
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