期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 491, 期 1-2, 页码 372-377出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.10.187
关键词
Magnetically ordered materials; Chemical synthesis; Dielectric response; Electronic transport
资金
- University Grant Commission (UGC), New Delhi, Government of India
Mixed Ni(x)Zn(1-x)Je(2)O(4) (x = 0.1, 0.2, 0.3, 0.4 and 0.5) systems were prepared by a chemical combustion route. This method involves the addition of aqueous nickel nitrate, zinc nitrate, ferric nitrate as oxidizing agents and fuel citric acid as a reducing agent to form a homogeneous redox mixture. The product materials on calcination to 700 degrees C for 2 h produces nanocrystalline Ni-Zn ferrite with the corresponding average grain size ranging from 53 nm to 71 nm with varying composition. The room temperature magnetization measurements showed that the saturation magnetization (M-s) of Zn ferrite increases with Ni content. Temperature dependent DC resistivity measurements reveal the semiconducting behavior for all the samples. Room temperature dielectric properties viz.; relative dielectric permittivity (epsilon(r)), dielectric loss (tan delta) and AC conductivity (sigma(AC)) for all the samples were studied as a function of applied frequency in the range from 20 Hz to 1 MHz. These studies indicate that the relative dielectric permittivity for all the samples shows usual dielectric dispersion which is due to the Maxwell-Wagner type interfacial polarization. The AC conductivity measurement suggests that the conduction is due to small polaron hopping. (C) 2009 Elsevier B.V. All rights reserved.
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