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Nano-Li-ferrites; sol–gel technique; X-ray diffraction; dielectric constant; tan $\delta$.

Pure and doped nano-Li-ferrite spinels were prepared by the sol–gel auto-combustion technique. The prepared ferrites were pelleted and heat treated at different temperatures. Structural characterization was carried out on the as-prepared samples and also on the heat-treated samples using X-ray diffraction (XRD). The studies confirmed the formation of single phase with spinel structures in all the samples. The crystallite size of the samples evaluated from XRD data was found to be 17–24 nm. Scanning electron microscopic photomicrographs revealed the microstructures and the grain size of these nanoferrites. The room-temperature dielectric constant and dielectric loss tangent, tan δ were measured as a function of frequency in the range 100 Hz–1 MHz. These nanoferrites showed the normal dielectric dispersion behaviour. The observed dielectric constant and dielectric loss tangent were found to be much lower than those measured on substituted Li-ferrites prepared by the conventional ceramic method. The results obtained were discussed in the paper.

Mamata Maisnam¹ Nandeibam Nilima² Maisnam Victory² Sumitra Phanjoubam²

1. Department of Basic Sciences and Humanities, National Institute of Technology Manipur, Langol 795 004, India
2. Department of Physics, Manipur University, Canchipur 795 003, India

Published

February 2016

Manuscript received

8 February 2015

Accepted

27 August 2005