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Structural, dielectric and electrical properties of lithium silicate ceramics: a comparative study

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Abstract

Lithium silicate (LS) ceramics were prepared via a solid-state reaction technique. Two ceramics with different molar ratios of Li2CO3/SiO2 (1:1 and 1:2) were prepared for dielectric studies. X-ray diffraction pattern showed that Li2CO3/SiO2 (1:1) ceramic is obtained as single phase composition whereas Li2CO3/SiO2 (1:2) ceramic exhibit a multiphase structure with Li2SiO3 as a major phase. Microstructural analysis shows that the compounds have well defined grains separated by grain boundaries. Dielectric and electrical properties of the samples were studied in a wide temperature (30–400 °C) and frequency ranges (100 Hz–5 MHz). From the dielectric studies, we can prescribe Li2CO3/SiO2 (1:2) ceramic as a good dielectric material since it possesses low dielectric loss. Detailed analysis of the impedance data suggests that the conduction of Li2CO3/SiO2 (1:2) ceramic is mainly due to the bulk effects whereas the complex impedance plots of Li2CO3/SiO2 (1:1) ceramic suggests the presence of both bulk as well as grain boundary contributions. The bulk resistance of the samples has been observed to decrease with rise in temperature showing a typical negative temperature coefficient of resistance behavior. The low activation energies of the samples suggest the presence of singly ionized oxygen vacancies in the conduction process.

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Authors and Affiliations

  1. Department of Applied Physics, Indian School of Mines, Dhanbad, 826004, India

    Abhijit Prasad & Amitabha Basu

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  1. Abhijit Prasad
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  2. Amitabha Basu
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Correspondence to Abhijit Prasad.

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Prasad, A., Basu, A. Structural, dielectric and electrical properties of lithium silicate ceramics: a comparative study. J Mater Sci: Mater Electron 24, 1855–1862 (2013). https://doi.org/10.1007/s10854-012-1023-z

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  • DOI: https://doi.org/10.1007/s10854-012-1023-z

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