Effect of thermal history on structural, microstructural properties and J – E characteristics of CaCu3Ti4O12 polycrystalline ceramic
| Autor: | Sudhish Kumar, S. N. Dolia, N.H. Vasoya, J.A. Bhalodia, P. Y. Raval, P.R. Pansara, A.R. Makadiya, Kunal B. Modi, Prashant Sharma |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Quenching Materials science Condensed matter physics Rietveld refinement Varistor 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Condensed Matter::Materials Science visual_art 0103 physical sciences visual_art.visual_art_medium Rectangular potential barrier General Materials Science Grain boundary Crystallite Ceramic 0210 nano-technology |
| Zdroj: | Materials Chemistry and Physics. 212:343-350 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2018.03.041 |
| Popis: | We report, the effect of heat treatments slow cooling, rapid thermal cooling (quenching) and microwave-assisted heating, on structural, microstructural and J – E characteristics of CaCu3Ti4O12 polycrystalline ceramic. Rietveld refinement of X-ray data confirms the emergence of the mono-phasic cubic perovskite structure, diffraction line broadening and change in the relative intensity of diffraction peaks while scanning electron microscopy revealed completely different grain morphology. The observed modifications have been discussed in detail. The strong nonlinear J – E characteristics over the wide temperature range (300–823 K) indicated the existence of a Schottky-type electrostatic potential barrier at the grain boundaries. The parameters, nonlinear coefficient, threshold electric field, potential barrier height suggest suitability of the materials for low voltage varistor applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect