Probing point defects inBa(B1/3B'2/3)O3 by ESR, PAS and dielectric spectroscopy
| Autor: | Kolodiazhnyi T., Annino G., Younker A., Malysz P., Mascher P., Haneda H. |
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| Rok vydání: | 2006 |
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| Zdroj: | Journal of the European Ceramic Society 26 (2006): 1921–1924. info:cnr-pdr/source/autori:Kolodiazhnyi T., Annino G., Younker A., Malysz P., Mascher P., Haneda H./titolo:Probing point defects inBa(B1%2F3B''2%2F3)O3 by ESR, PAS and dielectric spectroscopy/doi:/rivista:Journal of the European Ceramic Society/anno:2006/pagina_da:1921/pagina_a:1924/intervallo_pagine:1921–1924/volume:26 |
| Popis: | In contrast to simple ternary perovskites (e.g., SrTiO3 and BaTiO3), the defect chemistry model of complex barium perovskites with general formula Ba(B'1/3B''2/3)O3 has yet to be developed. In an attempt to gain an insight into a point defect chemistry of these compounds, we present first results of electron spin resonance, positron annihilation spectroscopy and dielectric spectroscopy (10-100 GHz) of Ba(B'1/3B''2/3)O3, where B'= Mg, Zn, Ni, Co and B''=Nb and Ta. Both extrinsic and intrinsic defects were found in these materials. A Mn ion impurity serves as an excellent sensor for the early stages of the B-site cation disorder and oxygen activity. Based on the several Ba(B'1/3B''2/3)O3 examples, we demonstrate that Schottky disorder plays a crucial role in the high temperature phase stability and dielectric loss of Ba(B'1/3B''2/3)O3 perovskites. |
| Databáze: | OpenAIRE |
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