Origin of relaxor behavior in 0.78(Na 0.5 Bi 0.5 )TiO 3 -0.2SrTiO 3 -0.02BaTiO 3 ceramic: An electrical modulus study
| Autor: | Dibyaranjan Rout, V. Subramanian, S. Praharaj, Suk-Joong L. Kang |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Arrhenius equation Materials science Ternary numeral system Condensed matter physics Mechanical Engineering Relaxation (NMR) Modulus 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Spectral line Dielectric spectroscopy symbols.namesake Mechanics of Materials 0103 physical sciences symbols General Materials Science 0210 nano-technology Scaling |
| Zdroj: | Materials Research Bulletin. 106:459-464 |
| ISSN: | 0025-5408 |
| Popis: | The relaxation dynamics of the polar nano-regions (PNRs) in the 0.78Na0.5Bi0.5TiO3-0.2SrTiO3-0.02BaTiO3 lead free ternary system over a wide temperature range (50–650 °C) is investigated using complex electric modulus formalism. The modulus spectra are analyzed across three characteristic temperatures TB, Tm, and Tf with a special focus on the evolution of dynamics of PNRs. Portraying high capacitance of shoulder response as compared to the bulk response in M"(f) spectra shows indirectly the presence of highly polarisable entities that persist even above TB and below Tf. The activation energies extracted from an Arrhenius fit to the relaxation time of both bulk and shoulder response signify different relaxation mechanisms. Further, the value of the stretched exponent β and the scaling behavior study of the M"(f) spectra envisage temperature sensitive dipolar relaxation. |
| Databáze: | OpenAIRE |
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