Conductivity relaxation and oxygen vacancies-related electron hopping mechanism in Pb1-xLax/2Smx/2Ti1-xFexO3solid solutions
| Autor: | Rachna Selvamani, A.K. Karnal, Mandeep Singh, Anupinder Singh, Randeep Kaur, Vandana Sharma, Vidya Sagar Tiwari, Surya M. Gupta |
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| Rok vydání: | 2018 |
| Předmět: |
Ceramics
Materials science Solid-state reaction route Clay industries. Ceramics. Glass chemistry.chemical_element 02 engineering and technology complex impedance spectroscopy Conductivity 01 natural sciences Oxygen Electron hopping 0103 physical sciences Ceramic 010302 applied physics 021001 nanoscience & nanotechnology ac conductivity TP785-869 chemistry visual_art Ceramics and Composites visual_art.visual_art_medium Relaxation (physics) Physical chemistry Crystallite 0210 nano-technology Solid solution |
| Zdroj: | Journal of Asian Ceramic Societies, Vol 6, Iss 3, Pp 222-231 (2018) |
| ISSN: | 2187-0764 |
| DOI: | 10.1080/21870764.2018.1489941 |
| Popis: | Polycrystalline samples of Pb1-xLax/2Smx/2Ti1-xFexO3 (x = 0.20 and 0.30) have been prepared by solid state reaction route. The electrical properties of synthesized samples have been investigated using complex impedance spectroscopy as a function of frequency (100 Hz–1 MHz) within the temperature range of (448–573 K). The fitting of the Nyquist plots reveals that both grain and grain boundary contribute to relaxation and the grain boundaries are more resistive and capacitive than the grains. Modulus analysis shows that relaxation in both the samples is of non-Debye type and temperature independent. The Jonscher`s power law fit to the ac conductivity data confirms that the conduction in the prepared samples is due to the hopping of charge carriers. Long range conductivity type of relaxation is found in both the samples. |
| Databáze: | OpenAIRE |
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