Ferroelectric-to-non-ergodic relaxor phase transition of (Bi0.5Na0.3K0.2) TiO3– (Ba0.8Ca0.2) TiO3 lead-free ceramics by SrTiO3 effect
| Autor: | O. M. Hemeda, M. Fangary, M. M. Nassary, Abd El-razek Mahmoud |
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| Rok vydání: | 2021 |
| Předmět: |
Permittivity
Phase transition Materials science Condensed matter physics Dielectric Crystal structure Coercivity Condensed Matter Physics Ferroelectricity Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Tetragonal crystal system Phase (matter) Electrical and Electronic Engineering |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 32:27625-27635 |
| ISSN: | 1573-482X 0957-4522 |
| Popis: | In this work, a series compositions of [(0.95−x)(Bi0.5Na0.3K0.2)TiO3–xSrTiO3–0.05(Ba0.8Ca0.2) TiO3] Pb-free ceramics (0.0 ≤ x ≤ 0.2) abbreviation (BKNT–ST–BCT) were synthesized by conventional sintering method. Effect of ST addition on the crystal structure, domain structure, dielectric and ferroelectric properties were investigated. The crystal structure was monitored by XRD and the patterns shown phase crossover from tetragonal to pseudo-cubic caused by lower crystal symmetry of lattice effect at high content of ST. Morphology of sintered ceramics were characterized by SEM, while the domain structure of ST = 0.0 at different temperatures was examined by In situ TEM. Diffused phase transition corresponding to ferroelectric to ergodic relaxor at lower T has been observed at depolarization temperature (Td) at (ST |
| Databáze: | OpenAIRE |
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