Colossal dielectric behavior and dielectric anomalies in Sr2TiCrO6 ceramics
| Autor: | Hong Bi, Jie Sun, Jiayu Wang, Y. M. Xie, Rida Ahmed, S. A. Suhaib, Chunchang Wang, Guojing Wang, Shuting Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Condensed matter physics 020502 materials Mechanical Engineering 02 engineering and technology Dielectric Condensed Matter::Materials Science Dipole 0205 materials engineering Mechanics of Materials visual_art visual_art.visual_art_medium Relaxation (physics) General Materials Science Dipolar relaxation Ceramic Sensitivity (control systems) Anomaly (physics) Negative impedance converter |
| Zdroj: | Journal of Materials Science. 54:6323-6331 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-018-03298-3 |
| Popis: | Sr2TiCrO6 ceramic samples were prepared via solid-state method, and their dielectric properties were systematically investigated. Colossal dielectric behavior was found to occur near room temperature, and two dielectric anomalies were observed around 620 and 820 K. The colossal dielectric behavior follows the dual-relaxation mechanism, which is composed of a dipolar relaxation associated with the defect dipole pairs of $$ {\text{OH}}_{\text{O}}^{ \cdot } $$ –Cr3+ and a Maxwell–Wagner relaxation due to the surface-layer effect originated from humidity sensitivity. The low-temperature anomaly is considered to be a pseudo-relaxor behavior caused by oxygen vacancies, and the high-temperature anomaly results from negative capacitance due to the carriers changing from localized state to free state. |
| Databáze: | OpenAIRE |
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