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Colossal dielectric behavior and dielectric anomalies in Sr2TiCrO6 ceramics

Author:
Sun, J., Ahmed, R., Wang, G. J., Wang, S. T., Wang, J., Suhaib, S. A., Xie, Y. M., Bi, H., Wang, C. C.
Source:
Journal of materials science 2019 v.54 no.8 pp. 6323-6331
ISSN:
0022-2461
Subject:
ambient temperature, capacitance, ceramics, dielectric properties, humidity, oxygen
Abstract:
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 [Formula: see text]–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.
Agid:
6296785