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Journal of Materials Science

, Volume 54, Issue 8, pp 6323–6331 | Cite as

Colossal dielectric behavior and dielectric anomalies in Sr2TiCrO6 ceramics

  • J. Sun
  • R. Ahmed
  • G. J. Wang
  • S. T. Wang
  • J. Wang
  • S. A. Suhaib
  • Y. M. Xie
  • H. Bi
  • C. C. WangEmail author
Electronic materials
  • 84 Downloads

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 \( {\text{OH}}_{\text{O}}^{ \cdot } \)–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.

Notes

Acknowledgements

The authors thank financial support from National Natural Science Foundation of China (Grant Nos. 51572001, 51872001).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratory of Dielectric Functional Materials, School of Physics and Material ScienceAnhui UniversityHefeiChina
  2. 2.College of Chemistry and Chemical EngineeringAnhui UniversityHefeiChina

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