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Ferroelectric transitions in silver niobate ceramics

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Abstract

Silver niobate (AgNbO3)-based dielectric materials show great application potential in pulse power energy storage systems due to their high energy storage density. However, a fundamental understanding of this important lead-free system has remained controversial ever since its discovery in 1958. In the present study, a comprehensive investigation was performed via analyzing the chemical structure and physical properties of AgNbO3-based dielectric materials. The results confirm that the dielectric anomalous behavior occurring at ∼170 °C, which has been considered as the freezing temperature/transition of the antipolar dipoles (Tf) in early publications, actually originates from a phase transition between the non-centrosymmetric weakly polar and centrosymmetric non-polar phases. Moreover, the weakly polar phase exhibiting antipolar ordered behavior is proposed to be ferrielectric and is responsible for the strong field-induced double-like polarization hysteresis. The dielectric relaxor behavior at ∼70 °C, which was attributed to the M1 ↔ M2 transition in early studies, was further demonstrated to be intimately correlated with the presence of local ferroelectric-type polar domains in a weakly polar/ferrielectric phase. The observed weak remnant polarization within double-like polarization hysteresis under strong field cycles is proposed to mainly originate from the polarization contributed by the residual strong field-induced ferroelectric phase.

Graphical abstract: Ferroelectric transitions in silver niobate ceramics

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Publication details

The article was received on 30 Oct 2018, accepted on 09 Dec 2018 and first published on 11 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC05451G
Citation: J. Mater. Chem. C, 2019, Advance Article
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    Ferroelectric transitions in silver niobate ceramics

    Y. Tian, J. Li, Q. Hu, L. Jin, K. Yu, J. Li, E. D. Politova, S. Yu. Stefanovich, Z. Xu and X. Wei, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC05451G

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