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Phase transitions in bismuth-modified silver niobate ceramics for high power energy storage

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Abstract

Ceramics of composition Ag1−3xBixNbO3 (0.005 ≤ x ≤ 0.040) were prepared by solid state methods and their structure and electrical behavior were characterized with a view to their potential use as high power energy storage materials. All compositions exhibited an average orthorhombic non-polar structure. The low temperature phase transitions M1 ↔ M2 and M2 ↔ M3 and the freezing temperature Tf found in AgNbO3 are increasingly shifted to lower temperatures with increasing x-value. Similarly to AgNbO3, the structure of the M2 phase above Tf is antiferroelectric. In the M2 phase, below Tf it is proposed that the structure possesses local polar regions, which can expand during electrical loading within an average non-polar antiferroelectric matrix. The polar domains found in the M1 phase of AgNbO3 diminish with increasing bismuth content, as confirmed by the suppression of domain switching peaks in the current–polarization–electric field hysteresis loops. The antiferroelectric to ferroelectric electric field-induced transformation is progressively hindered, as the structure evolves towards long-range antiferroelectric order with increasing bismuth content. Moreover, up to a certain substitution level, bismuth addition is seen to enhance energy storage properties compared to unsubstituted AgNbO3, with a high energy storage density of 2.6 J cm−3 and high energy efficiency of 0.86 achieved. These values make these materials amongst the best performing energy storage lead-free ceramics currently known.

Graphical abstract: Phase transitions in bismuth-modified silver niobate ceramics for high power energy storage

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Publication details

The article was received on 03 May 2017, accepted on 30 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03821F
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Phase transitions in bismuth-modified silver niobate ceramics for high power energy storage

    Y. Tian, L. Jin, H. Zhang, Z. Xu, X. Wei, G. Viola, I. Abrahams and H. Yan, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA03821F

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