期刊
ACTA MATERIALIA
卷 179, 期 -, 页码 255-261出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.08.038
关键词
Sodium niobate; Ceramics; Phase transitions; Dielectric measurements; Grain size
资金
- Materials Research Institute at Queen Mary University of London
- EPSRC (MASSIVE project) [EP/L017695/1]
- EPSRC (Teranet fund) [EP/M00306X/1]
- EPSRC [EP/M00306X/1, EP/L017695/1] Funding Source: UKRI
Switchable ferroelectric/antiferroelectric ceramics are of significant interest for high power energy storage applications. Grain size control of this switching is an interesting approach to controlling polarization and hence dielectric properties. However, the use of this approach in technologically relevant ceramics is hindered by difficulty in fabricating dense ceramics with small grain sizes. Here an intermediate polar ferroelectric phase (P2(1)ma) has been isolated in dense bulk sodium niobate ceramics by grain size control through spark plasma sintering methods. Our findings, supported by XRD, DSC, P-E (I-E) loops and dielectric characterization, provide evidence that the phase transition from the antiferroelectric (AFE) R-phase, in space group Pnmm, above 300 degrees C, to the AFE P-phase, in space group Pbma, at room temperature, always involves the polar intermediate P2(1)ma phase and that the P2(1)ma -> Pbma transition can be suppressed by reducing grain size. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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