Article ID Journal Published Year Pages File Type
1606928 Journal of Alloys and Compounds 2016 7 Pages PDF
Abstract

•BiFeO3 doping favors the antiferroelectric state of the solid solutions.•BiFeO3 doping enhances the negative electrocaloric effect of the solid solutions.•Magnetoelectric coupling is effective in enhancing the negative electrocaloric effect.

Single-phase (1-x)(0.94Bi0.5Na0.5TiO3-0.06BaTiO3)-xBiFeO3 (BNT-BT-xBF, x = 0.05, 0.1 and 0.15) solid solutions are fabricated using a modified citrate method. The structural, ferroelectric and electrocaloric properties are significantly affected by the multiferroic BiFeO3 doping, which is found to favor the antiferroelectric (AFE) state of the solid solutions. The dynamic mechanical analysis suggests that the BiFeO3 induced ordering of oxygen octahedrons plays a dominant role in the formation of AFE incommensurate phases and leads to the enhanced negative electrocaloric effect (ECE). A maximum ECE temperature change of 1.65 °C under an applied field of 70 kV/cm is observed. It is suggested that the magnetoelectric coupling is effective in enhancing the negative ECE in BNT-BT-xBF.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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