Abstract
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 BiFeO3doping, which is found to favor the antiferroelectric (AFE) state of the solid solutions. The dynamic mechanical analysis suggests that the BiFeO3induced 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.
Original language | English |
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Pages (from-to) | 249-255 |
Number of pages | 7 |
Journal | Journal of Alloys and Compounds |
Volume | 663 |
DOIs | |
Publication status | Published - 5 Apr 2016 |
Keywords
- Anelastic properties
- Antiferroelectric
- Electrocaloric effects
- Lead-free ferroelectrics
- Multiferroic
- Oxygen vacancies
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry