Das Adhikary, Gobinda and Khatua, Dipak Kumar and Mishra, Anupam and De, Arnab and Kumar, Naveen and Saha, Sujoy and Shankar, Uma and Senyshyn, Anatoliy and Rao, Badari Narayana and Ranjan, Rajeev (2019) Increasing intervention of nonferroelectric distortion and weakening of ferroelectricity at the morphotropic phase boundary in Na0.5Bi0.5TiO3-BaTiO3. In: PHYSICAL REVIEW B, 100 (13).
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Abstract
Morphotropic phase boundary (MPB) and polymorphic phase boundary ferroelectric solid solutions show enhanced electromechanical response and are sought after as actuator and transducer materials. Compared to others, the lead-free piezoelectric solid solution Na0.5Bi0.5TiO3-BaTiO3 stands out in two important respects: (i) low piezoelectric coefficients (similar to 200 pC/N) and (ii) anomalous decrease in the depolarization temperature at the MPB, the reason for which is still unclear. Here we show that both features are related; this is caused by an increasing intervention of a nonferroelectric structural distortion which compromises the gains the system acquires at the MPB via the interferroelectric instability. The propensity of the intervening nonferroelectric distortion, identified as in-phase octahedral tilt, grows considerably as the MPB is approached causing considerable structural-polar disorder, weakening the overall strength of ferroelectric interaction.
| Item Type: | Journal Article |
|---|---|
| Publication: | PHYSICAL REVIEW B |
| Publisher: | AMER PHYSICAL SOC |
| Additional Information: | Copyright of this article belongs to AMER PHYSICAL SOC. |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 23 Jan 2020 05:43 |
| Last Modified: | 23 Jan 2020 05:43 |
| URI: | http://eprints.iisc.ac.in/id/eprint/63961 |
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