期刊
PHYSICAL REVIEW B
卷 82, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.134113
关键词
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资金
- Office of Naval Research [N00014-09-1-0157]
- Department of Energy [DE-FG02-07ER46431]
We use first-principles density-functional theory calculations to investigate the dependence of tetragonality on local structure in a variety of ferroelectric solid solutions. We demonstrate that tetragonality is strongly coupled to the B-cation displacement and weakly coupled to the A-cation displacement. Examination of various BiM3+O3 additives to PbTiO3 for different M3+ ionic sizes reveals that substitution of either small B cations or low doping of large B cations gives rise to large spontaneous polarization and tetragonality. Understanding how the phase transition temperature (T-c) and tetragonality are affected by Pb- and Bi-based perovskite additives provides a rational path for designing new high-temperature piezoelectric materials.
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