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Journal article
First-principles study of misfit strain-stabilized ferroelectric SnTiO3
Physical review. B, v 84(24)
27 Dec 2011
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Abstract
Toxicity of lead and bismuth has motivated an active search for isovalent ferroelectric oxides free of these elements. Using first-principles density-functional calculations, we survey Sn(II) titanates with SnTiO3 stoichiometry to evaluate the phase stability of polar and nonpolar polymorphs: we predict a tetragonal perovskite P4mm phase with a large axial ratio (c/a = 1.134) and ferroelectric polarization (1.28 C/m(2)) to be the ground-state equilibrium structure. We also show that heteroepitaxial thin films of perovskite SnTiO3 promote the stereochemical lone-pair activity and simultaneously enable control over the direction of the net electric polarization and magnitude of the electronic band gap. Finally, we examine the consequence of antisite defects on the polar cation displacements by studying the substitution of Sn on Ti sites. We demonstrate that local metallic screening resulting from site substitution diminishes the magnitude of the polar distortions but does not completely quench it. Based on these calculations, we suggest that polar perovskite SnTiO3 ferroelectrics are viable thin-film alternatives to Pb- and Bi-containing oxides.
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Details
- Title
- First-principles study of misfit strain-stabilized ferroelectric SnTiO3
- Creators
- William D. Parker - Argonne National LaboratoryJames M. Rondinelli - Drexel UniversityS. M. Nakhmanson - Argonne National Laboratory
- Publication Details
- Physical review. B, v 84(24)
- Publisher
- Amer Physical Soc
- Number of pages
- 7
- Grant note
- DE-AC02-06CH11357 / Office of Advanced Scientific Computing Research US Department of Energy, Office of Science, Office of Basic Energy Sciences; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Web of Science ID
- WOS:000298563100004
- Scopus ID
- 2-s2.0-84855434311
- Other Identifier
- 991019330915304721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter