Journal
PHYSICAL REVIEW B
Volume 81, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.134106
Keywords
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Funding
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy
- Office of Naval Research
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The polar behavior of double perovskite BiPbZnNbO6 and BiSrZnNbO6 was investigated using first-principles density-functional calculations within the local-density approximation. These materials have both A-site size disorder and ions with stereochemical activity. We found a strong ferroelectric distortion in both materials. The polarization of the Pb material is >80 mu C/cm(2) along the rhombohedral direction and the Sr-based material is only slightly inferior. The high polarization results mainly from a large off-centering of Bi and the large Born effective charge of Nb, which yields a large contribution to the polarization although the Nb off-centers by a smaller amount. Neither of these materials favors a tetragonal state, and therefore solid solutions with PbTiO3 may show morphotropic phase boundaries.
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