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Frenkel AI, Ehre D, Lyahovitskaya V, et al. Origin of polarity in amorphous SrTiO3. Phys Rev Lett. 2007;99(21):215502doi: 10.1103/PhysRevLett.99.215502.
Frenkel, A. I., Ehre, D., Lyahovitskaya, V., Kanner, L., Wachtel, E., & Lubomirsky, I. (2007). Origin of polarity in amorphous SrTiO3. Physical review letters, 99(21), 215502. https://doi.org/10.1103/PhysRevLett.99.215502
Frenkel, Anatoly I, et al. "Origin of polarity in amorphous SrTiO3." Physical review letters vol. 99,21 (2007): 215502. doi: https://doi.org/10.1103/PhysRevLett.99.215502
Frenkel AI, Ehre D, Lyahovitskaya V, Kanner L, Wachtel E, Lubomirsky I. Origin of polarity in amorphous SrTiO3. Phys Rev Lett. 2007 Nov 23;99(21):215502. doi: 10.1103/PhysRevLett.99.215502. Epub 2007 Nov 20. PMID: 18233225.
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Phys Rev Lett. 2007 Nov 23;99(21):215502. doi: 10.1103/PhysRevLett.99.215502. Epub 2007 Nov 20.

Origin of polarity in amorphous SrTiO3.

Physical review letters

Anatoly I Frenkel, David Ehre, Vera Lyahovitskaya, Leah Kanner, Ellen Wachtel, Igor Lubomirsky

Affiliations

  1. Physics Department, Yeshiva University, 245 Lexington Avenue, New York, New York 10016, USA. [email protected]

PMID: 18233225 DOI: 10.1103/PhysRevLett.99.215502

Abstract

Although neither SrTiO3 nor BaZrO3 has any polar crystalline polymorphs, they may form noncrystalline pyro- and piezoelectric phases [Adv. Mater. 19, 1515 (2007)10.1002/adma.200602149]. These phases and the similar phase of BaTiO3 have been called quasiamorphous. In this Letter, the structure of the quasiamorphous phase of SrTiO3 is examined by the x-ray absorption fine structure technique and found to be built of a random network of polar octahedral TiO6 local bonding units. While in crystalline SrTiO3 all TiO6 octahedra are apex sharing only, in its amorphous and quasiamorphous phases, some octahedra share edges. The polarity of the quasiamorphous phase is due to the partial alignment of the TiO6 octahedra. Such a mechanism is completely different from that of inorganic polar crystals. This mechanism should be possible in a large variety of other compounds that contain similar local bonding units.

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