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Origin of polarity in amorphous SrTiO3.
MedLine Citation:
PMID:  18233225     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Anatoly I Frenkel; David Ehre; Vera Lyahovitskaya; Leah Kanner; Ellen Wachtel; Igor Lubomirsky
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Publication Detail:
Type:  Journal Article     Date:  2007-11-20
Journal Detail:
Title:  Physical review letters     Volume:  99     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2008-01-31     Completed Date:  2008-05-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  215502     Citation Subset:  -    
Affiliation:
Physics Department, Yeshiva University, 245 Lexington Avenue, New York, New York 10016, USA. anatoly.frenkel@yu.edu
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