Infrared activity in the Aurivillius layered ferroelectric SrBi2Ta2O9

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dc.contributorVirginia Techen
dc.contributor.authorMoret, M. P.en
dc.contributor.authorZallen, Richard H.en
dc.contributor.authorNewnham, R. E.en
dc.contributor.authorJoshi, Pooran C.en
dc.contributor.authorDesu, Seshu B.en
dc.contributor.departmentPhysicsen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessed2013-12-18en
dc.date.accessioned2014-02-11T13:45:57Zen
dc.date.available2014-02-11T13:45:57Zen
dc.date.issued1998-03-01en
dc.description.abstractExperimental studies were carried out on infrared-active phonons in the Aurivillius ferroelectric SrBi2Ta2O9 (SBT), using reflectivity measurements (down to 200 cm(-1)) and transmission measurements (down to 100 cm(-1)) on crystals, pellets, and thin films. An analysis was done of the contrasting consequences of the competing orthorhombic and pseudotetragonal symmetries in SBT. Reflectivity results for light polarized in the ab plane show that the anisotropy in this plane is small in the frequency range from 300 to 1200 cm(-1),, indicating the influence of the approximate tetragonal symmetry. Dielectric dispersion properties were derived for this polarization (E perpendicular to c) in this frequency range. The transverse-optical (TO) and longitudinal-optical (LO) frequencies corresponding to the dominant E perpendicular to c band are 613 and 773 cm(-1), respectively. This strong, high-frequency band arises from a mode dominated by the motion of the oxygen sublattice; its TO and LO frequencies yield an oxygen-ion Szigeti effective charge of -1.5e. Frequency estimates for the TO (LO) pairs of other strong bands are 188(330) and 334(451) cm(-1) for E perpendicular to c, and 610(675) and 780(815) cm(-1) for E parallel to c. In addition to the main infrared bands, the main Raman bands of SBT are also reported.en
dc.identifier.citationMoret, MP ; Zallen, R ; Newnham, RE ; et al., Mar 1, 1998. "Infrared activity in the Aurivillius layered ferroelectric SrBi2Ta2O9," PHYSICAL REVIEW B 57(10): 5715-5723. DOI: 10.1103/PhysRevB.57.5715en
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.57.5715en
dc.identifier.issn0163-1829en
dc.identifier.urihttp://hdl.handle.net/10919/25380en
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevB.57.5715en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectModesen
dc.subjectTemperatureen
dc.subjectDependenceen
dc.subjectCrystalsen
dc.subjectPhysicsen
dc.titleInfrared activity in the Aurivillius layered ferroelectric SrBi2Ta2O9en
dc.title.serialPhysical Review Ben
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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