Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/544
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dc.contributorDepartment of Applied Physics-
dc.contributorMaterials Research Centre-
dc.creatorZhou, Q-
dc.creatorChan, HLW-
dc.creatorZhang, Q-
dc.creatorChoy, CL-
dc.date.accessioned2014-12-11T08:28:22Z-
dc.date.available2014-12-11T08:28:22Z-
dc.identifier.issn0021-8979-
dc.identifier.urihttp://hdl.handle.net/10397/544-
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen_US
dc.rights© 2001 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Q.F. Zhou et al., J. Appl. Phys. 89, 8121 (2001) and may be found at http://link.aip.org/link/?jap/89/8121en_US
dc.subjectLead compoundsen_US
dc.subjectLanthanum compoundsen_US
dc.subjectRaman spectraen_US
dc.subjectParticle sizeen_US
dc.subjectHeat treatmenten_US
dc.subjectFerroelectric materialsen_US
dc.subjectCrystallitesen_US
dc.subjectNanostructured materialsen_US
dc.subjectGrain sizeen_US
dc.subjectSol-gel processingen_US
dc.subjectX-ray diffractionen_US
dc.subjectPhonon spectraen_US
dc.subjectFerroelectric transitionsen_US
dc.titleRaman spectra and structural phase transition in nanocrystalline lead lanthanum titanateen_US
dc.typeJournal/Magazine Articleen_US
dc.description.otherinformationAuthor name used in this publication: Q. F. Zhouen_US
dc.description.otherinformationAuthor name used in this publication: H. L. W. Chanen_US
dc.description.otherinformationAuthor name used in this publication: Q. Q. Zhangen_US
dc.description.otherinformationAuthor name used in this publication: C. L. Choyen_US
dc.identifier.spage8121-
dc.identifier.epage8126-
dc.identifier.volume89-
dc.identifier.issue12-
dcterms.abstractThe effects of particle size on the structure and Raman spectra of lead lanthanum titanate nanocrystalline particles are investigated. Samples with different particle sizes were prepared by the sol-gel process using different calcination temperatures. The sizes of the crystallites of particles were determined by x-ray diffraction with the aid of Scherrer's equation. Raman vibration modes of samples with various particle sizes were also studied by Raman scattering at room temperature. The results show that the tetragonal distortion of the unit cell apparently decreases with decreasing particle size: the soft A₁(1TO) phonon mode which is related to the spontaneous polarization of ferroelectric materials shifts toward lower frequency, and other peaks exhibit broadening and intensity changes with decreasing particle size. These are attributed to a phase transformation from the ferroelectric tetragonal to the paraelectric cubic phase. The above phenomena are related to a grain size-induced structural phase transition.-
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationJournal of applied physics, 15 June 2001, v. 89, no. 12, p. 8121-8126-
dcterms.isPartOfJournal of applied physics-
dcterms.issued2001-06-15-
dc.identifier.isiWOS:000169183500070-
dc.identifier.scopus2-s2.0-0035875657-
dc.identifier.eissn1089-7550-
dc.identifier.rosgroupidr01121-
dc.description.ros2000-2001 > Academic research: refereed > Publication in refereed journal-
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumberOA_IR/PIRAen_US
dc.description.pubStatusPublisheden_US
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