Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/96443
Type: Artigo de periódico
Title: Effect Of Pressure On The Zone-center Phonons Of Pbtio3 And On The Ferroelectric-paraelectric Phase Transition
Author: Cerdeira F.
Holzapfel W.B.
Bauerle D.
Abstract: The first-order Raman spectrum of single-crystalline PhTiO3 in the teatragonal ferroelectric phase was studied at room temperature as a function of hydrostatic pressure up to 80 kbar. Mode Grüneisen parameters, as well as higher-order coefficients in the expansion of phonon frequency vs pressure are reported for all zone-center TO phonons. The pressure P1 at which the ferroelectric-paraelectric (FE → PE) phase transition would occur continously can be obtained by fitting the pressure dependence of the lowest E(TO) "soft" mode frequency with a Curie-Weiss-type law. This criterion yields P1=90±4 kbar. Limits for the first derivative of the transition temperature with pressure are similarly obtained and yield 5.2<-dTCdP<5.9 K/kbar. The information on the FE → PE phase transition obtained here is in good agreement with previously reported data obtained by measuring the pressure dependence of the dielectric constant in the PE phase. © 1975 The American Physical Society.
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Rights: aberto
Identifier DOI: 10.1103/PhysRevB.11.1188
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-35949029535&partnerID=40&md5=610fbbe9b816f60ff217e53fcf5b7fc7
Date Issue: 1975
Appears in Collections:Unicamp - Artigos e Outros Documentos

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