High-temperature antiferroelectric and ferroelectric phase transitions in phase pure LaTaO4

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dc.creatorYuslin González-Abreu
dc.creatorKisla Prislen Félix Siqueira
dc.creatorFranklin Massami Matinaga
dc.creatorRoberto Luiz Moreira
dc.creatorAnderson Dias
dc.date.accessioned2023-08-07T19:07:13Z
dc.date.accessioned2025-09-09T01:29:23Z
dc.date.available2023-08-07T19:07:13Z
dc.date.issued2017
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.description.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1016/j.ceramint.2016.10.128
dc.identifier.issn0272-8842
dc.identifier.urihttps://hdl.handle.net/1843/57561
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofCeramics International
dc.rightsAcesso Restrito
dc.subjectCristais ferroeletricos
dc.subjectMaterial cerâmico
dc.subjectEspectros vibracionais
dc.subjectDielétricos
dc.subjectTransformações de fase (Física estatística)
dc.subjectRaman, Espectroscopia de
dc.subject.otherFerroelectrics
dc.subject.otherLaTaO4
dc.subject.otherVibrational spectroscopy
dc.subject.otherDielectrics
dc.subject.otherPhase transitions
dc.titleHigh-temperature antiferroelectric and ferroelectric phase transitions in phase pure LaTaO4
dc.typeArtigo de periódico
local.citation.epage1551
local.citation.issue1 Part B
local.citation.spage1543
local.citation.volume43
local.description.resumoPhase-pure LaTaO4 ceramics was prepared by solid-state reaction. Dielectric spectroscopic data as well as differential scanning calorimetric experiments showed the existence of a sequence two high-temperature first-order structural phase transitions. The first phase transition occurs above 160 °C (on heating), from the monoclinic P21/c space group at room temperature to the polar orthorhombic Cmc21 group, exhibiting a very large thermal hysteresis probably linked to the reconstructive nature of the structural transition. The second transition occurs around 225 °C to the orthorhombic Cmcm space group, with a small thermal hysteresis. Vibrational Raman spectroscopic analyses confirmed these two sequential phase transitions, as well as the thermal hysteresis observed for both first-order transitions in repeated heating and cooling cycles. The existence of a strong monoclinic distortion at room temperature could be related to the presence of defects (oxygen vacancies) in LaTaO4 ceramics, after sintering. Dielectric spectroscopy showed a strong influence of the electric conductivity on the dielectric response with activation energy of dc component of conductivity (0.62 eV) compatible with the presence of oxygen vacancies. Far-infrared data confirmed that the extra modes observed in the Raman spectra are forbidden bands, which were activated by defects into the structure.
local.identifier.orcidhttps://orcid.org/0000-0002-3283-761X
local.identifier.orcidhttps://orcid.org/0000-0002-6344-3103
local.identifier.orcidhttps://orcid.org/0000-0002-0507-2471
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0272884216318971

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