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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/57561
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dc.creatorYuslin González-Abreupt_BR
dc.creatorKisla Prislen Félix Siqueirapt_BR
dc.creatorFranklin Massami Matinagapt_BR
dc.creatorRoberto Luiz Moreirapt_BR
dc.creatorAnderson Diaspt_BR
dc.date.accessioned2023-08-07T19:07:13Z-
dc.date.available2023-08-07T19:07:13Z-
dc.date.issued2017-
dc.citation.volume43pt_BR
dc.citation.issue1 Part Bpt_BR
dc.citation.spage1543pt_BR
dc.citation.epage1551pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.ceramint.2016.10.128pt_BR
dc.identifier.issn0272-8842pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/57561-
dc.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.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Geraispt_BR
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetospt_BR
dc.description.sponsorshipOutra Agênciapt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE FÍSICApt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE QUÍMICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofCeramics Internationalpt_BR
dc.rightsAcesso Restritopt_BR
dc.subjectFerroelectricspt_BR
dc.subjectLaTaO4pt_BR
dc.subjectVibrational spectroscopypt_BR
dc.subjectDielectricspt_BR
dc.subjectPhase transitionspt_BR
dc.subject.otherCristais ferroeletricospt_BR
dc.subject.otherMaterial cerâmicopt_BR
dc.subject.otherEspectros vibracionaispt_BR
dc.subject.otherDielétricospt_BR
dc.subject.otherTransformações de fase (Física estatística)pt_BR
dc.subject.otherRaman, Espectroscopia dept_BR
dc.titleHigh-temperature antiferroelectric and ferroelectric phase transitions in phase pure LaTaO4pt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.sciencedirect.com/science/article/pii/S0272884216318971pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-3283-761Xpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-6344-3103pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-0507-2471pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6820-0269pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7413-1087pt_BR
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