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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/57609
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dc.creatorGuilherme Mendes Martinspt_BR
dc.creatorPâmela de Oliveira Coelhopt_BR
dc.creatorKisla Prislen Félix Siqueirapt_BR
dc.creatorRoberto Luiz Moreirapt_BR
dc.creatorAnderson Diaspt_BR
dc.date.accessioned2023-08-08T15:39:59Z-
dc.date.available2023-08-08T15:39:59Z-
dc.date.issued2018-
dc.citation.volume18pt_BR
dc.citation.issue4pt_BR
dc.citation.spage2474pt_BR
dc.citation.epage2485pt_BR
dc.identifier.doihttps://doi.org/10.1021/acs.cgd.8b00102pt_BR
dc.identifier.issn1528-7483pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/57609-
dc.description.resumoMnMoO4 microcrystals were synthesized by hydrothermal methods, and their structural, morphological, and vibrational properties were investigated. Conventional reactors and microwave-heated hydrothermal vessels were used to synthesize micrometer-sized MnMoO4 polymorphs at different temperature and time conditions. MnMoO4·H2O crystals were obtained in both reactors at temperatures below 200 °C, for times up to 24 h. These microcrystals belong to the triclinic P1̅ space group, and their 26 characteristic Raman bands were identified. A monoclinic MnMoO4 polymorph belonging to the P2/c structure was synthesized at temperatures higher than 200 °C only into conventional hydrothermal reactors. Polarized micro-Raman analyses have evidenced and allowed the assignment of 18 phonon modes predicted by group-theory calculations for this polymorph. Another MnMoO4 polymorph, within the monoclinic C2/m space group, was obtained by two processing routes: (i) heating the P2/c microcrystals at 600 °C; or (ii) heating the MnMoO4·H2O phase at 250 °C. For this monoclinic phase, 33 Raman-active bands were identified and assigned, in very good agreement with group-theoretical calculations, which predict 36 modes for the C2/m polymorph. Well-faceted, highly crystalline microcrystals were clearly observed by scanning and transmission electron microscopies, in perfect agreement with X-ray diffraction and Raman spectroscopic analysis. Finally, the appearance of characteristic phonon modes related to molybdenum in octahedral coordination suggests an incipient crystallization of a new, unreported α-MnMoO4 polymorph, at least in a short-range degree.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.ispartofCrystal Growth & Designpt_BR
dc.rightsAcesso Restritopt_BR
dc.subjectCrystalspt_BR
dc.subjectPhysical and chemical processespt_BR
dc.subjectSpace grouppt_BR
dc.subjectTransition metalspt_BR
dc.subjectTransmission electron microscopypt_BR
dc.subject.otherCristaispt_BR
dc.subject.otherProcessos químicospt_BR
dc.subject.otherMetais de transiçãopt_BR
dc.subject.otherMicroscopia eletrônicapt_BR
dc.titleInvestigation of polymorphism and vibrational properties of MnMoO4 microcrystals prepared by hydrothermal processpt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://pubs.acs.org/doi/10.1021/acs.cgd.8b00102pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7413-1087pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7620-6708pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-6344-3103pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6820-0269pt_BR
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