Investigation of polymorphism and vibrational properties of MnMoO4 microcrystals prepared by hydrothermal process

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dc.creatorGuilherme Mendes Martins
dc.creatorPâmela de Oliveira Coelho
dc.creatorKisla Prislen Félix Siqueira
dc.creatorRoberto Luiz Moreira
dc.creatorAnderson Dias
dc.date.accessioned2023-08-08T15:39:59Z
dc.date.accessioned2025-09-09T00:07:23Z
dc.date.available2023-08-08T15:39:59Z
dc.date.issued2018
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/10.1021/acs.cgd.8b00102
dc.identifier.issn1528-7483
dc.identifier.urihttps://hdl.handle.net/1843/57609
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofCrystal Growth & Design
dc.rightsAcesso Restrito
dc.subjectCristais
dc.subjectProcessos químicos
dc.subjectMetais de transição
dc.subjectMicroscopia eletrônica
dc.subject.otherCrystals
dc.subject.otherPhysical and chemical processes
dc.subject.otherSpace group
dc.subject.otherTransition metals
dc.subject.otherTransmission electron microscopy
dc.titleInvestigation of polymorphism and vibrational properties of MnMoO4 microcrystals prepared by hydrothermal process
dc.typeArtigo de periódico
local.citation.epage2485
local.citation.issue4
local.citation.spage2474
local.citation.volume18
local.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.
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.identifier.orcidhttps://orcid.org/0000-0001-7620-6708
local.identifier.orcidhttps://orcid.org/0000-0002-6344-3103
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.acs.org/doi/10.1021/acs.cgd.8b00102

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