Thermal and structural properties of magnesium tetraborate produced by solid state synthesis and precipitation for use in thermoluminescent dosimetry

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dc.contributor.authorSOUZA, LUIZA F. dept_BR
dc.contributor.authorCALDAS, LINDA V.E.pt_BR
dc.contributor.authorJUNOT, DANILO O.pt_BR
dc.contributor.authorSILVA, ANDERSON M.B.pt_BR
dc.contributor.authorSOUZA, DIVANIZIA N.pt_BR
dc.coverageInternacionalpt_BR
dc.date.accessioned2019-12-20T13:56:46Z
dc.date.available2019-12-20T13:56:46Z
dc.date.issued2019pt_BR
dc.description.abstractMagnesium tetraborate is a phosphor with relevant characteristics for radiation dosimetry purposes. One of the main challenges on this material is still the understanding of its structure and luminescent processes involved in dosimetric performance. In this work, all the steps of the material production through DTA/TG, XRD and SEM techniques were evaluated to understand the main physical and chemical changes during the thermal process (calcination and sinterization) to produce the MgB4O7 samples. Two synthesis processes of MgB4O7 were studied: precipitation (P.S) and solid state (S.S). Finally, the luminescence efficiency of the pellets was investigated in function of different sintering temperatures. The initial stage of DTA/TG curves of the material just after the mixing of starting materials, regardless the synthesis, is marked by endothermic events caused by dehydration, decomposition of hydroxyl groups and hydrated borate phases. At higher temperatures, the curves are marked by exothermic events related to crystalline transitions, but the peak obtained for the S.S is better defined in comparison to P.S. Moreover, the DTA/TG analyses of the pellets prior and after the sinterization, showed that the process is more relevant for the MgB4O7 pellets produced by S.S (950 °C), dramatically reducing its higroscopicity. The SEM images reinforce the importance of the sintering process to create a resistant detector and with a more homogenous and cohesive surface, therefore increasing it luminescence properties. The thermoluminescent (TL) sensitivity of MgB4O7:Dy0,5% pellets produced via S.S, sintered at 950 °C, is 4 times higher compared to the ones sintered at 950 °C, via P.S. The materials produced via P.S did not present relevant changes in their TL sensitivity for sintering temperatures above 400 °C.pt_BR
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)pt_BR
dc.description.sponsorshipIDCNPq: 301335/2016-8pt_BR
dc.description.sponsorshipIDCAPES: 88881.119743/2016-01pt_BR
dc.format.extent1-5pt_BR
dc.identifier.citationSOUZA, LUIZA F. de; CALDAS, LINDA V.E.; JUNOT, DANILO O.; SILVA, ANDERSON M.B.; SOUZA, DIVANIZIA N. Thermal and structural properties of magnesium tetraborate produced by solid state synthesis and precipitation for use in thermoluminescent dosimetry. <b>Radiation Physics and Chemistry</b>, v. 164, p. 1-5, 2019. DOI: <a href="https://dx.doi.org/10.1016/j.radphyschem.2019.108382">10.1016/j.radphyschem.2019.108382</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/30487.
dc.identifier.doi10.1016/j.radphyschem.2019.108382pt_BR
dc.identifier.issn0969-806Xpt_BR
dc.identifier.orcid0000-0002-7362-2455pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-7362-2455
dc.identifier.percentilfi60.153pt_BR
dc.identifier.percentilfiCiteScore73.00
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/30487
dc.identifier.vol164pt_BR
dc.relation.ispartofRadiation Physics and Chemistrypt_BR
dc.rightsopenAccesspt_BR
dc.subjectdosimetry
dc.subjectmagnesium
dc.subjectdysprosium
dc.subjectsintering
dc.subjectscanning electron microscopy
dc.subjectthermoluminescence
dc.subjectthermal analysis
dc.subjectsynthesis
dc.titleThermal and structural properties of magnesium tetraborate produced by solid state synthesis and precipitation for use in thermoluminescent dosimetrypt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorLINDA V. E. CALDAS
ipen.codigoautor1495
ipen.contributor.ipenauthorLINDA V. E. CALDAS
ipen.date.recebimento19-12
ipen.identifier.fi2.226pt_BR
ipen.identifier.fiCiteScore3.7
ipen.identifier.ipendoc26519pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.range.fi1.500 - 2.999
ipen.range.percentilfi50.00 - 74.99
ipen.type.genreArtigo
relation.isAuthorOfPublication7f46d4f4-dfd6-4485-a767-10df5b4f4f13
relation.isAuthorOfPublication.latestForDiscovery7f46d4f4-dfd6-4485-a767-10df5b4f4f13
sigepi.autor.atividadeCALDAS, LINDA V.E.:1495:330:Npt_BR
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