Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals
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Publication Date: | 2013 |
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Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UFRN |
Download full: | https://repositorio.ufrn.br/handle/123456789/45374 |
Summary: | Lead molybdate (PbMoO4) crystals were synthesized by the co-precipitation method at room temperature and then processed in a conventional hydrothermal (CH) system at low temperature (70 C for different times). These crystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, micro-Raman (MR) and Fourier transformed infrared (FT-IR) spectroscopies. Field emission scanning electron microscopy images were employed to observe the shape and monitor the crystal growth process. The optical properties were investigated by ultraviolet–visible (UV–Vis) absorption and photoluminescence (PL) measurements. XRD patterns and MR spectra indicate that these crystals have a scheelite-type tetragonal structure. Rietveld refinement data possibilities the evaluation of distortions in the tetrahedral 1⁄2MoO4 clusters. MR and FT-IR spectra exhibited a high mode m1(Ag) ascribed to symmetric stretching vibrations as well as a large absorption band with two modes m3(Eu and Au) related to anti-symmetric stretching vibrations in 1⁄2MoO4 clusters. Growth mechanisms were proposed to explain the stages involved for the formation of octahedron-like PbMoO4 crystals. UV–Vis absorption spectra indicate a reduction in optical band gap with an increase in the CH processing time. PL properties of PbMoO4 crystals have been elucidated using a model based on distortions of tetrahedral 1⁄2MoO4 clusters due to medium-range intrinsic defects and intermediary energy levels (deep and shallow holes) within the band gap |
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Delmonte, Maurício Roberto BomioCavalcante, L. S.Almeida, Márcio Aurélio PinheiroTranquilin, Ricardo LuisBatista, Nouga CardosoPizani, Paulo SérgioLi, Maximo SiuAndres, JuanSilva, Elson Longo da2021-12-15T13:56:33Z2021-12-15T13:56:33Z2013-02-13BOMIO, M.R.D.; CAVALCANTE, L.S.; ALMEIDA, M.A.P.; TRANQUILIN, R.L.; BATISTA, N.C.; PIZANI, P.S.; LI, M.S.; ANDRES, J.; LONGO, E.. Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals. Polyhedron, [S. l.], v. 50, n. 1, p. 532-545, 13 fev. 2013. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0277538712008881?via%3Dihub. Acesso em: 24 maio 2021. https://doi.org/10.1016/j.poly.2012.12.001.0277-5387https://repositorio.ufrn.br/handle/123456789/4537410.1016/j.poly.2012.12.001ElsevierAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/info:eu-repo/semantics/openAccessClustersPrecipitationCrystal structureRamanLuminescenceStructural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystalsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleLead molybdate (PbMoO4) crystals were synthesized by the co-precipitation method at room temperature and then processed in a conventional hydrothermal (CH) system at low temperature (70 C for different times). These crystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, micro-Raman (MR) and Fourier transformed infrared (FT-IR) spectroscopies. Field emission scanning electron microscopy images were employed to observe the shape and monitor the crystal growth process. The optical properties were investigated by ultraviolet–visible (UV–Vis) absorption and photoluminescence (PL) measurements. XRD patterns and MR spectra indicate that these crystals have a scheelite-type tetragonal structure. Rietveld refinement data possibilities the evaluation of distortions in the tetrahedral 1⁄2MoO4 clusters. MR and FT-IR spectra exhibited a high mode m1(Ag) ascribed to symmetric stretching vibrations as well as a large absorption band with two modes m3(Eu and Au) related to anti-symmetric stretching vibrations in 1⁄2MoO4 clusters. Growth mechanisms were proposed to explain the stages involved for the formation of octahedron-like PbMoO4 crystals. UV–Vis absorption spectra indicate a reduction in optical band gap with an increase in the CH processing time. PL properties of PbMoO4 crystals have been elucidated using a model based on distortions of tetrahedral 1⁄2MoO4 clusters due to medium-range intrinsic defects and intermediary energy levels (deep and shallow holes) within the band gapengreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNORIGINALStructuralRefinementGrowth_BOMIO_2013.pdfStructuralRefinementGrowth_BOMIO_2013.pdfapplication/pdf3365119https://repositorio.ufrn.br/bitstream/123456789/45374/1/StructuralRefinementGrowth_BOMIO_2013.pdf3345888bb70c2250a68f763f9f55de1dMD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/45374/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8914https://repositorio.ufrn.br/bitstream/123456789/45374/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD52123456789/453742021-12-15 10:56:34.18oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2021-12-15T13:56:34Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.pt_BR.fl_str_mv |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals |
title |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals |
spellingShingle |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals Delmonte, Maurício Roberto Bomio Clusters Precipitation Crystal structure Raman Luminescence |
title_short |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals |
title_full |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals |
title_fullStr |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals |
title_full_unstemmed |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals |
title_sort |
Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals |
author |
Delmonte, Maurício Roberto Bomio |
author_facet |
Delmonte, Maurício Roberto Bomio Cavalcante, L. S. Almeida, Márcio Aurélio Pinheiro Tranquilin, Ricardo Luis Batista, Nouga Cardoso Pizani, Paulo Sérgio Li, Maximo Siu Andres, Juan Silva, Elson Longo da |
author_role |
author |
author2 |
Cavalcante, L. S. Almeida, Márcio Aurélio Pinheiro Tranquilin, Ricardo Luis Batista, Nouga Cardoso Pizani, Paulo Sérgio Li, Maximo Siu Andres, Juan Silva, Elson Longo da |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Delmonte, Maurício Roberto Bomio Cavalcante, L. S. Almeida, Márcio Aurélio Pinheiro Tranquilin, Ricardo Luis Batista, Nouga Cardoso Pizani, Paulo Sérgio Li, Maximo Siu Andres, Juan Silva, Elson Longo da |
dc.subject.por.fl_str_mv |
Clusters Precipitation Crystal structure Raman Luminescence |
topic |
Clusters Precipitation Crystal structure Raman Luminescence |
description |
Lead molybdate (PbMoO4) crystals were synthesized by the co-precipitation method at room temperature and then processed in a conventional hydrothermal (CH) system at low temperature (70 C for different times). These crystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, micro-Raman (MR) and Fourier transformed infrared (FT-IR) spectroscopies. Field emission scanning electron microscopy images were employed to observe the shape and monitor the crystal growth process. The optical properties were investigated by ultraviolet–visible (UV–Vis) absorption and photoluminescence (PL) measurements. XRD patterns and MR spectra indicate that these crystals have a scheelite-type tetragonal structure. Rietveld refinement data possibilities the evaluation of distortions in the tetrahedral 1⁄2MoO4 clusters. MR and FT-IR spectra exhibited a high mode m1(Ag) ascribed to symmetric stretching vibrations as well as a large absorption band with two modes m3(Eu and Au) related to anti-symmetric stretching vibrations in 1⁄2MoO4 clusters. Growth mechanisms were proposed to explain the stages involved for the formation of octahedron-like PbMoO4 crystals. UV–Vis absorption spectra indicate a reduction in optical band gap with an increase in the CH processing time. PL properties of PbMoO4 crystals have been elucidated using a model based on distortions of tetrahedral 1⁄2MoO4 clusters due to medium-range intrinsic defects and intermediary energy levels (deep and shallow holes) within the band gap |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-02-13 |
dc.date.accessioned.fl_str_mv |
2021-12-15T13:56:33Z |
dc.date.available.fl_str_mv |
2021-12-15T13:56:33Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
BOMIO, M.R.D.; CAVALCANTE, L.S.; ALMEIDA, M.A.P.; TRANQUILIN, R.L.; BATISTA, N.C.; PIZANI, P.S.; LI, M.S.; ANDRES, J.; LONGO, E.. Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals. Polyhedron, [S. l.], v. 50, n. 1, p. 532-545, 13 fev. 2013. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0277538712008881?via%3Dihub. Acesso em: 24 maio 2021. https://doi.org/10.1016/j.poly.2012.12.001. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/handle/123456789/45374 |
dc.identifier.issn.none.fl_str_mv |
0277-5387 |
dc.identifier.doi.none.fl_str_mv |
10.1016/j.poly.2012.12.001 |
identifier_str_mv |
BOMIO, M.R.D.; CAVALCANTE, L.S.; ALMEIDA, M.A.P.; TRANQUILIN, R.L.; BATISTA, N.C.; PIZANI, P.S.; LI, M.S.; ANDRES, J.; LONGO, E.. Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals. Polyhedron, [S. l.], v. 50, n. 1, p. 532-545, 13 fev. 2013. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0277538712008881?via%3Dihub. Acesso em: 24 maio 2021. https://doi.org/10.1016/j.poly.2012.12.001. 0277-5387 10.1016/j.poly.2012.12.001 |
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https://repositorio.ufrn.br/handle/123456789/45374 |
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eng |
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eng |
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Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ |
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openAccess |
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Elsevier |
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Elsevier |
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UFRN |
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UFRN |
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Repositório Institucional da UFRN |
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