Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis
| Autor(a) principal: | |
|---|---|
| Data de Publicação: | 2019 |
| Outros Autores: | , , , , |
| Tipo de documento: | Artigo |
| Idioma: | eng |
| Título da fonte: | Repositório Institucional da UFMG |
| Texto Completo: | https://doi.org/10.1016/j.jmmm.2019.03.065 http://hdl.handle.net/1843/61421 https://orcid.org/0000-0001-7620-6708 https://orcid.org/0000-0002-5790-1032 https://orcid.org/0000-0003-2355-6856 https://orcid.org/0000-0003-0436-7857 https://orcid.org/0000-0001-6820-0269 https://orcid.org/0000-0001-7413-1087 |
Resumo: | CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico |
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2023-11-27T20:42:18Z2023-11-27T20:42:18Z2019482160167https://doi.org/10.1016/j.jmmm.2019.03.0650304-8853http://hdl.handle.net/1843/61421https://orcid.org/0000-0001-7620-6708https://orcid.org/0000-0002-5790-1032https://orcid.org/0000-0003-2355-6856https://orcid.org/0000-0003-0436-7857https://orcid.org/0000-0001-6820-0269https://orcid.org/0000-0001-7413-1087CNPq - Conselho Nacional de Desenvolvimento Científico e TecnológicoFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas GeraisCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorOutra AgênciaLanthanide pyrogermanates of general formula Ln2Ge2O7 (Ln = Tb, Dy, Ho, Er) were synthesized by molten-salt synthesis. Single-phase, impurity-free materials were obtained, which belong to the tetragonal P41212 space group. Highly aggregated powders with good crystallinity were visualized by transmission electron microscopy techniques. Optical-vibration properties of the pyrogermanates were examined by Raman scattering. Lattice vibrations related to lanthanide ions presented upshifts due to decreasing lattice volumes (from Tb to Er), while Raman modes related to Ge-O vibrations remain unchanged or with little shift. Dy2Ge2O7 clearly shows a peak in the dc magnetic susceptibility around 2.5 K under a relatively low applied field (paramagnetic to antiferromagnetic transition), while long-range magnetic ordering for the Tb-, Ho- and Er-containing ceramics could be observed down to 2 K. Curie-Weiss curves showed a higher Weiss temperature compared to literature in the case of Tb2Ge2O7, suggesting a weak long-range order at low temperature, in the case of our sample. For the Er2Ge2O7 compound, the presence of small Curie-Weiss temperatures reinforces the idea that antiferromagnetic and ferromagnetic dipolar exchange interactions between nearest neighbors compete at low temperature in our powders. All these features are coherent with a magnetic frustrated complex ground state such as the ones observed in the spin ices. Isothermal magnetization curves almost overlapped for the Dy, Ho and Tb compounds while it shows a sensitive non-standard behavior at low field in the case of the Er2Ge2O7.engUniversidade Federal de Minas GeraisUFMGBrasilICX - DEPARTAMENTO DE FÍSICAICX - DEPARTAMENTO DE QUÍMICAJournal of Magnetism and Magnetic MaterialsMaterial cerâmicoRaman, Espectroscopia deCompostos de lantanio - Propriedades magnéticasMicroscopia eletrônicaAntiferromagnetismoCeramicsRaman spectroscopyMagnetic propertiesPyrogermanatesLanthanidesSpin iceStructural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesisinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttps://www.sciencedirect.com/science/article/pii/S0304885318338241Guilherme Mendes MartinsSilvana MerconeRicardo P. S. M. LoboCristiano Fantini LeiteRoberto Luiz MoreiraAnderson Diasapplication/pdfinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGLICENSELicense.txtLicense.txttext/plain; charset=utf-82042https://repositorio.ufmg.br/bitstream/1843/61421/1/License.txtfa505098d172de0bc8864fc1287ffe22MD51ORIGINALStructural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis.pdfStructural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis.pdfapplication/pdf2289034https://repositorio.ufmg.br/bitstream/1843/61421/2/Structural%2c%20optical-vibration%20and%20magnetic%20properties%20of%20tetragonal%20lanthanide%20pyrogermanates%20obtained%20by%20molten-salt%20synthesis.pdfeb7f0fc0fe883b5c34eefbb5bd463351MD521843/614212023-11-27 17:42:18.601oai:repositorio.ufmg.br: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Repositório de PublicaçõesPUBhttps://repositorio.ufmg.br/oaiopendoar:2023-11-27T20:42:18Repositório Institucional da UFMG - Universidade Federal de Minas Gerais (UFMG)false |
| dc.title.pt_BR.fl_str_mv |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis |
| title |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis |
| spellingShingle |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis Guilherme Mendes Martins Ceramics Raman spectroscopy Magnetic properties Pyrogermanates Lanthanides Spin ice Material cerâmico Raman, Espectroscopia de Compostos de lantanio - Propriedades magnéticas Microscopia eletrônica Antiferromagnetismo |
| title_short |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis |
| title_full |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis |
| title_fullStr |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis |
| title_full_unstemmed |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis |
| title_sort |
Structural, optical-vibration and magnetic properties of tetragonal lanthanide pyrogermanates obtained by molten-salt synthesis |
| author |
Guilherme Mendes Martins |
| author_facet |
Guilherme Mendes Martins Silvana Mercone Ricardo P. S. M. Lobo Cristiano Fantini Leite Roberto Luiz Moreira Anderson Dias |
| author_role |
author |
| author2 |
Silvana Mercone Ricardo P. S. M. Lobo Cristiano Fantini Leite Roberto Luiz Moreira Anderson Dias |
| author2_role |
author author author author author |
| dc.contributor.author.fl_str_mv |
Guilherme Mendes Martins Silvana Mercone Ricardo P. S. M. Lobo Cristiano Fantini Leite Roberto Luiz Moreira Anderson Dias |
| dc.subject.por.fl_str_mv |
Ceramics Raman spectroscopy Magnetic properties Pyrogermanates Lanthanides Spin ice |
| topic |
Ceramics Raman spectroscopy Magnetic properties Pyrogermanates Lanthanides Spin ice Material cerâmico Raman, Espectroscopia de Compostos de lantanio - Propriedades magnéticas Microscopia eletrônica Antiferromagnetismo |
| dc.subject.other.pt_BR.fl_str_mv |
Material cerâmico Raman, Espectroscopia de Compostos de lantanio - Propriedades magnéticas Microscopia eletrônica Antiferromagnetismo |
| description |
CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico |
| publishDate |
2019 |
| dc.date.issued.fl_str_mv |
2019 |
| dc.date.accessioned.fl_str_mv |
2023-11-27T20:42:18Z |
| dc.date.available.fl_str_mv |
2023-11-27T20:42:18Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/article |
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article |
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http://hdl.handle.net/1843/61421 |
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https://doi.org/10.1016/j.jmmm.2019.03.065 |
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0304-8853 |
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https://orcid.org/0000-0001-7620-6708 https://orcid.org/0000-0002-5790-1032 https://orcid.org/0000-0003-2355-6856 https://orcid.org/0000-0003-0436-7857 https://orcid.org/0000-0001-6820-0269 https://orcid.org/0000-0001-7413-1087 |
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https://doi.org/10.1016/j.jmmm.2019.03.065 http://hdl.handle.net/1843/61421 https://orcid.org/0000-0001-7620-6708 https://orcid.org/0000-0002-5790-1032 https://orcid.org/0000-0003-2355-6856 https://orcid.org/0000-0003-0436-7857 https://orcid.org/0000-0001-6820-0269 https://orcid.org/0000-0001-7413-1087 |
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0304-8853 |
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eng |
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eng |
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Journal of Magnetism and Magnetic Materials |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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Universidade Federal de Minas Gerais |
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UFMG |
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Brasil |
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ICX - DEPARTAMENTO DE FÍSICA ICX - DEPARTAMENTO DE QUÍMICA |
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Universidade Federal de Minas Gerais |
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reponame:Repositório Institucional da UFMG instname:Universidade Federal de Minas Gerais (UFMG) instacron:UFMG |
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