Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method

Detalhes bibliográficos
Autor(a) principal: Malagutti, Marcelo Augusto
Data de Publicação: 2021
Outros Autores: Ulbrich, K. F., Paes, Vagner Zeizer Carvalho, Geshev, Julian Penkov, Campos, Carlos Eduardo Maduro de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/222838
Resumo: This work reports an unprecedented mechanochemistry synthesis of β-CoTe and its systematic characterization through X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and magnetometry techniques. The mechanical alloying produced the desired material within 6 h along with minor impurities, showing good stabilization for higher milling times (15 h) and long-term storage. XRPD characterization employed the Rietveld profile fitting analysis with fundamental parameters analysis in a direct convolution approach, giving the material's structure and microstructure information. For the spherical shape, the diameter mass average of the crystallites furnished values around 13 nm with 1.1% of microstrain. The double-Voigt procedure also modeled a triaxial ellipsoid shape for the crystallite size and obtained a surface-weighted average value for its volume around 150 nm3. TEM images confirmed the nanometric size visually and showed the crystallites to aggregate in large particles hundreds of nanometers in size. Measuring hundreds of supposed crystallite sizes, we could achieve a numerical distribution of their sizes with an average of 16 nm. The magnetization analysis performed both experimentally and via numerical simulations showed that β-CoTe is predominantly superparamagnetic with a magnetic domain size compatible with the double-Voigt one.
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spelling Malagutti, Marcelo AugustoUlbrich, K. F.Paes, Vagner Zeizer CarvalhoGeshev, Julian PenkovCampos, Carlos Eduardo Maduro de2021-06-25T04:24:42Z20212046-2069http://hdl.handle.net/10183/222838001123525This work reports an unprecedented mechanochemistry synthesis of β-CoTe and its systematic characterization through X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and magnetometry techniques. The mechanical alloying produced the desired material within 6 h along with minor impurities, showing good stabilization for higher milling times (15 h) and long-term storage. XRPD characterization employed the Rietveld profile fitting analysis with fundamental parameters analysis in a direct convolution approach, giving the material's structure and microstructure information. For the spherical shape, the diameter mass average of the crystallites furnished values around 13 nm with 1.1% of microstrain. The double-Voigt procedure also modeled a triaxial ellipsoid shape for the crystallite size and obtained a surface-weighted average value for its volume around 150 nm3. TEM images confirmed the nanometric size visually and showed the crystallites to aggregate in large particles hundreds of nanometers in size. Measuring hundreds of supposed crystallite sizes, we could achieve a numerical distribution of their sizes with an average of 16 nm. The magnetization analysis performed both experimentally and via numerical simulations showed that β-CoTe is predominantly superparamagnetic with a magnetic domain size compatible with the double-Voigt one.application/pdfengRSC Advances. Cambridge. Vol. 11, no. 9 (2021), p. 5027-5034Microscopia eletrônica de transmissãoDifração de raios XMagnetometriaMétodo de RietveldNanomateriaisStructural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical methodEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001123525.pdf.txt001123525.pdf.txtExtracted Texttext/plain40858http://www.lume.ufrgs.br/bitstream/10183/222838/2/001123525.pdf.txt6ea0c3beefe45835e66f1c43375833bcMD52ORIGINAL001123525.pdfTexto completo (inglês)application/pdf1027206http://www.lume.ufrgs.br/bitstream/10183/222838/1/001123525.pdfa3ee2b1271d95788cb633d8dfe00f469MD5110183/2228382023-09-17 03:31:39.951873oai:www.lume.ufrgs.br:10183/222838Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-17T06:31:39Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
title Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
spellingShingle Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
Malagutti, Marcelo Augusto
Microscopia eletrônica de transmissão
Difração de raios X
Magnetometria
Método de Rietveld
Nanomateriais
title_short Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
title_full Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
title_fullStr Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
title_full_unstemmed Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
title_sort Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method
author Malagutti, Marcelo Augusto
author_facet Malagutti, Marcelo Augusto
Ulbrich, K. F.
Paes, Vagner Zeizer Carvalho
Geshev, Julian Penkov
Campos, Carlos Eduardo Maduro de
author_role author
author2 Ulbrich, K. F.
Paes, Vagner Zeizer Carvalho
Geshev, Julian Penkov
Campos, Carlos Eduardo Maduro de
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Malagutti, Marcelo Augusto
Ulbrich, K. F.
Paes, Vagner Zeizer Carvalho
Geshev, Julian Penkov
Campos, Carlos Eduardo Maduro de
dc.subject.por.fl_str_mv Microscopia eletrônica de transmissão
Difração de raios X
Magnetometria
Método de Rietveld
Nanomateriais
topic Microscopia eletrônica de transmissão
Difração de raios X
Magnetometria
Método de Rietveld
Nanomateriais
description This work reports an unprecedented mechanochemistry synthesis of β-CoTe and its systematic characterization through X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and magnetometry techniques. The mechanical alloying produced the desired material within 6 h along with minor impurities, showing good stabilization for higher milling times (15 h) and long-term storage. XRPD characterization employed the Rietveld profile fitting analysis with fundamental parameters analysis in a direct convolution approach, giving the material's structure and microstructure information. For the spherical shape, the diameter mass average of the crystallites furnished values around 13 nm with 1.1% of microstrain. The double-Voigt procedure also modeled a triaxial ellipsoid shape for the crystallite size and obtained a surface-weighted average value for its volume around 150 nm3. TEM images confirmed the nanometric size visually and showed the crystallites to aggregate in large particles hundreds of nanometers in size. Measuring hundreds of supposed crystallite sizes, we could achieve a numerical distribution of their sizes with an average of 16 nm. The magnetization analysis performed both experimentally and via numerical simulations showed that β-CoTe is predominantly superparamagnetic with a magnetic domain size compatible with the double-Voigt one.
publishDate 2021
dc.date.accessioned.fl_str_mv 2021-06-25T04:24:42Z
dc.date.issued.fl_str_mv 2021
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dc.relation.ispartof.pt_BR.fl_str_mv RSC Advances. Cambridge. Vol. 11, no. 9 (2021), p. 5027-5034
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