The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics

Detalhes bibliográficos
Autor(a) principal: Leite,Daniela Russo
Data de Publicação: 2003
Outros Autores: Las,Wanda Cecilia, Zaghete,Maria Aparecida, Cilense,Mario, Varela,Jose Arana
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400005
Resumo: This paper reports a study of the influence of Cr concentration and preparation method in the electrical conductivity and microstructure of SnO2-based powders doped with Mn and Nb, prepared by an organic route (Pechini method) and a mixture of oxides. All the samples were compacted into discs and sintered at 1300 °C for 3h, resulting in ceramics with relative density varying between 81 and 99%. The powders were morphologically characterized by X-ray diffraction and their specific surface area was determined by N2 adsorption/desorption isotherms. Electrical conductivity characterization indicated that the conductivity decreases as Cr concentration increases, probably due to Cr segregation at grain boundaries, which reduces grain size, increasing the number of resistive boundaries, thus limiting the passage of current.
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spelling The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramicsSnO2conductivitychromiumThis paper reports a study of the influence of Cr concentration and preparation method in the electrical conductivity and microstructure of SnO2-based powders doped with Mn and Nb, prepared by an organic route (Pechini method) and a mixture of oxides. All the samples were compacted into discs and sintered at 1300 °C for 3h, resulting in ceramics with relative density varying between 81 and 99%. The powders were morphologically characterized by X-ray diffraction and their specific surface area was determined by N2 adsorption/desorption isotherms. Electrical conductivity characterization indicated that the conductivity decreases as Cr concentration increases, probably due to Cr segregation at grain boundaries, which reduces grain size, increasing the number of resistive boundaries, thus limiting the passage of current.ABM, ABC, ABPol2003-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400005Materials Research v.6 n.4 2003reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392003000400005info:eu-repo/semantics/openAccessLeite,Daniela RussoLas,Wanda CeciliaZaghete,Maria AparecidaCilense,MarioVarela,Jose Aranaeng2004-01-19T00:00:00Zoai:scielo:S1516-14392003000400005Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2004-01-19T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
title The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
spellingShingle The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
Leite,Daniela Russo
SnO2
conductivity
chromium
title_short The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
title_full The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
title_fullStr The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
title_full_unstemmed The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
title_sort The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
author Leite,Daniela Russo
author_facet Leite,Daniela Russo
Las,Wanda Cecilia
Zaghete,Maria Aparecida
Cilense,Mario
Varela,Jose Arana
author_role author
author2 Las,Wanda Cecilia
Zaghete,Maria Aparecida
Cilense,Mario
Varela,Jose Arana
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Leite,Daniela Russo
Las,Wanda Cecilia
Zaghete,Maria Aparecida
Cilense,Mario
Varela,Jose Arana
dc.subject.por.fl_str_mv SnO2
conductivity
chromium
topic SnO2
conductivity
chromium
description This paper reports a study of the influence of Cr concentration and preparation method in the electrical conductivity and microstructure of SnO2-based powders doped with Mn and Nb, prepared by an organic route (Pechini method) and a mixture of oxides. All the samples were compacted into discs and sintered at 1300 °C for 3h, resulting in ceramics with relative density varying between 81 and 99%. The powders were morphologically characterized by X-ray diffraction and their specific surface area was determined by N2 adsorption/desorption isotherms. Electrical conductivity characterization indicated that the conductivity decreases as Cr concentration increases, probably due to Cr segregation at grain boundaries, which reduces grain size, increasing the number of resistive boundaries, thus limiting the passage of current.
publishDate 2003
dc.date.none.fl_str_mv 2003-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400005
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400005
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392003000400005
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.6 n.4 2003
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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