Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , |
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=S1516-14392002000100004 |
Resumo: | Differential thermal analysis and scanning electron microscopy were used to determine the influence of the addition of BaO on the crystallization mechanism of Li2O-ZrO2-SiO2 systems. As the concentration of BaO in the samples increased, a transition occurred in the predominant crystallization mechanism, which passed from superficial to volumetric. To determine the maximum nucleation rate, the crystallization kinetics of the sample containing 20 mole % BaO, which showed the most uniform crystallization, was studied by counting the nuclei with an image analyzer. The first nuclei appeared at the first endothermic inflection point (at the start of Tg, at 440 °C), while the maximum number of nuclei was counted at the midpoint of the glass transition region (446 °C). These results are similar to those observed for other materials that crystallize in volume, and confirm scanning electron microscopy data. |
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Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glassesglass ceramicsbarium oxidecrystallizationLi2O-ZrO2-SiO2 glassDifferential thermal analysis and scanning electron microscopy were used to determine the influence of the addition of BaO on the crystallization mechanism of Li2O-ZrO2-SiO2 systems. As the concentration of BaO in the samples increased, a transition occurred in the predominant crystallization mechanism, which passed from superficial to volumetric. To determine the maximum nucleation rate, the crystallization kinetics of the sample containing 20 mole % BaO, which showed the most uniform crystallization, was studied by counting the nuclei with an image analyzer. The first nuclei appeared at the first endothermic inflection point (at the start of Tg, at 440 °C), while the maximum number of nuclei was counted at the midpoint of the glass transition region (446 °C). These results are similar to those observed for other materials that crystallize in volume, and confirm scanning electron microscopy data.ABM, ABC, ABPol2002-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000100004Materials Research v.5 n.1 2002reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392002000100004info:eu-repo/semantics/openAccessSilveira,Cristian Berto daCampos,Sílvia Denofre deCampos,Elvio A. deOliveira,Antônio Pedro Novaes deeng2004-10-20T00:00:00Zoai:scielo:S1516-14392002000100004Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2004-10-20T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
title |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
spellingShingle |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses Silveira,Cristian Berto da glass ceramics barium oxide crystallization Li2O-ZrO2-SiO2 glass |
title_short |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
title_full |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
title_fullStr |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
title_full_unstemmed |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
title_sort |
Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
author |
Silveira,Cristian Berto da |
author_facet |
Silveira,Cristian Berto da Campos,Sílvia Denofre de Campos,Elvio A. de Oliveira,Antônio Pedro Novaes de |
author_role |
author |
author2 |
Campos,Sílvia Denofre de Campos,Elvio A. de Oliveira,Antônio Pedro Novaes de |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Silveira,Cristian Berto da Campos,Sílvia Denofre de Campos,Elvio A. de Oliveira,Antônio Pedro Novaes de |
dc.subject.por.fl_str_mv |
glass ceramics barium oxide crystallization Li2O-ZrO2-SiO2 glass |
topic |
glass ceramics barium oxide crystallization Li2O-ZrO2-SiO2 glass |
description |
Differential thermal analysis and scanning electron microscopy were used to determine the influence of the addition of BaO on the crystallization mechanism of Li2O-ZrO2-SiO2 systems. As the concentration of BaO in the samples increased, a transition occurred in the predominant crystallization mechanism, which passed from superficial to volumetric. To determine the maximum nucleation rate, the crystallization kinetics of the sample containing 20 mole % BaO, which showed the most uniform crystallization, was studied by counting the nuclei with an image analyzer. The first nuclei appeared at the first endothermic inflection point (at the start of Tg, at 440 °C), while the maximum number of nuclei was counted at the midpoint of the glass transition region (446 °C). These results are similar to those observed for other materials that crystallize in volume, and confirm scanning electron microscopy data. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-03-01 |
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=S1516-14392002000100004 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000100004 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1516-14392002000100004 |
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.5 n.1 2002 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 |
_version_ |
1754212656930095104 |