Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces
Autor(a) principal: | |
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Data de Publicação: | 1996 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/224394 |
Resumo: | The crystal nucleation rates of a metastable phase (Χ) on the surface of a near stoichiometric cordierite glass were determined for temperatures between 839 and 910°C (Tg∼800°C). The surface nucleation kinetics of that phase on our glass, as well as on a stoichiometric glass (2MgO-2Al2O3-5SiO2) studied by other authors, were analysed in terms of the classical nucleation theory, for the first time. It was shown that the effective interfacial energy for surface nucleation is substantially lower than that for homogeneous volume nucleation in silicate glasses, vindicating the assumption of heterogeneous nucleation on free glass surfaces. The average wetting angle between the nucleating crystals and the active solid particles was estimated to be around 46°. The preexponential constant was several orders of magnitude higher than the theoretical values as found for volume homogeneous nucleation in oxide glasses. |
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Repositório Institucional da UNESP |
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spelling |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfacesThe crystal nucleation rates of a metastable phase (Χ) on the surface of a near stoichiometric cordierite glass were determined for temperatures between 839 and 910°C (Tg∼800°C). The surface nucleation kinetics of that phase on our glass, as well as on a stoichiometric glass (2MgO-2Al2O3-5SiO2) studied by other authors, were analysed in terms of the classical nucleation theory, for the first time. It was shown that the effective interfacial energy for surface nucleation is substantially lower than that for homogeneous volume nucleation in silicate glasses, vindicating the assumption of heterogeneous nucleation on free glass surfaces. The average wetting angle between the nucleating crystals and the active solid particles was estimated to be around 46°. The preexponential constant was several orders of magnitude higher than the theoretical values as found for volume homogeneous nucleation in oxide glasses.Department of Materials Engineering DEMa-UFSCar, PO Box 676, 13565-905 São Carlos (SP)Department of Physics IGCE UNESP, PO Box 178, 13500-970, Rio Claro (SP)Department of Physics IGCE UNESP, PO Box 178, 13500-970, Rio Claro (SP)Universidade Federal de São Carlos (UFSCar)Universidade Estadual Paulista (UNESP)Mora, N. D.Zanotto, E. D.Ziemath, E. C. [UNESP]2022-04-28T19:56:12Z2022-04-28T19:56:12Z1996-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article258-263Physics and Chemistry of Glasses, v. 37, n. 6, p. 258-263, 1996.0031-9090http://hdl.handle.net/11449/2243942-s2.0-0344780575Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysics and Chemistry of Glassesinfo:eu-repo/semantics/openAccess2022-04-28T19:56:12Zoai:repositorio.unesp.br:11449/224394Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:42:08.826445Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces |
title |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces |
spellingShingle |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces Mora, N. D. |
title_short |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces |
title_full |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces |
title_fullStr |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces |
title_full_unstemmed |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces |
title_sort |
Crystal nucleation kinetics of a metastable phase on cordierite glass surfaces |
author |
Mora, N. D. |
author_facet |
Mora, N. D. Zanotto, E. D. Ziemath, E. C. [UNESP] |
author_role |
author |
author2 |
Zanotto, E. D. Ziemath, E. C. [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de São Carlos (UFSCar) Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Mora, N. D. Zanotto, E. D. Ziemath, E. C. [UNESP] |
description |
The crystal nucleation rates of a metastable phase (Χ) on the surface of a near stoichiometric cordierite glass were determined for temperatures between 839 and 910°C (Tg∼800°C). The surface nucleation kinetics of that phase on our glass, as well as on a stoichiometric glass (2MgO-2Al2O3-5SiO2) studied by other authors, were analysed in terms of the classical nucleation theory, for the first time. It was shown that the effective interfacial energy for surface nucleation is substantially lower than that for homogeneous volume nucleation in silicate glasses, vindicating the assumption of heterogeneous nucleation on free glass surfaces. The average wetting angle between the nucleating crystals and the active solid particles was estimated to be around 46°. The preexponential constant was several orders of magnitude higher than the theoretical values as found for volume homogeneous nucleation in oxide glasses. |
publishDate |
1996 |
dc.date.none.fl_str_mv |
1996-12-01 2022-04-28T19:56:12Z 2022-04-28T19:56:12Z |
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.uri.fl_str_mv |
Physics and Chemistry of Glasses, v. 37, n. 6, p. 258-263, 1996. 0031-9090 http://hdl.handle.net/11449/224394 2-s2.0-0344780575 |
identifier_str_mv |
Physics and Chemistry of Glasses, v. 37, n. 6, p. 258-263, 1996. 0031-9090 2-s2.0-0344780575 |
url |
http://hdl.handle.net/11449/224394 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physics and Chemistry of Glasses |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
258-263 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128688122757120 |