The devitrification kinetics of transparent silica glass prepared by gel-casting method

ABSTRACT The kinetics of the crystallization of cristobalite in the amorphous silica glass were studied for samples prepared by gel-casting and sintering in air. Avrami and rate equations were used to calculate the rate constants and the activation energy. The results showed that the crystallization...

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Detalhes bibliográficos
Autores: Al-Hasnawi,Ahmed Ali Kadhim, Al-Hydary,Imad Ali Disher
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:Brasil
Recursos:Matéria (Rio de Janeiro. Online)
Repositorio:Matéria (Rio de Janeiro. Online)
Idioma:inglés
OAI Identifier:oai:scielo:S1517-70762019000100344
Acesso em linha:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762019000100344
Access Level:acceso abierto
Palavra-chave:Devitrification
Gel-Casting
Silica Glass
Cristobalite
Crystallization
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spelling The devitrification kinetics of transparent silica glass prepared by gel-casting methodDevitrificationGel-CastingSilica GlassCristobaliteCrystallizationABSTRACT The kinetics of the crystallization of cristobalite in the amorphous silica glass were studied for samples prepared by gel-casting and sintering in air. Avrami and rate equations were used to calculate the rate constants and the activation energy. The results showed that the crystallization obeys the first order and occurs mainly on the surface with activation energy of 543-546kJ/mol. The fewer amounts of OH-groups and the high amount of oxygen vacancies are expected to stand behind the increase in the activation energy as compared with that reported in literatures.Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiroem cooperação com a Associação Brasileira do Hidrogênio, ABH22019-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762019000100344Matéria (Rio de Janeiro) v.24 n.1 2019reponame:Matéria (Rio de Janeiro. Online)instname:Matéria (Rio de Janeiro. Online)instacron:RLAM10.1590/s1517-707620190001.0654info:eu-repo/semantics/openAccessengAl-Hasnawi,Ahmed Ali KadhimAl-Hydary,Imad Ali Disher2019-07-03T00:00:00Zoai:scielo:S1517-70762019000100344Revistahttp://www.materia.coppe.ufrj.br/https://old.scielo.br/oai/scielo-oai.php||materia@labh2.coppe.ufrj.br1517-70761517-7076opendoar:2019-07-03T00:00Matéria (Rio de Janeiro. Online) - Matéria (Rio de Janeiro. Online)false
dc.title.none.fl_str_mv The devitrification kinetics of transparent silica glass prepared by gel-casting method
title The devitrification kinetics of transparent silica glass prepared by gel-casting method
spellingShingle The devitrification kinetics of transparent silica glass prepared by gel-casting method
Al-Hasnawi,Ahmed Ali Kadhim
Devitrification
Gel-Casting
Silica Glass
Cristobalite
Crystallization
title_short The devitrification kinetics of transparent silica glass prepared by gel-casting method
title_full The devitrification kinetics of transparent silica glass prepared by gel-casting method
title_fullStr The devitrification kinetics of transparent silica glass prepared by gel-casting method
title_full_unstemmed The devitrification kinetics of transparent silica glass prepared by gel-casting method
title_sort The devitrification kinetics of transparent silica glass prepared by gel-casting method
dc.creator.none.fl_str_mv Al-Hasnawi,Ahmed Ali Kadhim
Al-Hydary,Imad Ali Disher
author Al-Hasnawi,Ahmed Ali Kadhim
author_facet Al-Hasnawi,Ahmed Ali Kadhim
Al-Hydary,Imad Ali Disher
author_role author
author2 Al-Hydary,Imad Ali Disher
author2_role author
dc.subject.por.fl_str_mv Devitrification
Gel-Casting
Silica Glass
Cristobalite
Crystallization
topic Devitrification
Gel-Casting
Silica Glass
Cristobalite
Crystallization
description ABSTRACT The kinetics of the crystallization of cristobalite in the amorphous silica glass were studied for samples prepared by gel-casting and sintering in air. Avrami and rate equations were used to calculate the rate constants and the activation energy. The results showed that the crystallization obeys the first order and occurs mainly on the surface with activation energy of 543-546kJ/mol. The fewer amounts of OH-groups and the high amount of oxygen vacancies are expected to stand behind the increase in the activation energy as compared with that reported in literatures.
publishDate 2019
dc.date.none.fl_str_mv 2019-01-01
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=S1517-70762019000100344
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762019000100344
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/s1517-707620190001.0654
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 Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro
em cooperação com a Associação Brasileira do Hidrogênio, ABH2
publisher.none.fl_str_mv Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro
em cooperação com a Associação Brasileira do Hidrogênio, ABH2
dc.source.none.fl_str_mv Matéria (Rio de Janeiro) v.24 n.1 2019
reponame:Matéria (Rio de Janeiro. Online)
instname:Matéria (Rio de Janeiro. Online)
instacron:RLAM
instname_str Matéria (Rio de Janeiro. Online)
instacron_str RLAM
institution RLAM
reponame_str Matéria (Rio de Janeiro. Online)
collection Matéria (Rio de Janeiro. Online)
repository.name.fl_str_mv Matéria (Rio de Janeiro. Online) - Matéria (Rio de Janeiro. Online)
repository.mail.fl_str_mv ||materia@labh2.coppe.ufrj.br
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score 15.301629

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