Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFBA |
Texto Completo: | http://www.repositorio.ufba.br/ri/handle/ufba/577 |
Resumo: | Differential scanning calorimetry (DSC) was used in this work to study the effect of La2O3 addition on crystallization mechanism of barium lead zinc phosphate glasses. Bulk glasses from two different routes (using P2O5 and H3PO4 as starting materials) presented only one crystallization peak. An assessment of glass-forming ability (GFA) was performed from recent theory that is connected to glass stability (GS), and is also correlated to critical cooling rate, qcr. Systems with high La2O3 content presented some of the highest GS values and estimated critical cooling rates (qcr) lower than 0.079 K/s. For both routes were determined the activation enthalpies for crystallization, that were 126 12 kJ/mol (for P2O5) and 110 32 kJ/mol (for H3PO4). The calculated Avrami n parameters, based on exothermic crystallization peaks, were 3.50 0.33 (for P2O5) and 3.09 0.91 (for H3PO4), considering data from the lowest heating rate (5 K/min). These values suggest that the DSC peaks should be associated to volume crystallization, due to La2O3 influence, and crystallization did not change significantly using different routes. |
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Nascimento, Marcio Luis FerreiraDantas, Noelio OliveiraNascimento, Marcio Luis FerreiraDantas, Noelio Oliveira2010-11-10T19:25:30Z2010-11-10T19:25:30Z20060167577Xhttp://www.repositorio.ufba.br/ri/handle/ufba/577Materials Letters, v. 61, p. 912-916Differential scanning calorimetry (DSC) was used in this work to study the effect of La2O3 addition on crystallization mechanism of barium lead zinc phosphate glasses. Bulk glasses from two different routes (using P2O5 and H3PO4 as starting materials) presented only one crystallization peak. An assessment of glass-forming ability (GFA) was performed from recent theory that is connected to glass stability (GS), and is also correlated to critical cooling rate, qcr. Systems with high La2O3 content presented some of the highest GS values and estimated critical cooling rates (qcr) lower than 0.079 K/s. For both routes were determined the activation enthalpies for crystallization, that were 126 12 kJ/mol (for P2O5) and 110 32 kJ/mol (for H3PO4). The calculated Avrami n parameters, based on exothermic crystallization peaks, were 3.50 0.33 (for P2O5) and 3.09 0.91 (for H3PO4), considering data from the lowest heating rate (5 K/min). These values suggest that the DSC peaks should be associated to volume crystallization, due to La2O3 influence, and crystallization did not change significantly using different routes.Submitted by Marcio Luis Ferreira Nascimento (mlfn@ufba.br) on 2010-11-10T19:25:30Z No. of bitstreams: 1 AssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdf: 275520 bytes, checksum: 74e631ae3f398e3a7dedc313f97afbb2 (MD5)Made available in DSpace on 2010-11-10T19:25:30Z (GMT). No. of bitstreams: 1 AssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdf: 275520 bytes, checksum: 74e631ae3f398e3a7dedc313f97afbb2 (MD5) Previous issue date: 2007-01-01Estados UnidosVidroCristalizaçãoCrescimento de CristaisNão-IsotermicoDSCNucleaçãoCineticaAssessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glassesArtigo de Periódicoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionengreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAinfo:eu-repo/semantics/openAccessORIGINALAssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdfAssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdfapplication/pdf275520https://repositorio.ufba.br/bitstream/ufba/577/1/AssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdf74e631ae3f398e3a7dedc313f97afbb2MD51LICENSElicense.txtlicense.txttext/plain1908https://repositorio.ufba.br/bitstream/ufba/577/2/license.txt4e4b5b832601b8aeb1ab4c994088dee6MD52TEXTAssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdf.txtAssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdf.txtExtracted texttext/plain16992https://repositorio.ufba.br/bitstream/ufba/577/3/AssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdf.txtaa60fa112a79aa49c18ca934512bc53eMD53ufba/5772022-10-24 18:23:17.582oai:repositorio.ufba.br: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ório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-10-24T21:23:17Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false |
dc.title.en.fl_str_mv |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses |
title |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses |
spellingShingle |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses Nascimento, Marcio Luis Ferreira Vidro Cristalização Crescimento de Cristais Não-Isotermico DSC Nucleação Cinetica |
title_short |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses |
title_full |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses |
title_fullStr |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses |
title_full_unstemmed |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses |
title_sort |
Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glasses |
author |
Nascimento, Marcio Luis Ferreira |
author_facet |
Nascimento, Marcio Luis Ferreira Dantas, Noelio Oliveira |
author_role |
author |
author2 |
Dantas, Noelio Oliveira |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Nascimento, Marcio Luis Ferreira Dantas, Noelio Oliveira Nascimento, Marcio Luis Ferreira Dantas, Noelio Oliveira |
dc.subject.eng.fl_str_mv |
Vidro Cristalização Crescimento de Cristais Não-Isotermico DSC Nucleação Cinetica |
topic |
Vidro Cristalização Crescimento de Cristais Não-Isotermico DSC Nucleação Cinetica |
description |
Differential scanning calorimetry (DSC) was used in this work to study the effect of La2O3 addition on crystallization mechanism of barium lead zinc phosphate glasses. Bulk glasses from two different routes (using P2O5 and H3PO4 as starting materials) presented only one crystallization peak. An assessment of glass-forming ability (GFA) was performed from recent theory that is connected to glass stability (GS), and is also correlated to critical cooling rate, qcr. Systems with high La2O3 content presented some of the highest GS values and estimated critical cooling rates (qcr) lower than 0.079 K/s. For both routes were determined the activation enthalpies for crystallization, that were 126 12 kJ/mol (for P2O5) and 110 32 kJ/mol (for H3PO4). The calculated Avrami n parameters, based on exothermic crystallization peaks, were 3.50 0.33 (for P2O5) and 3.09 0.91 (for H3PO4), considering data from the lowest heating rate (5 K/min). These values suggest that the DSC peaks should be associated to volume crystallization, due to La2O3 influence, and crystallization did not change significantly using different routes. |
publishDate |
2006 |
dc.date.issued.fl_str_mv |
2006 |
dc.date.accessioned.fl_str_mv |
2010-11-10T19:25:30Z |
dc.date.available.fl_str_mv |
2010-11-10T19:25:30Z |
dc.type.driver.fl_str_mv |
Artigo de Periódico 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://www.repositorio.ufba.br/ri/handle/ufba/577 |
dc.identifier.issn.none.fl_str_mv |
0167577X |
dc.identifier.number.en.fl_str_mv |
Materials Letters, v. 61, p. 912-916 |
identifier_str_mv |
0167577X Materials Letters, v. 61, p. 912-916 |
url |
http://www.repositorio.ufba.br/ri/handle/ufba/577 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade Federal da Bahia (UFBA) |
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UFBA |
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Repositório Institucional da UFBA |
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