Skip navigation
Universidade Federal da Bahia |
Repositório Institucional da UFBA
Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ufba/577
Registro completo de metadados
Campo DCValorIdioma
dc.contributor.authorNascimento, Marcio Luis Ferreira-
dc.contributor.authorDantas, Noelio Oliveira-
dc.creatorNascimento, Marcio Luis Ferreira-
dc.creatorDantas, Noelio Oliveira-
dc.date.accessioned2010-11-10T19:25:30Z-
dc.date.available2010-11-10T19:25:30Z-
dc.date.issued2006-
dc.identifier.issn0167577X-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ufba/577-
dc.description.abstractDifferential 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.en
dc.language.isoenen
dc.subjectVidroen
dc.subjectCristalizaçãoen
dc.subjectCrescimento de Cristaisen
dc.subjectNão-Isotermicoen
dc.subjectDSCen
dc.subjectNucleaçãoen
dc.subjectCineticaen
dc.titleAssessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium lead zinc phosphate glassesen
dc.typeArtigo de Periódicoen
dc.typeArtigo de Periódicopt_BR
dc.description.localpubEstados Unidosen
dc.identifier.numberMaterials Letters, v. 61, p. 912-916en
Aparece nas coleções:Artigo Publicado em Periódico (PEI)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
AssesmentGFACrystallizationPhosphate-ML61-Nascimento.pdf269,06 kBAdobe PDFVisualizar/Abrir
Mostrar registro simples do item Visualizar estatísticas


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.