Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ufba/598
Registro completo de metadados
Campo DCValorIdioma
dc.contributor.authorNascimento, Marcio Luis Ferreira-
dc.contributor.authorFerreira, Eduardo Bellini-
dc.contributor.authorZanotto, Edgar Dutra-
dc.creatorNascimento, Marcio Luis Ferreira-
dc.creatorFerreira, Eduardo Bellini-
dc.creatorZanotto, Edgar Dutra-
dc.date.accessioned2010-11-18T15:16:17Z-
dc.date.available2010-11-18T15:16:17Z-
dc.date.issued2004-11-
dc.identifier.issn00219606-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ufba/598-
dc.description.abstractExtensive data on the viscosity, covering 15 orders of magnitude, and crystal growth rate, covering seven orders of magnitude, of liquid diopside (CaO.MgO.2SiO(2)) were collected in a wide range of undercoolings from 1.10T(g) to 0.99T(m) (T-g is the glass transition temperature and T-m the melting point). The raw growth rate data were corrected for the increased interfacial temperature produced by the heat released during crystallization. A detailed analysis confirms that growth mediated by screw dislocations reasonably explain the experimental data in these wide ranges of temperatures and growth rates. Effective diffusion coefficients were calculated from crystal growth rates and from viscosity, and were then compared with measured self-diffusion coefficients of silicon and oxygen in diopside melt. The results show that oxygen and silicon control the diffusion dynamics involved in crystal growth and viscous flow. This study not only unveils the transport mechanism in this complex liquid, but also validates the use of viscosity (through the Stokes-Einstein or the Eyring equations) to account for the kinetic term of the crystal growth expression in a wide range of temperatures.en
dc.language.isoenen
dc.subjectVidroen
dc.subjectCristalizaçãoen
dc.subjectModeloen
dc.subjectStokes-Einsteinen
dc.subjectVogel-Fulcher-Tammann-Hesseen
dc.subjectViscosidadeen
dc.titleKinetics and mechanisms of crystal growth and diffusion in a glass-forming liquiden
dc.typeArtigo de Periódicoen
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberJournal of Chemical Physics, v. 121, n. 18, p. 8924-8928en
Aparece nas coleções:Artigo Publicado em Periódico (PEI)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
KineticsMechanismCrystalGrowthDiopside-JCP121-Nascimento.pdf93,07 kBAdobe PDFVisualizar/Abrir


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