resumo
We report on the synthesis, sintering, and crystallization behaviors of a glass with it composition corresponding to 90 mol % CaMgSi2O6- 10 mol % NaFeSi2O6. The investigated glass composition crystallized superficially immediately after casting of the melt and needs a high cooling rate (rapid quenching) in order to produce an amorphous glass. Differential thermal analysis and hot-stage microscopy were employed to investigate the glass forming ability, sintering behavior, relative nucleation rate, and crystallization behavior of the glass composition The crystalline phase assemblage in the glass-ceramics was studied under nonisothermal heating conditions in the temperature range of 850-950 degrees C in both air and N-2 atmosphere. X-ray diffraction studies adjoined with the Rietveld-reference intensity ratio method were employed to quantify the amount of crystalline phases, while electron microscopy was used to shed some light on the microstructure of the resultant glass-ceramics. Well sintered glass-ceramics with diopside as the primary crystalline phase were obtained where the amount of diopside varied with the heating conditions. (C) 2009 American Institute of Physics. [doi:10.1063/1.3239852]
palavras-chave
SB-SE GLASSES; CRYSTAL-GROWTH; DIOPSIDE; BIOACTIVITY; KINETICS; SYSTEM
categoria
Physics
autores
Goel, A; Ferrari, AM; Kansal, I; Pascual, MJ; Barbieri, L; Bondioli, F; Lancellotti, I; Ribeiro, MJ; Ferreira, JMF
nossos autores
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)agradecimentos
This study was financially supported by the University of Aveiro, CICECO, and FCT, Portugal (Grant No. SFRH/BD/37037/2007).