Monitoring crystallization in lithium silicate glass-ceramics using 7Li→29Si cross-polarization NMR
نویسندگان
چکیده
a Institut für Physikalische Chemie, WWU Münster, Corrensstraße 30, D 48149 Münster, Germany b Laboratório dos Materiais Vitreous (LaMaV), Universidade Federal em São Carlos, Rod. Washington Luis, km 235, C.P. 676 13.565-905, São Carlos, SP, Brazil c Departamento de Física e Astronomia, Universidade Estadual de Ponta Grossa, CEP 84030-900 Ponta Grossa, PR, Brazil d Instituto da Física em São Carlos, Universidade de São Paulo, Avenida Trabalhador Sãocarlense 400, CEP 13.566-590, São Carlos, SP, Brazil
منابع مشابه
Effect of P2O5 on Crystallization Behavior and Chemical Resistance of Dental Glasses in the Li2O-SiO2-ZrO2 System
Commercial dental lithium disilicate based glass-ceramics containing various amounts of P2O5 were synthesized. Regarding the crystallization behavior and physico-chemical properties of the glasses, the optimum percent of P2O5 was determined.as 8 %wt. Crystallization behavior of the glasses was investigated by X-ray diffraction (XRD) and differential thermal analysis (DTA). The micro-hardness a...
متن کاملPreparation and Studies of Structural and Thermo-mechanical Aspects of Some Special Glasses and Glass-ceramics
Glasses and glass-ceramics (GCs) used for sealing, coating and high voltage applications belong to a special class of materials in which among other requirements, matching of thermal expansion coefficient with that of metal as closely as possible up to set temperature is an important consideration. In this paper I shall concentrate on some indigenous efforts carried out in my laboratory on the ...
متن کاملPockels effect of silicate glass-ceramics: Observation of optical modulation in Mach–Zehnder system
Silicate glass has been used for long time because of its advantages from material's viewpoint. In this paper, we report the observation of Pockels effect by Mach-Zehnder interferometer in polycrystalline ceramics made from a ternary silicate glass via crystallization due to heat-treatment, i.e., glass-ceramics. Since the silicate system is employed as the precursor, merits of glass material ar...
متن کاملAb Initio Calculation 29Si NMR Chemical Shift Studies on Silicate Species in Aqueous and Gas Phase
Nowadays NMR spectroscopy becomes a powerful tool in chemistry because of the NMR chemical shifts. Hartree–Fock theory and the Gauge-including atomic orbital (GIAO) methods are used in the calculation of 29Si NMR chemical shifts of various silicate species in the silicate solution as initial components for zeolite synthesis both in gas and solution phase. Calculations have been performed at geo...
متن کاملIn Vitro Bioactivity and Physical - Mechanical Properties of Fe2O3 substituted 45S5 Bioactive Glasses and Glass - ceramics
Abstract — Fe2O3 substituted 45S5 bioactive glasses were prepared. Glass derived Bioactive Glass ceramics were obtained through controlled crystallization of bioactive glasses. Nucleation and crystallization regimes were determined by the parameters obtained from differential thermal analysis (DTA) of bioactive glasses. The formed crystalline phases in bioactive glass ceramics were identified u...
متن کامل