The system K2O-PbO-SiO2
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Measuring and Modeling Viscosity of CaO-Al2O3-SiO2(-K2O) Melt
The effect of K2O on viscosity in CaO-SiO2-Al2O3 melt has been measured by a rotating spindle viscometer. It is indicated from the experimental results that viscosity first increases then decreases with the increasing content of K2O; the maximum viscosity occurs in the field of K2O/ Al2O3 > 1. After gradually adding K2O, the transformation of bridging oxygen (from being bonded with Al ion charg...
متن کاملHigh-pressure x-ray diffraction studies of the nanostructured transparent vitroceramic medium K2O-SiO2-Ga2O3
High-pressure x-ray diffraction studies of the nanostructured transparent vitroceramic medium K2O-SiO2-Ga2O3 K. E. Lipinska-Kalita,* B. Chen, M. B. Kruger, Y. Ohki, J. Murowchick, and E. P. Gogol Department of Physics, University of Missouri—Kansas City, Kansas City, Missouri 64110, USA Department of Electrical, Electronics, and Computer Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku...
متن کاملViscosity and diffusion of barium and fluoride in Na2O/K2O/Al2O3/SiO2/BaF2 glasses
The interdiffusion coefficients of barium and fluoride in glasses, in the system Na2O/K2O/Al2O3/SiO2 with BaF2 additions, were determined from the diffusion profiles using energy dispersive X-ray analysis in a scanning electron microscope. The diffusivities were in agreement with Arrhenius-equation. Diffusion coefficients of fluoride were in the range from 4.5 10 15 m s 1 to 30 10 15 m s 1 at 5...
متن کاملStudies on preparation and characterizations of CaO-Na2O-SiO2-P2O5 bioglass ceramics substituted with Li2O, K2O, ZnO, MgO, and B2O3
-The bioactive glass 45S5 (Hench glass), having composition 45 SiO2 24.5 Na2O 24.5 CaO -6 P2O5 (wt %) were prepared with substituted Li2O, K2O, ZnO, MgO, and B2O3 by conventional melting process in an electric globar furnace at 1400±10 OC. The Controlled crystallization were carried out to convert the bioglasses to their corresponding bioglass ceramics. Nucleation and crystallization regimes we...
متن کاملبررسی ساختاری بلوری و گذار فاز در سیستم شیشه سرامیک میسریتی Sio2-K2O-CaF2-CaO
Miserite, as a type of calcium potasium silicate mineral, was characterized by J.D. Scott at 1975 in the form of a chain silicate structure according to Formula. The primary cell parameters and the positioning of all atoms in the cell were characterized by scott and he also denoted that in this structure, some impurities such as,,… were substituted by as solid solution. Beal were synthesized ...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards
سال: 1936
ISSN: 0091-0635
DOI: 10.6028/jres.017.008