Leaching of Na2O from Volcanic Glasses during Hydration:An Experimental Study
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چکیده
منابع مشابه
Magnetic properties of praseodymium ions in Na2O–Pr2O3–SiO2 glasses
Sodium praseodymium silicate glasses of nominal composition 0.3Na2O xPr2O3 (0.7 x)SiO2, where 0pxp0:10; have been studied by magnetisation and X-ray photoelectron spectroscopy (XPS). The magnetisation data fail to collapse to a single curve in the M versus H=T representation for all values of x and the spread increases with x; indicating an increase in the magnetic exchange interaction. The M v...
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Mechanical relaxation behaviour of various natural volcanic glasses have been investigated in the temperature range RT − 1000C using special low frequency flexure (f≈0.63Hz) pendulum experiments. The rheological properties complex Young’s modulus M⋆(ω, τ) and internal friction Q−1(ω, τ) have been studied from a pure elastic solid at room temperature to pure viscous melt at log(η[Pas]) = 8. The ...
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Abstract—Sodium borosilicate glasses doped with different content of NdF3 mol % have been prepared by rapid quenching method. Ultrasonic velocities (both longitudinal and shear) measurements have been carried out at room temperature and at ultrasonic frequency of 4 MHz. Elastic moduli, Debye temperature, softening temperature and Poisson's ratio have been obtained as a function of NdF3 modifier...
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A series of (CeO2)x–(Na2O)0.3–(SiO2)(0.7−x) glasses, where 0.025≤ x≤ 0.075, have been synthesized and investigated by mean of X-ray photoelectron spectroscopy (XPS). The Ce 3d spin-orbit doublet was curve fitted in order to quantify the proportions of each cerium oxidation state in these glasses. It was found that Ce ions are predominantly in the Ce(III) state in glasses with compositions x≤ 0....
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Calcium phosphate based biomaterials are extensively used in the context of tissue engineering: small changes in composition can lead to significant changes in properties allowing their use in a wide range of applications. Samples of composition (Al(2)O(3))(x)(Na(2)O)(0.11-x)(CaO)(0.445)(P(2)O(5))(0.445), where x = 0, 0.03, 0.05, and 0.08, were prepared by melt quenching. The atomic-scale struc...
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ژورنال
عنوان ژورنال: The Journal of the Geological Society of Japan
سال: 1966
ISSN: 0016-7630,1349-9963
DOI: 10.5575/geosoc.72.69