Thermodynamic Prediction of Sulfide Capacities in Na2O-SiO2 Melts

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...

Structural Investigation of Na2O–B2O3–SiO2 Glasses Doped with NdF3

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...

X-ray photoelectron spectroscopy of CeO2–Na2O–SiO2 glasses

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....

prediction of ignition delay period in d.i diesel engines

a semi-empirical mathematical model for predicting physical part of ignition delay period in the combustion of direct - injection diesel engines with swirl is developed . this model based on a single droplet evaporation model . the governing equations , namely , equations of droplet motion , heat and mass transfer were solved simultaneously using a rung-kutta step by step unmerical method . the...

CRYSTALLIZATION BEHAVIOUR OF GELS AND GEL-MONOLITHS IN THE Na2O-B2O3-SiO2 SYSTEM