The enthalpies of formation of enstatite, synthetic cordierite, forsterite and spinel are in reasonable agreement with values previously determined by solution calorimetry. The enthalpy of formation of enstatite is about 0.7 kcal less negative than the value for clinoenstatite resulting from the HF ...
Predicted formation enthalpy of MgO-ZnO alloys with respect to decomposition into B1-MgO and B1- ZnO at (a) 10 GPa, (b) 40 GPa, (c) 60 GPa, and (d) 80 GPa, respectively. increase with increasing pressure. In this direction, high pressure is obviously the right tool to widen the ...
R. The enthalpy of formation of solid borides, carbides, nitrides, silicides and phosphides of transition and noble metals. J. Less-Common Met. 82, 75 (1981). Article CAS Google Scholar Yamanouchi, M. et al. Dependence of magnetic anisotropy on MgO thickness and buffer layer in Co20Fe...
respectively, with Ko being the value at the midpoint of the independent variable. ΔXi denotes the change in variable value. To elucidate the degradation efficiency of the selected strain, response surface plots, contour graphs, and ANOVA were generated using Design-Expert 13. The analysis of ...
enthalpy change of the reaction (KJ/mol) Greek symbols ρ bulk density (kg/m3) 1. Introduction The integration of concentrated solar power (CSP) plants with thermal energy storage (TES) systems enables round-the-clock heat and power dispatchability. Of special interest are TES systems that sto...
The preferential precipitation of apatite in Yb2(5HE)2O7 than Yb2Zr2O7 is ascribed to large ionic radius of Ce4+ than Zr4+ at the AⅡ site, implying its lower enthalpy, more negative Gibbs free energy and greater spontaneity of apatite precipitation [38], [39], [40]. Therefore, Ce ...
Schematic of ST-FMR measurement. Inserted diagram illustrates the diffusion of Gd atoms toward MgO and a possible formation of a thin GdOxlayer at the top of the alloy. The FeCo is richer in the vicinity of the Pt layer whereas Gd and GdOxricher in proximity to MgO. ...
(1) Spinel appears to have an enthalpy of Mg-Al exchange on the order of 20 Kcal or more, substantially above the calorimetrically measured value. 2. (2) CaAl 2SiO 6 pyroxene has virtually complete Al-Si disorder. 3. (3) Enstatite has an enthalpy of formation from oxides at 1000 K...
The concentration of free oxide ion increases at higher proportions of metal oxides but remains at this value in more silicic melts. The rate of formation of oxide ions by polymerization in diopside melt is 0.021 ± .007 mole/l sec. Thermodynamic parameters (the standard free energy, enthalpy ...
The activation enthalpy is usually reported to be in the range 320–400 kJ/mol. Under those conditions, the dislocation density 𝜌 ρ is found to scale with the applied stress 𝜎σ following the equation 𝜌 ~ 𝜎𝑚ρ ~ σm with 𝑚=1.4m=1.4 [50], or 𝑚=2.15m=2.15 [51]....