Thermodynamic Stability Areas of Polyvanadates of Alkaline Earth Metals

Abstract

A thermodynamic method of the global Gibbs energy variation calculation for describing heterogeneous equilibria of transformations of calcium, strontium, and barium polyvanadates, that occur in systems MeO-V2O5-H2O, where Me is the alkaline earth element, has been developed and used. Its quintessence consists in the thermodynamic analysis of the real conditions of various processes on the basis of their total thermodynamic characteristics. On the basis of the selected thermodynamic data for involved species, the thermodynamic stability areas of solid polyvanadates towards the solution pH and vanadium and alkaline earth metal ion concentrations in heterogeneous mixtures have been established, taking into account the complex formation reactions in multicomponent heterogeneous systems. The existing experimental data confirm the results on the thermodynamic stability of polyvanadates obtained in this paper.

Investigation of structural, electronic and optical properties of two-dimensional MoS 2 -doped-V 2 O 5 composites for photocatalytic application: a density functional theory study

“…The lower refractive index shows smaller polarization in the eminent energy range. The following equations are used to calculate the additional optical factors such as reflectivity, absorption, refractive index and energy loss [15,33–36]:afalse(ωfalse)=true04kπλ=ωncε2false(ωfalse),afalse(ωfalse)=2ωkfalse(ωfalse)=2 false[{ε1 false(ωfalse)2+ε2(ω)2falsefalse}1/2−ε1(ω)false]1/2,Lfalse(ωfalse)= true0ε2ε1false(ωfalse)2+ ε2false(+false)2,Ifalse(ωfalse)=2ωfalse(ε1(…”

“…The lower refractive index shows smaller polarization in the eminent energy range. The following equations are used to calculate the additional optical factors such as reflectivity, absorption, refractive index and energy loss [ 15 , 33 – 36 ]: …”