Effect of MWO₄ (M = Ca, Sr, Ba) dispersion on the interfacial processes in (+/−)WO₃|MWO₄|WO₃(−/+) cells and transport properties of metacomposite phases

• Published in: Russian journal of inorganic chemistry 2010, Vol.55 (6), p.876-882
• Main Authors: Pestereva, N. N, Safonova, I. G, Nokhrin, S. S, Neiman, A. Ya
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Dispersions; Inorganic Chemistry; Phases; Strontium; Synthesis and Properties of Inorganic Compounds; Transport properties; Tungsten oxides
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023610060082

We compare data on the reciprocal electrosurface transfer (EST) of WO₃ and MWO₄ components through WO₃|MWO₄ eutectic heterointerfaces using MWO₄ (M = Ca, Sr, Ba) samples prepared by standard ceramic technology (CER) and nitrate-organic technology (N/O); these samples considerably differ in both the grain size of precursor powders and the grain size of sintered ceramics. When an electric field is applied, the interpenetration of WO₃ and MWO₄ components occurs though WO₃|MWO₄ (M = Ca, Sr, Ba) heterointerfaces. The general ⁽⁻⁾WO₃ ↔ MWO₄ ⁽⁺⁾ intermigration pattern in the cells is not influenced by tungstate preparation technology. However, interpenetration rates are far greater for MW ₄ N/O . The transport properties of {MWO₄ · xWO₃} two-phase eutectic metacomposites manufactured by both technologies were studied. Tungstate and composite manufacturing technologies have no radical influence on the electric properties (overall and partial conductivity, transference numbers) of the samples, only changing conductivity versus concentration relationships. Our data well fit the model of formation of a nonautonomous electrolytic interphase.