The influence of transition metal oxides type M+/M++ on the vanadiumetellurite glasses electrical behavior

PABLO E. DI PR
ATULA; SOLEDAD TERNY; EVANGELINA C. CARDILLO; MARISA A. FRECHERO

SOLID STATE SCIENCES

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015 vol. 49 p. 83 - 89

1293-2558

In this work, the electrical behavior and structural features of the system xCu2O (1 - x)(0.5V2O5.0.5MoO3) 2TeO2 compared to xAg2O (1 - x) (0.5V2O5.0.5MoO3) 2TeO2 (which was alreadystudied) are explored. The main goal is to determine whether the electronic configuration of Cu+ and Ag+ions is the key to understand the interactions of these ions with vanadium ions in the glassy matrixstudied and to establish the nature of the particular electrical conductivity response. It is shown thatdespite the fact that both ions (Cu+ and Ag+) have similar electronic configurations but different sizesthey have similar electrical behaviors contrary to what is commonly accepted (i.e. silver modified glassesare completely ionic systems, while copper modified glasses are purely electronic epolaronic- semiconductors).It is expected that both behave as mixed electrical conductors, neither pure polaronic norpure ionic. It has been found that the minimum observed in the isotherm of conductivity can beexplained by the structural features of this glassy matrix and not by a change in its mechanism ofconduction.