STUDY OF MIXED ALKALINE? EARTH EFFECT IN A NEW FAMILY OF GLASSES BASED ON TEO2

TERNY, S.; DE LA RUBIA M; ALONSO, R.; FRECHERO M. A.; DE FRUTOS VAQUERIZO, J.

Conferencia; Electroceramics XIV; 2014

Most alkali-containing oxide glasses exhibit non-additive variations of certain properties when one alkali ion is substituted by another one. This phenomenon is known as the ?mixed alkali effect?.  Transport properties such as diffusion, conductivity and viscosity. Exhibit relatively small deviations from linearity.  The mixed alkaline earth effect is phenomenologically analogous to the M.A.E.  In literature, the mixed alkaline earth effect has been observed as nonlinearities in properties of varius silicate, phosphate and borate glasses, but there is no information available about tellurites.  The aim of this work is to study the ?Mixed Alkaline?Earth Effect? in a new family of glasses of general formula: 0.8[xBaO(1-x)MgO]0.2TM.2TeO2with TM(transition metal)=Nb2O5, V2O5, MoO3and WO3.  These new materials will be characterized by impedance spectroscopy, Raman spectroscopy, AFM, density measurements, etc. We are interested in finding out how are affected the material properties mainly with the partial change in the ratio Ba/Mg and which is the influence of transition metals(Nb, V, Mo and W).