Strontium-substituted barium vanadates,
Ba5-xSrxDyTi3V7O30 (x = 0–5), were prepared by a
high-temperature sold-state reaction method. The formation of the materials
was checked by X-ray diffraction technique. Preliminary structural analyses
of the materials exhibit the formation of new compounds in orthorhombic
structure. Surface morphology of the compounds was studied by scanning
electron microscopy. The effect of Sr on microstructure of the materials has
resulted in a modification of the electrical properties. Study of electrical
properties using impedance analysis technique exhibit (i) the presence of
negative temperature coefficient of resistance behavior, (ii) presence of
temperature dependent electrical relaxation phenomena, (iii) evidences of
single electrical relaxation attributed to the presence of bulk contribution
to the electrical properties, (iv) an enhancement in the barrier to the
mobility of charge carriers on Sr-substitution. The effects of Sr in the
electrical conductivity as a function of temperature at different frequency
are explained in impedance spectrum analyses.