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A series of compounds Ba5-xSrxGdTi3V7O30 (x = 0 - 5), belonging to tungsten bronze family were prepared by a high-temperature solid-state reaction route. Using X-Ray diffraction technique and Scanning Electron Micrograph, the formation and surface morphology of the compounds were studied. The X-Ray diffraction study informs the formation of single-phase orthorhombic structures. The substitution of Sr ion with increasing concentration in the compounds as per formula resulted in a variation of the electrical properties. Study of electrical properties using impedance analyzer exhibits: 1) the presence of negative temperature coefficients of resistance (NTCR) behavior; 2) presence of temperature dependent electrical relaxation phenomena; 3) evidences of single electrical relaxation attributed to the presence of bulk contribution to the electrical properties for pure Ba5GdTi3V7O30 compound; 4) an enhancement in the barrier to the mobility of charge carriers on Sr-substitution. The effects of Sr on changes in the electrical conductivity as a function of temperature at different frequency are described based on impedance spectrum analysis.

journal of modern physics

Effect of Strontium Substitution on Impedance Properties of Ba&amp;lt;sub&amp;gt;5&amp;lt;/sub&amp;gt;GdTi&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;V&amp;lt;sub&amp;gt;7&amp;lt;/sub&amp;gt;O&amp;lt;sub&amp;gt;30&amp;lt;/sub&amp;gt; Ceramics