Effect of Strontium Substitution on Impedance Properties of Ba<sub>5</sub>GdTi<sub>3</sub>V<sub>7</sub>O<sub>30</sub> Ceramics
- 1 Department of Physics, Betnoti College, Betnoti, India
- 2 Department of Physics, North Orissa University, Baripada, India
- 3 Department of Physics, Barbil College, Barbil, India
- 4 Department of Physics, BIET, Bhadrak, India
- 5 Department of Physics, Institute of Technical Education and Research, Bhubaneswar, India
Abstract
A series of compounds Ba 5-x Sr x GdTi 3 V 7 O 30 (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 Ba 5 GdTi 3 V 7 O 30 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.
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