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Dielectric Dispersion and Transport Properties of Ba5LaTi3V7O30 Ceramic

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Ba5LaTi3V7O30, a compound belonging to tungsten bronze ferroelectric ceramics is prepared by using a hightemperature solid-state reaction technique. The XRD analysis of the compound shows the formation of an orthorhombic compound at room temperature. The scanning electron microscopic (SEM) study provides information on quality of the sample and the non uniform grain distribution over the entire surface of the sample. The present dielectric ceramic exhibits diffused ferroelectric phase transition at temperature around 68 °C. Detailed studies of dielectric properties of Ba5LaTi3V7O30, investigated in a wide frequency range (103–106 Hz) at different temperatures (33°–500 °C) showed that these properties of the material are strongly dependent on frequency and temperature. The activation energy calculated in different regions from the temperature dependence ac conductivity (dielectric data) plot suggest that the conduction process in the material is because of the ionicpolaronic and space charge created due to oxygen ion vacancies. The frequency dependent ac conductivity curves obey Jonscher's universal power law.
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Keywords: CERAMICS; SOLID-STATE REACTION; X-RAY DIFFRACTION

Document Type: Research Article

Publication date: February 1, 2016

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