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Dielectric properties of Ba3Sr2DyTi3V7O30 ceramics

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A polycrystalline sample, Ba3Sr2DyTi3V7O30, with tungsten bronze structure was prepared by a mixed-oxide method at high temperature (950°C). Preliminary structural analysis of the compound showed an orthorhombic crystal structure at room temperature. Surface morphology of the compound was studied by scanning electron microscopy. The dielectric anomaly at 321°C may be attributed to the ferro-paraelectric phase transitions. This was also confirmed from the appearance of a hysteresis loop. The nature of variation of the ac conductivity and value of activation energy at different temperature regions, suggest that the conduction process is of mixed-type (i.e., ionic-polaronic and space charge generated from the oxygen ion vacancies).
  • Department of Physics, Betnoti College Betnoti, Mayurbhanj, Orissa, India
  • Department of Physics, D.N. College, Itanagar, Arunachal Pradesh, India
  • Department of Physics & Meteorology, IIT, Kharagpur, 721302, India
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