Studies of structural and dielectric properties of Ba5BiTi3Nb7O30 ceramics |
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| Authors: | H Sharma Kiran Kumari S N Giri |
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| Affiliation: | (1) Department of Physics, Veer Kunwar Singh University, 802 301 Arrah, India;(2) Department of Physics, Dr S K S M College, 845 401 Motihari, India |
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| Abstract: | The polycrystalline samples of Ba5BiTi3Nb7O30 (hereafter BBTN) belonging to ferroelectric oxide family of tungsten bronze structure were prepared by high temperature solid-state reaction method. Preliminary X-ray analysis of the samples provided the lattice parametersa=11·9331 Å,b=14·9684 Å, andc=7·0193 Å, and also formation of a single-phase orthorhombic structure at room temperature (303 K). Detailed studies of dielectric constant (ε) and loss (tanδ) as a function of frequency (500 Hz to 10 KHz) at room temperature and also as a function of temperature (liquid nitrogen to 160°C) show the dielectric anomaly and structural phase transition at 16·8°C. |
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| Keywords: | Tungsten bronze structure X-ray diffraction dielectric constant phase transition |
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