Synthesis,structure and characterization of ceramic Ca4Bi2Ti4Nb6O30 |
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| Authors: | Sharma H. Kumari Kiran Singh L. S. Choudhary R. N. P. |
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| Affiliation: | (1) University Department of Physics, Veer Kunwar Singh University, 802 301 Arrah, India;(2) Department of Physics, R N College, 844 101 Hajipur, India;(3) Department of Physics and Meteorology, Indian Institute of Technology, 721 302 Kharagpur, India |
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| Abstract: | The polycrystalline samples of Ca4Bi2Ti4Nb6O30 (herein designated CBTN) were synthesized by the conventional ceramic method. Preliminary X-ray structural study of the compound showed the formation of a single phase solid solution having orthorhombic structure in the paraelectric phase. Measurements of the dielectric constant (ε) and dielectric loss (tan δ) as a function of temperature (−180–200°C) at 1 kHz and 10 kHz and also as a function of frequency (102 Hz to 104 Hz) at five different temperatures [−180°C, −40°C, − 10°C 26°C (room temperature) and 75°C] have shown a dielectric anomaly and a phase transition at − 13 ±1°C in CBTN. |
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| Keywords: | Tungsten bronze (TB) structure X-ray diffraction dielectric constant phase transition |
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