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Effect of Sr substitution on structural,dielectric, magnetic and magnetoelectric properties of rapid liquid sintered BiFe0.8Ti0.2O3 ceramics |
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| Authors: | Mohit Sahni Naresh Kumar Manoj Kumar Sushant Singh |
| Affiliation: | 1. Department of Physics, Motilal Nehru National Institute of Technology Allahabad, Allahabad, U.P., India 3. Department of Physics, Sharda University, Greater Noida, U.P., India 2. Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, U.P., India |
| Abstract: | Structural, dielectric, magnetic and magnetoelectric properties of polycrystalline Sr doped BiFe0.8Ti0.2O3 ceramics Bi1?xSrx(Fe0.8Ti0.2)O3; x = 0.05, 0.10 and 0.15)] were studied. All the samples were prepared by rapid liquid phase sintering method. Rietveld refinement of X-ray diffraction patterns of all samples confirmed that the samples crystallize in a rhombohedral structure and showed change in Fe–O–Fe bond angle and Fe–O bond length which in turn enhanced magnetization from 0.33 to 0.73 emu/g with the increase in Sr concentration from x = 0.05 to 0.15. The dielectric constant and dielectric loss were observed to increase with the increase in temperature from 30 to 500 °C. An anomalous peak has been observed in dielectric constant versus temperature plot around 300 °C for all the samples, which is close to the magnetic transition temperature of BiFeO3. The composition-dependent magnetic properties with the expected Fe2+/Fe3+ ratio fluctuations were correlated by X-ray photoelectron spectroscopy. Magnetic and electric hysteresis loops showed a systematic increase in magnetization and polarization as a result of Sr doping in BiFe0.8Ti0.2O3 ceramics. The value of magnetocapacitance at 10 kHz was observed as 0.95, 1.23 and 1.73 for x = 0.05, 0.10, 0.15 respectively in Bi1?xSrxFe0.80Ti0.20O3 ceramics. |
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