Structural,electrical, optical and dielectric properties of yttrium substituted cadmium ferrites prepared by Co-Precipitation method |
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| Affiliation: | 1. Department of Physics, Research center, JNN College of Engineering, Shivamogga, Karnataka, India;2. Department of PG Studies and Research in Physics, Government Science College, Chitradurga, 577 501, Karnataka, India;3. Department of Physics, SJM College of Arts, Science and Commerce, Chitradurga, Karnataka, India;4. International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, India;1. Bahirji Smarak Mahavidylaya, Basmath, Dist. Hingoli, 431512 Maharashtra, India;2. D. S. M’s Arts, Commerce and Science College, Jintur, Dist. Parbhani, 431509 Maharashtra, India;3. Microwave Research Laboratory, N. E. S. Science College, Nanded 431601, Maharashtra, India;4. Guangdong-Technion, Israel Institute of Technology, Shantou, China;5. Technion-Israel Institute of Technology, Haifa, Israel;6. School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, Maharashtra, India;7. Shri Krishna Mahavidyalaya, Gunjoti, Tq. Omergaon, Dist. Osmanabad, 413613, Maharashtra, India;8. Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia |
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| Abstract: | The yttrium substituted cadmium ferrites having composition Cd1-xYxFe2O4 (X = 0.00, 0.125, 0.250, 0.375, 0.500) were synthesized by the co-precipitation method and sintered at 1100 °C for 6 h. Structural, morphological, electrical, optical and dielectric characteristics were explored by XRD, SEM, EDS, FTIR, I–V two probes, UV–Vis and LCR techniques.XRD results confirmed the cubic structure of spinel ferrites. A decrease in lattice constants of the prepared samples was observed with the substitution of Y ions and was attributed to the difference in ionic radii of Y3+ (0.95 Å) and Cd2+ (0.97 Å) ions. Cationic distributions, ionic radii of both tetrahedral and octahedral sites, tolerance factor, oxygen positional parameters, bond lengths, interatomic distances, positional parameters and bond length angles were calculated from XRD data. The morphology of the prepared ferrites was studied using SEM and results ratified the XRD results. EDS confirmed the presence of all inserted elements in Cd1-xYxFe2O4 composition. DC resistivity and drift mobility of soft-ferrites were found to be increased from 1.047 × 108–4.822 × 1010 Ω-cm and 5.87 × 10−12 – 1.045 × 10−14 cm2V−1s−1, respectively, at 523 K with yttrium content confirming the behavior of semiconductor materials. The optical band gap energy calculated from the UV–Vis pattern of the Cd1-xYxFe2O4 system was decreased from 3.6011 to 2.8153 eV. DC resistivity and optical band gaps exposed inverse relation. FTIR results revealed lower and upper-frequency absorption bands in the ranges of 419.31–417.01 cm−1 and 540.95–565.70 cm−1, respectively. Dielectric constant and dielectric losses were in decreasing order, while ac conductivity revealed rising behavior with increasing frequency. Results showed the potential of yttrium doped Cd nanoferrites for applications in high-frequency microwave absorbing devices. |
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| Keywords: | Yttrium ferrite XRD Optical bandgap SEM DC resistivity Frequency bands Dielectric constant |
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