Comparative study of structural and magnetic properties of nano-crystalline Li0.5Fe2.5O4 prepared by various methods |
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Authors: | Vivek Verma Vibhav Pandey RP Aloysius RK Kotanala |
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Institution: | a National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India b Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India |
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Abstract: | Lithium ferrite has been considered as one of the highly strategic magnetic material. Nano-crystalline Li0.5Fe2.5O4 was prepared by four different techniques and characterized by X-ray diffraction, vibrating sample magnetometer (VSM), transmission electron microscope (TEM) and Fourier transform infrareds (FTIR). The effect of annealing temperature (700, 900 and 1050 °C) on microstructure has been correlated to the magnetic properties. From X-ray diffraction patterns, it is confirmed that the pure phase of lithium ferrite began to form at 900 °C annealing. The particle size of as-prepared lithium ferrite was observed around 40, 31, 22 and 93 nm prepared by flash combustion, sol-gel, citrate precursor and standard ceramic technique, respectively. Lithium ferrite prepared by citrate precursor method shows a maximum saturation magnetization 67.6 emu/g at 5 KOe. |
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Keywords: | Magnetic properties X-ray diffraction Nano-crystalline Microstructure Magnetization |
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