Magnetic Properties of Y3－2xCa2xFe5－xVxO12 Garnets
Affiliation(s)
Department of Physics, P.O. Box 36, Sultan Qaboos University, Muscat, Sultanate of Oman. Department of Physics and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, USA.
Department of Physics, P.O. Box 36, Sultan Qaboos University, Muscat, Sultanate of Oman. Department of Physics and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, USA.
ABSTRACT
A comprehensive study of the magnetic properties of Y3－2xCa2xFe5－xVxO12 (0 ≤ x ≤ 1) has been performed. The garnet ferrites samples were prepared by the ceramic technique, and X-ray diffraction analysis indicates the formation of single cubic phase. Vibrating sample magnetometry (VSM) and a superconducting quantum-interference device (SQUID) were used to measure the magnetic properties, especially the magnetization and thermo-magnetic behavior. The magnetization curves exhibit the typical characteristics of ferrimagnetic materials at both 4.2 K and at room temperature. The samples have a low coercivities (between 20 and 40 Oe) and saturation magnetizations as high as 36 emu/g at 4.2 K. The saturation magnetization decreases with V and Ca contents, reaching about 8 emu/g at 4.2 K (x = 1). For all samples, the saturation magnetization decreases with increasing temperature, whereas the Curie temperature increases for small values of x, from 557 K for x = 0 to a maximum of 590 K for x = 0.2. For larger values of x, it decreases and reaches 525 K for x = 1.0. The basic experimental trends reflect the occupancy of the tetrahedral 24d sites by vanadium in combination with the predominant intersublattice exchange constant Jad, although the nonzero magnetization at x = 1.0 indicates that about 10% of the substituted V atoms goes onto the octahedral 16a sites.
A comprehensive study of the magnetic properties of Y3－2xCa2xFe5－xVxO12 (0 ≤ x ≤ 1) has been performed. The garnet ferrites samples were prepared by the ceramic technique, and X-ray diffraction analysis indicates the formation of single cubic phase. Vibrating sample magnetometry (VSM) and a superconducting quantum-interference device (SQUID) were used to measure the magnetic properties, especially the magnetization and thermo-magnetic behavior. The magnetization curves exhibit the typical characteristics of ferrimagnetic materials at both 4.2 K and at room temperature. The samples have a low coercivities (between 20 and 40 Oe) and saturation magnetizations as high as 36 emu/g at 4.2 K. The saturation magnetization decreases with V and Ca contents, reaching about 8 emu/g at 4.2 K (x = 1). For all samples, the saturation magnetization decreases with increasing temperature, whereas the Curie temperature increases for small values of x, from 557 K for x = 0 to a maximum of 590 K for x = 0.2. For larger values of x, it decreases and reaches 525 K for x = 1.0. The basic experimental trends reflect the occupancy of the tetrahedral 24d sites by vanadium in combination with the predominant intersublattice exchange constant Jad, although the nonzero magnetization at x = 1.0 indicates that about 10% of the substituted V atoms goes onto the octahedral 16a sites.
Cite this paper
I. Al-Omari, R. Skomski and D. Sellmyer, "Magnetic Properties of Y3－2xCa2xFe5－xVxO12 Garnets," Advances in Materials Physics and Chemistry, Vol. 2 No. 3, 2012, pp. 116-120. doi: 10.4236/ampc.2012.23019.
I. Al-Omari, R. Skomski and D. Sellmyer, "Magnetic Properties of Y3－2xCa2xFe5－xVxO12 Garnets," Advances in Materials Physics and Chemistry, Vol. 2 No. 3, 2012, pp. 116-120. doi: 10.4236/ampc.2012.23019.
References
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