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Magnetic Properties of Y3-2xCa2xFe5-xVxO12 Garnets

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DOI: 10.4236/ampc.2012.23019    3,454 Downloads   6,020 Views   Citations


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.

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The authors declare no conflicts of interest.

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.


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