Crystallographic and magnetic properties of Y3Fe5−xAlxO12

Mössbauer studies of Y3Fe5 − xAlxO12 nanopowders prepared by mechanochemical method

“…The two quadrupole doublets appearing in the spectra for the samples with x = 1.5, 2.0 are similar to those in the Mössbauer spectra of Al substituted YIG at Curie temperature [31], as the sample behaves paramagnetically. This paramagnetic component with two quadrupole doublets in our system can be attributed to paramagnetic behavior due to destruction of magnetic coupling at room temperature as a result of Al doping.…”

“…In addition, a quadrupole doublet (QS = 1.30 mm/s) with a significant relative intensity at around 38% is present in the spectrum. The nature of this doublet, which is in agreement with previously published data on YIG [30,31], is not fully understood. The intensity ratio of %24: %38 for the two magnetic components is about 2:3, which is consistent with 2 Fe 3+ ions from each formula unit occupying octahedral sites, and 3 Fe 3+ ions occupying tetrahedral sites.…”

Preparation of nano-sized Al-substituted yttrium iron garnets by the mechanochemical method and investigation of their magnetic properties

“…For reduction of H c at x ¼ 1.0, probably there are many superparamagnetic particles and particles with size less than single domain size in this sample, in such a way that decrease in coercivity due to superparamagnetism and small particles should be predominant over its increase due to the particles whose sizes are greater than that of single domain. Kim et al [25] showed that nevertheless reduction of M in all samples, H c shows a decreasing-increasing trend.…”

“…1). This is due to the fact that the radius of Al 3+ is 0.5 Å and that of Fe 3+ is 0.61 Å [25], and by substitution of Al 3+ instead of Fe 3+ a reduction of lattice parameter would be expected. Crystal lattice from 12.30 Å at x ¼ 0.5 falls to 12.21 Å at x ¼ 2 (Fig.…”

Effect of ZrO2 addition on the microstructure and electromagnetic properties of YIG

“…The interactions between and within sub-lattices of YIG can be tailored by substituting various elements in its structure leading to properties modifications. In this respect, the effect of various substitutions on the microstructure and electromagnetic properties of YIG have been studied [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Recently, Niyaifar et al [2] and Xu et al [3] investigated the effects of indium addition on the structure and magnetic properties of YIG and YBiCaVIG, respectively.…”