Magnetic and electrical properties of aluminium and chromium co-substituted yttrium iron garnets

Site occupancy and magnetic study of Al3+ and Cr3+ co-substituted Y3Fe5O12

“…It was shown that Al 3+ goes to the tetrahedral 24d sites in Al-doped YIG [7,8] whereas Cr 3+ preferentially occupies the unexpected octahedral site, which is attributed to the electronic configuration of Cr 3+ [7,9]. On cosubstituting nonmagnetic Al 3+ and magnetic Cr 3+ for Fe 3+ ions [10], it was reported that Cr 3+ and 60% of Al 3+ ions go to the tetrahedral sites whereas the remaining 40% of Al go to octahedral sites. However, a recent study [11] showed both Cr 3+ and Al 3+ substitute for Fe 3+ in the octahedral sites only.…”

On the effect of thermal history on magnetic properties of CuFe2−2xAlxCrxO4 system

“…There are reports on the magnetic properties of Al 3+ and Cr 3+ substituted for Fe 3+ in Ni-and Li-ferrites [3][4][5][6] and garnets [7]. The structural study on Al 3+ substituted Cu-ferrites [8] has shown the absence of tetragonal distortion for lower Al content and higher B-site occupancy of Al 3+ ions. The aim of this work is to study the influence of heat treatment on the structural and magnetic properties of Al 3+ and Cr 3+ co-substituted CuFe 2 O 4 .…”

Mössbauer study of Al and Cr co-substituted Yttrium iron garnets

“…The isomer shifts (δ) and Table 1 Lattice parameter 'a', X-ray density 'd x 'magnetization and a. c. susceptibility 'T c ' the quadruple splitting ( E Q ) indicate the presence of the high-spin Fe 3+ ions in the tetrahedral (d) and octahedral (a) sites typical of yttrium iron garnet structure. Figure 5 shows the variation of hyperfine fields and Curie temperatures (T C ) (obtained from a.c. susceptibility [6], Table 1) with Al 3+ and Cr 3+ concentrations x. Table 1].…”

“…Therefore, these systems Y 3 Al X Fe 5−X O 12 have been studied extensively by many investigators [2][3][4][5]. In our recent study of the aluminum-chromium co-substituted yttrium iron garnets Y 3 Al X Cr X Fe 5−2X O 12 [6], we have observed that the saturation magnetization (4πM s ) indicates low loss satisfying the requirements of device engineers.…”

“…These results will be supplemented with the previously measured [6], X-Ray diffraction, magnetization and a-c. susceptibility measurements.…”