Localized canting of spins structure in the spinel oxide system: ZnzTizFe2−x−zCrx−zCoO4

Cation distribution and crystallographic characterization of the quaternary spinel system Mg Co1−Cr Fe2−O4

“…In the refinement model some of the cations were initially fixed to some particular sites depending on their known site preferences. Among the four cations namely, Mg, Co, Fe and Cr in the system, Cr is generally known to have strong preference for the octahedral site [8,9,26]. So in the structure refinement process Cr was fixed in its most preferential octahedral site.…”

“…From the consideration of electro-neutrality the obtained cation distribution suggests an oxidation state of three for both Fe and Cr while an oxidation state of two is consistent with both of Co and Mg. These atoms (Fe, Cr, Co and Mg) usually exist in such oxidation states in most of the spinel compounds [8,9,29,30]. The variation of the occupation factors of individual cations as a function of composition over the tetrahedral and octahedral sites are shown in Fig.…”

“…The knowledge of the crystallography including the cation distribution is thus very important for controlling and forecasting the various properties in spinels. In view of that, the crystallography including site preferences of cations in spinels have been systematized intensively and increasing emphasis are given on the exact cation distributions in complex systems [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In the present work we report crystallographic characterization and the cation distribution in the spinel system Mg x Co 1−x Cr x Fe 2−x O 4 (x = 0.0, 0.25, 0.50, 0.75 and 1.0) consisting of four different cations of which Co, Fe and Cr have close atomic numbers.…”

Magnetic structural characterization of Mg–Co–Cr ferrite by neutron diffraction

“…The observed features suggest a canted ferrimagnetic structure in the composition range xp0.75 and a semi-spin glass-like transition at x ¼ 1.0. r It is possible to alter the relative strengths of the exchange interactions in spinels by changing the type of magnetic ions as well as by selective substitution of nonmagnetic atoms on the tetrahedral (A) and octahedral (B) sites that leads to interesting spin configurations. This fascinating feature-stimulated extensive research on spinel compounds and many disordered states have been reported from a variety of studies [1][2][3][4][5][6]. It was reported that substitution of magnetic ion Cr 3+ affected the magnetic properties markedly similar to that of non-magnetic substitution [3][4][5][6].…”

“…This fascinating feature-stimulated extensive research on spinel compounds and many disordered states have been reported from a variety of studies [1][2][3][4][5][6]. It was reported that substitution of magnetic ion Cr 3+ affected the magnetic properties markedly similar to that of non-magnetic substitution [3][4][5][6].…”