Mössbauer and magnetization study of the mixed spinel CoFe2−xCrxO4

Electrochemical behaviour of Fe x Co3−x O4 with (x = 0, 1, 2 and 3) oxides thin film electrodes in alkaline medium

“…and negative (E k-) potential limits on the voltammetric responses of each oxide electrodes was performed (Figs. [5][6][7][8]. Figure 5a shows the influence of the potential limits on the voltammetric behaviour of Co 3 O 4 oxide electrode when the starting potential is 0.500 V. Two cathodic peaks appear at ca.…”

“…Mixed oxides, with a spinel structure and containing cobalt, have been extensively studied, due to their promising catalytic activity for oxygen evolution and reduction (OER) as well as organic electro-oxidation and electro-synthesis [1][2][3]. Moreover, spinel-type oxides containing iron and cobalt have also generated great interest due to the possible applications as anode materials for batteries [4] and high density recording media [5]. Several studies on the catalytic activity for OER of spinel-type oxide thin films containing cobalt and iron have been published, namely on cobalt ferrite CoFe 2 O 4 where the Fe is partially replaced by Ni and or Mn [6], Fe x Co 3-x O 4 (0 B x B 2) [7] and ternary ferrites CoFe 2-x Cr x O 4 (0 B x B 1) [8].…”

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

“…Non-magnetic Mg ion has replaced the magnetic Co ion introducing magnetic dilution in the system. On the other hand, there are some reports that the substitution of magnetic ion Cr produces similar effects on the magnetic properties as produced by non-magnetic substitution [20][21][22][23]. Therefore, simultaneous substitution of Mg and Cr has made the system magnetically diluted and inhomogeneous which may induce interesting magnetic properties in the system.…”

Neutron diffraction studies of the magnetic ordering in the spinel oxide system Mg Co1−Cr Fe2−O4

“…This fascinating feature stimulated extensive research on spinel compounds and quite a large variety of magnetic configurations and disordered states have been reported from various kinds of studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. There have been few reports on the effect of substitution of Cr for Fe in the spinels CoFe 2 O 4 and MgFe 2 O 4 [16][17][18]. It was reported that the substitution of magnetic ion Cr 3+ affected the magnetic properties markedly similar to that of non-magnetic substitution [16][17][18][19].…”