The Effect of Titanium on Some Physical Properties of CuFe2O4

Abstract

The mixed ferrite Cu1−xTixFe2O4 (where x = 0 to 0.7) are prepared by the ceramic method. X‐ray diffraction and IR absorption spectra in the range from 200 to 1000 cm−1 are used for analysing the compositions. It is observed that samples with x ≦ 0.4 exhibit spinel phase, whereas for x > 0.4 mixed phases of spinel and zincblende may be formed. For single phase x ≦ 0.4, the theoretical lattice parameter (ath) is in good agreement with the experimental value (aexp), which is of the order of 0.833 nm. The presence of Fe2+ ion in the A‐site for all samples is realized and the entrance of Ti4+ ion into the A‐site just starts at x = 0.4. Some physical properties such as density, porosity, shrinkage, and conductivity at room temperature are studied.

Effect of bismuth on the properties of Mn ferrite nanoparticles prepared by co-precipitation method

“…Hence an increase in the lattice parameter is expected. The lattice constant calculated theoretically for the spinel phase by the relation suggested by Mazen et al [4] also confirms the possible presence of bismuth in Bi 5? and Bi 3?…”

Production and characterization of pure and doped copper ferrite nanoparticles

“…In other words, heat-treating process and the doping with either Al 2 O 3 or MgO brought about the shifts in the positions of the frequency bands. The shifted positions of the absorption bands towards higher wave number by the doping process may be due to the decreasing ionic radii [38]. This indicates the substitution of either some Cu or Fe ions by the dopant ions depending upon similarity of their ionic radii [51].…”

“…The rate of reduction, i.e., the Cu + cation fraction in the B-sublattice strongly depends on the technologies of synthesis and subsequent temperature treatment. However, nanosized particles of CuFe 2 O 4 (10-30 nm), obtained by a classical ceramic technology, have also been studied [36][37][38][39][40][41][42][43]. The doping and high temperature treatment of these materials could lead to structural and magnetic surface disorders.…”

Effect of Tb substitution on structural, magnetic and electrical properties of magnesium ferrites

“…The change in the peak intensity of the spectra has been noticed with increasing Tb contents. It is well known that the intensity ratio is a function of the change of dipole moment with the inter-nuclear distance [21]. This ratio represents the contribution of the ionic bond Fe-O in the lattice.…”