Effect of La3+ doping on the electric, dielectric and magnetic properties of cobalt ferrite processed by co-precipitation technique

Investigations of lanthanum doping on magnetic properties of nano cobalt ferrites

“…La-Co ferrite of composition CoLa x Fe 2-x O 4 (x=0, 0.1, 0.15, 0.2, 0.25, 0.3) was prepared by the co-precipitation method [6,7] 13-14. Cobalt nitrate, lanthanum nitrate and iron (III) nitrate were taken in accurate stoichiometric proportions and dissolved and then added to sodium hydroxide solution already prepared. The solution was poured as quickly as possible into the boiling solution of NaOH under vigorous stirring produced by the glass mechanical stirrer (500 rpm).…”

Effect of Gd3+ doping on magnetic, electric and dielectric properties of MgGdxFe2−xO4 ferrites processed by solid state reaction technique

“…10 shows the variation of dielectric loss with frequency measured at room temperature. The dielectric loss factor decreases initially with an increase in frequency followed by the appearance of the resonance [22][23][24] with peaks occurring at higher frequencies. The decrease in dielectric loss with an increase in frequency can be explained on the basis of Koop's phenomenological model …”

Dielectric relaxation behavior of AxCo1−xFe2O4 (A=Zn, Mg) mixed ferrites

“…It was reported that the dielectric constant increases with increasing calcination temperature of CoFe 2 O 4 synthesized by chemical auto combustion route method [12]. Moreover the dielectric constant and dielectric loss is found to reduced significantly due to substitution of La 3+ ion in CoFe 2 O 4 , whereas the DC resistivity was found to be 30 times more as compared to pure CoFe 2 O 4 [13]. The DC resistivity measurement of Ni doped CoFe 2 O 4 synthesized by co-precipitation method indicates a semiconducting behavior, whereas frequency dependence dielectric constant shows the usual dispersion behavior [14].…”