The effect of TiO2 addition on the microstructure and magnetic properties of Bi-CVG material

A Bi-CVG material with a composition of (Bi0.75Ca1.2Y1.05)(V0.6Fe4.4)O12 was synthesized at 1000 °C for 3 h, using a conventional mixed oxide process. The optimum sintering temperature to yield ∼95% of picnometric density of the synthesized powder material was found to be ∼1280 °C at a soaking time of 6 h. Addition of TiO2, in amounts ranging from 0.1 to 1 wt.% to a Bi-CVG material with the above composition, was found to be effective in reduction of the porosity and enhancement of the density of the sintered specimens and thus improving their magnetic properties. An addition of around 0.6 wt.% TiO2 to the above Bi-CVG material at the sintering temperature of 1170 °C for 6 h resulted in the most improved magnetic properties with a density of ∼98% of the picnometric density of the powder material. This is ascribed to lowest porosity and thus the highest sintered density which is obtained under these conditions.