Chemical processing of hexagonal Sr-ferrite: Part II-Effect of mode of washing and filtration on the magnetic parameters

Abstract

Strontium hexaferrite has been prepared by coprecipitation technique. Controlled precipitation and subsequent low temperature processing results in the formation of ultrafine submicron particles. The coprecipitate has been washed using centrifugal filtration and decantation methods. It is then subjected to various calcination temperature ranging from 650 to 925ᵒC and subsequent sintering in the range 1050-1150ᵒC in air. The mode of washing affects the microstructure of strontium ferrite powder at the green stage, which is ultimately reflected in the magnetic properties of sintered ferrite. XRD, DTA/TG/DTG and magnetic hysteresis loop measurements have been earned out to characterize the powders and these results are discussed in the present paper.