Study of barium hexaferrite (BaFe12O19)synthesised by sol gel auto- combustion technique

摘要

The powders of barium ferrite (BaFe12O19) were synthesized from metal nitrates in the molar ratio of 1:9:10 (Ba/Fe/glycine) by a sol–gel auto combustion technique using glycine as firing agent. At the time of synthesis three types of precautions considered such as, without considering any extra agent (Sample-1), the solution maintained the Ph value 7 by adding ammonia solution (Sample-2) and by adding nitric acid (Sample-3). All the combusted samples calcined at different temperatures and time durations for confirmation of phase formation. The XRD study of calcined samples reveals the single phase formation of BaFe12O19 but for different precautions the phase formation temperatures and time durations are different. It is found that the calcined temperature for Sample-1 is 1000oC/3hr, for Sample-2 it is 950oC /3hr and for Sample-3 it is 950oC/5hr. Particle size for all the calcined samples measured by Scherrer formula. The UV-Visible spectroscopy of all samples studied and the measured band gap of all samples form UV-Visible data. For Sample-2 room temperature Dielectric and impedance spectroscopy study done by WK LCR meter.