Preparation and Study of BaTiO3 Based Ferroelectric and Magneto-electric Composites

The present talk deals with the improvement of the functional properties of BaTiO3 (BTO) and broadly divided into two parts. First part discusses enhanced ferroelectric as well as electro-caloric effect near room temperature with suitable chemical doping.  Second part deals with the study of magneto-electric composite materials.  BTO is used as ferroelectric material and nickel zinc ferrite is used as magnetic component of the studied composites.  Since the phenomena of ME coupling is a strain mediated one, detailed study is undertaken by varying / controlling the stress / strain in polycrystalline ceramics and thin film composites by (i) changing the relative concentration of cation among the tetrahedral and octahedral sites in nickel zinc ferrite and (ii) controlling the growth morphology of the constituent phases.