To Induce Multiferroic Behavior in a Lead-Free Ferro/Piezoelectric Na0.5Bi0.5tio3 (NBT)/Co0.025 System through Site Specific Cation Engineering

Kumari, Anita and Asthana, Saket (2013) To Induce Multiferroic Behavior in a Lead-Free Ferro/Piezoelectric Na0.5Bi0.5tio3 (NBT)/Co0.025 System through Site Specific Cation Engineering. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Polycrystalline samples of Na0.5Bi0.5TiO3 (NBT) and Na0.5Bi0.5Ti0.975Co0.025O3±δ (NBT-Co) were prepared by using conventional solid state sintering technique. Xray diffraction analysis showed single phase characteristics of both the samples. Further, it also gave an insight for the possibility of mixed oxidation states of Co-ion in the NBT host lattice, which is being well supported by the tolerance factor values. Magnetization measurements show a spin-glass like behavior for NBT-Co sample which is evident from the ZFC-FC plots. However, Co-ion substitution in NBT induces a paramagnetic behavior at room temperature and shows different signatures of magnetization curves below 50K. P vs. E Hysteresis measurements show improved Polarization values (Pr) and also with a slight hardening in the coercive field (EC) for NBT-Co sample.

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