Investigation on various properties of Dy0.7Ca0.3MnO3:TiO2 based nano-micro composites

Abstract

In the present research work, manganite metal oxide nano-micro composites have been synthesized successfully wherein, chemically grown Dy0.7Ca0.3MnO3 was combined in different weight ratio composition of micron sized TiO2 (i.e., 0 %, 10 %, 20 %, 30 %, 40 % and 100 %). Prepared nano-micro DCMO:TiO2 has been characterized further wherein, structural aspects have been carried out using X-ray diffraction and W-H plot measurements which provides information regarding crystalline size, lattice strain and crystallinity. FESEM and HRTEM has been characterized for the assessment of the crystallinity and granular morphology. The elemental composition with desired stoichiometric quantities has been verified using EDAX. SAED patterns gives detailed information about intereticular distance and angles between crystallographic planes. Different frequency dependent electrical properties (i.e., dielectric constant (ε’), a.c. conductivity (σac) and impedance (Z)) carried out in the frequency range of 20 Hz to 2 MHz. The observed modified electrical properties have been understood using different theoretical models, mechanisms and different aspects (role of grain and crystalline size). Temperature dependent magnetization (M-T) measurements have been carried out to evaluate the magnetic phase shifting of the sample which has been understood using ZFC and FCC protocols. These phase shifting has been verified using M-H loop at different temperatures of 5 K and 300 K. The adaptation in magnetic properties have been discussed using different magnetic aspects.