Studies on composites of homo-structured La0.8Sr0.2MnO3 and Bi0.5Na0.5TiO3: Synthesis, structure and dielectric properties

Abstract

The composites of the single crystalline parent materials La0.8Sr0.2MnO3, Bi0.5Na0.5TiO3 with the composition and chemical formula as (1 - x) La0.8Sr0.2MnO3 (LSMO) + x Bi0.5Na0.5TiO3 (BNT) (x= 0.125 and 0.25) have been successfully synthesized via solid state reaction route. The phase purity and crystal structure studies were carried out using X-ray diffraction characterization. Both of the parent samples La0.8Sr0.2MnO3 and Bi0.5Na0.5TiO3 were found to have crystallized into the rhombohedral structure (R3c). The samples were investigated for the dielectric nature and it was observed that the composite samples along with Bi0.5Na0.5TiO3 show same and high dielectric constant. The composites were found to display slow rate of decrease in the dielectric constant in the high frequency range compared to the Bi0.5Na0.5TiO3. The dielectric loss was found to be higher in low Bi0.5Na0.5TiO3 concentrated composite and this loss abruptly decrease with doubling the concentration of Bi0.5Na0.5TiO3 phase but still higher than Bi0.5Na0.5TiO3.The composites of the single crystalline parent materials La0.8Sr0.2MnO3, Bi0.5Na0.5TiO3 with the composition and chemical formula as (1 - x) La0.8Sr0.2MnO3 (LSMO) + x Bi0.5Na0.5TiO3 (BNT) (x= 0.125 and 0.25) have been successfully synthesized via solid state reaction route. The phase purity and crystal structure studies were carried out using X-ray diffraction characterization. Both of the parent samples La0.8Sr0.2MnO3 and Bi0.5Na0.5TiO3 were found to have crystallized into the rhombohedral structure (R3c). The samples were investigated for the dielectric nature and it was observed that the composite samples along with Bi0.5Na0.5TiO3 show same and high dielectric constant. The composites were found to display slow rate of decrease in the dielectric constant in the high frequency range compared to the Bi0.5Na0.5TiO3. The dielectric loss was found to be higher in low Bi0.5Na0.5TiO3 concentrated composite and this loss abruptly decrease with doubling the concentration of Bi0.5Na0.5TiO3 phase but still highe...