Structural and Dielectric Properties of Calcium Bismuth Titanate (CaBi4Ti4O15) Ceramics

Abstract

Calcium Bismuth Titanate (CaBi4Ti4O15) ceramics were prepared by conventional solid-state reaction method. X-ray diffraction patterns confirms the orthorhombic structure of CaBi4Ti4O15 and the lattice parameters were also determined. Bulk densities of the sintered ceramics were measured by the Archimedes method with xylene as the liquid media and found to be 97~98% of X-ray density. The surface morphology of CaBi4Ti4O15 is studied by Scanning Electron Microscope (SEM) attached with energy dispersive X-ray spectroscopy (EDS) inorder to determine the grain size as well as the chemical composition of CaBi4Ti4O15. The dielectric constant (k) and dielectric tangent loss (tan δ) of CaBi4Ti4O15 as a function of temperature were measured in the frequency range of 100 Hz-100 KHz. The dielectric constant, dielectric loss and ac conductivity of CaBi4Ti4O15 increases gradually with an increase in the temperature from 303 to 573 K. The ac conductivity of the prepared sample reveals that the conduction mechanism is electronic hoping