Structural study of Ca0.7Nd0.3Ti0.7Al0.3O3 dielectric ceramics using synchrotron X-ray diffraction

The crystal structure of Ca0.7Nd0.3Ti0.7Al0.3O3 has been determined using synchrotron X-ray diffraction. Data were collected from a polycrystalline sample for Rietveld analysis. At room temperature, the structure exhibits an octahedral tilted framework (perovskite-type) with an orthorhombic lattice (a=5.3803 Å, b=5.4003 Å and c=7.6140 Å). The positions of the atoms in the unit cell and their isotropic temperature factors have been determined, together with the occupations of sites by Ca/Nd and Al/Ti atoms. The structure was determined to feature an a−a−c+ orthorhombic tilt system in association with displacement of the A-site cations.