Void species determination of Ba1−xCaxTiO3 ceramics with FSDP-related XRD

Void species nanostructure is studied in Ba1−xCaxTiO3 ceramics using X-ray diffraction with respect to first sharp diffraction peak (FSDP-related XRD). The FSDP parameters such as the interlayer separation, quasi-periodic in nature with an effective periodicity R, correlation length L, over which such periodicity is maintained, of atomic-density fluctuations, regardless of the precise atomic origin of such fluctuations, were calculated using general expressions. Void-based model may be a very useful experimental tool to study the above nanostructural peculiarities in crystalline solids. The present work is aimed to clarify methodological possibilities of this approach with calcium-modified barium titanate ceramics for the first time. In this paper we have reported for the first time, the effect of doping concentration of calcium on BaTiO3 on different parameters like structural correlation length, periodicity, nano-void diameter, the first coordination sphere radius, the magnitude of scattering vector, etc.