Dielectric properties of A- and B-site-doped BaTiO3(I):La- and Al-doped solid solutions

Extremely small amounts of La and Al doping on the A and B site of BaTiO3, respectively, resulting in a solid solution of the type Ba1–3xLa2xTi1–3xAl4xO3 have been investigated. The compositions have been prepared by the Pechini process. The x-ray diffraction (XRD) reveals the presence of tetragonal (P4∕mmm) phase. The XRD data has been analyzed using FULLPROF, a Rietveld refinement package. The compositions have been characterized by dielectric spectroscopy between room temperature and 200°C. The resulting compounds (0⩽x⩽0.008) exhibit a remarkable decrease in the Curie temperature as well as a significant enhancement of the dielectric constant.