Made available in DSpace on 2022-04-29T08:47:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-04-25; In this paper we report an experimental and theoretical study based on a periodic density functional investigation into selected compositions of Pb1-x Cax TiO3 (x=0.0, 0.25, 0.50, and 0.75). Based on our findings, we propose that the pseudocubic structure of these perovskites presents a long-range tende...