“…Experimental results have shown the partial substitution of smaller ions Dy 3+ , Ho 3+ , and Er 3+ at the B site (García-Zaldívar et al, 1997), and a preferential incorporation of larger ions (La 3+ , Nd 3+ , Sm 3+ , and Gd 3+ ) at the A site of the perovskite structure (Peláiz-Barranco et al, 2009). In PT ceramics, which has been modified with 2 and 8 at% of La 3+ ions, the behavior of the tetragonal distortion and the transition temperature has been found to be consistent with the A-site substitution, while the results for Sm 3+ , Eu 3+ , Gd 3+ , and Dy 3+ ions have suggested the incorporation at both A and B sites (Mendez-González et al, 2010;Peláiz-Barranco et al, 2010, 2012. Recently, a structural study using the extended X-ray absorption fine structure technique and Rietveld refinement on a PT compound modified with 8 at% of Eu 3+ has shown the incorporation of this ion at both sites of the perovskite structure (Mendez-González et al, 2014).…”