Raman spectroscopy of CaTiO₃-based perovskite solid solutions

Perovskite-structured solid solutions intended for use as microwave dielectric resonators were studied by Raman spectroscopy. Two distinct categories were investigated: (i) simple perovskite–simple perovskite solid solutions, that is, CaTiO₃–SrTiO₃ (CTST), CaTiO₃–CaZrO₃ (CTCZ), CaTiO₃–NdAlO₃ (CTNA), and CaTiO₃–LaGaO₃ (CTLG); and (ii) simple perovskite–complex perovskite solid solutions, such as CaTiO₃–SrMg_1/3Nb_2/3O₃ (CTSMN). In the latter category, the influence of A-site ion radius was also addressed by examining 0.5CaTiO₃– 0.5LaMg_1/2Ti_1/2O₃ (0.5CT–0.5LMT), 0.5SrTiO₃ (ST)–0.5LMT, and 0.5BaTiO₃ (BT)–0.5LMT. Raman data from the end members and solid solutions are compared, paying particular attention to F_2g and A_1g mode bands, often associated with ordering of B-site species.