Both BaTiO3 and CaTiO3 have perovskite structure, but
the former belongs to tetragonal system and the latter is
cubic at room temperature. Combining BaTiO3 and CaTiO3
forms the BaTiO3-based solid solution (BaTiO3(s.s.)),
the CaTiO3-based solid solution (CaTiO3(s.s.)) or the
BaTiO3(s.s.) and CaTiO3(s.s.) two phase mixed structures,
according to the composition (Fig. 1)