Ca(Ca1/4B2/4Ti1/4)O3 (B = Nb, Ta) COMPLEX PEROVSKITES
10.1 INTRODUCTION
The A- and B-site cations in simple perovskite structures can be substituted by a combination of other cations to form complex perovskites with the general formula A(BB′)O3, (AA″)BO3 and (AA′)(BB′)O3. A large number of permutations employing various cations in perovskite structure exists [1] because of the potential to tolerate a wide range of elements of varying size and charge. An unusual composition with the complex perovskite structure was reported by Cava and co-workers [2–5] in the Ca(Ca1/4B2/4Ti1/4)O3 (B = Nb, Ta) system, where mixing of three different cations occurs on the B site. This material is actually a composition derived [6] from CaTiO3–Ca4
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