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Each type of ion is shown to have very nearly the same polarizability in different crystals of the perovskite type as well as in the diagonal cubic types reported previously. This conclusion is based on dielectric constant data for several titanates and zirconates and KMgF₃. The values of ionic polarizability are roughly proportional to the cube of the radius for ions in the same valence series.
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S. Roberts (1951) studied this question.
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