Publication
Physical Review B
Paper

Evidence for low octahedral-shell potential in BaTiO3 and KNbO3 from ground-state splitting of Fe3+ in cubic oxides

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Abstract

Measured octahedral S526-state splittings a(d) of Fe3+ paramagnetic ions in near-cubic oxides are compared, and vary in a systematic way as a function of lattice parameter 2 d. In BaTiO3 and KNbO3 a(d) is a factor 2.5 too small. This gives microscopic electronic evidence for a 30% low octahedral-shell potential V4 in these two ferroelectrics. In contrast to other ABO3 crystals these two undergo the cubic-to-rhombohedral phase-change sequence and have anisotropic overdamped soft modes. © 1976 The American Physical Society.

Date

01 Apr 1976

Publication

Physical Review B

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