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Ferroelectric domains, birefringence and absorption of single crystals of bismuth ferrate (BiFeO3)

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Published in Ferroelectrics. 1984, vol. 55, p. 235-238
Abstract The domain structure of BiFeO3 was studied by using transmission (4-800K) and reflection (300-1100K) microscopy. The rhombohedral phase transforms at ∼1083 K to a noncubic twinned phase, stable up to the decompn. at 1185 K. Because of a strong neg. temp. shift (∼-5.9 cm-1 K-1) of an absorption edge BiFeO3 turns opaque upon heating. At 15,600 cm-1 the 6A1g → 4T2g crystal field transition of Fe3+ occurs. The maximal spontaneous birefringence of the rhombohedral phase is very high (Δnγ,α = 0.58 at λ = 644 nm and room temp.) and was measured at 10-800K.
Keywords BirefringenceFerroelectric domainOptical absorption (of bismuth orthoferrite single crystals)Energy level transitionFerroelec domain bismuth orthoferriteFerrite bismuth ferroelec domainBirefringence bismuth orthoferriteOptical absorption bismuth orthoferriteAbsorption optical bismuth orthoferrite
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Structures
Project FNS: 1983
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TABARES MUNOZ, Cristobal, RIVERA, Jean-Pierre, SCHMID, Hans. Ferroelectric domains, birefringence and absorption of single crystals of bismuth ferrate (BiFeO3). In: Ferroelectrics, 1984, vol. 55, p. 235-238. https://archive-ouverte.unige.ch/unige:32128

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