Multiferroic bismuth ferrite
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Physical Review B
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Work of numerous research groups has shown different outcomes of studies of the transition from the
ferroelectric α-phase to the high temperature β-phase of the multiferroic, magnetoelectric perovskite Bismuth
Ferrite (BiFeO3 or BFO). Using the perturbed angular correlation (PAC) method with 111mCd as the probe
nucleus, the α to β phase transition was characterized. The phase transition temperature, the change of the
crystal structure, and its parameters were supervised with measurements at different temperatures using a six
detector PAC setup to observe the γ -γ decay of the 111mCd probe nucleus. The temperature dependence of the
hyperfine parameters shows a change in coordination of the probe ion, which substitutes for the bismuth site,
forecasting the phase transition to β-BFO by either increasing disorder or formation of a polytype transition
structure. A visible drop of the quadrupole frequency ω0 at a temperature of about Tc ≈ 820◦ C indicates the α-β
phase transition. For a given crystal symmetry, the DFT-calculations yield a specific local symmetry and electric
field gradient value of the probe ion. The Pbnm (β-BFO) crystal symmetry yields calculated local electric field
gradients, which very well match our experimental results. The assumption of other crystal symmetries results
in significantly different computed local environments not corresponding to the experiment.
Como referenciar
MARSCHICK, G.; SCHELL, J.; STÖGER, B.; GONÇALVES, J.N.; KARABASOV, M.O.; ZYABKIN, D.; WELKER, A.; ESCOBAR C., M.; GÄRTNER, D.; EFE, I.; SANTOS, R.A.; LAULAINEN, J.E.M.; LUPASCU, D.C. Multiferroic bismuth ferrite: perturbed angular correlation studies on its ferroic α-β phase transition. Physical Review B, v. 102, n. 22, p. 224110-1 - 224110-11, 2020. DOI: 10.1103/PhysRevB.102.224110. Disponível em: http://repositorio.ipen.br/handle/123456789/31813. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.