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Temperature-dependent Structural and Spectroscopic Studies of (Bi1–xFex)FeO3
journal contribution
posted on 2018-11-08, 00:00 authored by Andrea Kirsch, M. Mangir Murshed, Melanie J. Kirkham, Ashfia Huq, F. Jochen Litterst, Thorsten
M. GesingWe
report on temperature-dependent structural and spectroscopic
features of (Bi1–xFex)FeO3 perovskite for x = 0.15 and 0.25. Samples were synthesized by heating quantum crystalline
precursors obtained by the polyol method. Crystal structures of each
composition were obtained from in-house X-ray, synchrotron X-ray,
and time-of-flight neutron powder diffraction data Rietveld refinements.
Partial replacement of the Bi site by the Fe3+ cation significantly
changes the crystal physicochemical properties, such as thermal expansion,
polyhedral distortion, Debye temperature, and vibrational and magnetic
properties. Whereas BiFeO3 is multiferroic, both Bi0.85Fe0.15FeO3 and Bi0.75Fe0.25FeO3 are found to be superparamagnetic, as observed
by temperature-dependent Mössbauer and SQUID measurements.
Lattice thermal expansion was modeled using the Debye–Einstein-anharmonicity
approach. Debye temperatures obtained from the mean-squared atomic
displacement parameter and lattice thermal expansion are compared.
Temperature dependence of selective Raman modes is also analyzed.
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Keywords
time-of-flight neutron powder diffraction data Rietveld refinementsDebye temperaturesSpectroscopic StudieslatticeBi 0.75 Fe 0.25 FeO 3Bi 0.85 Fe 0.15 FeO 3polyhedral distortionPartial replacementBi siteFeO 3synchrotron X-raySQUID measurementsTemperature-dependent Structural0.25. Samplespolyol methodTemperature dependenceBiFeO 3crystal physicochemical propertiesspectroscopic featurescrystal structuresDebye temperaturetemperature-dependentRaman modesdisplacement parameterheating quantum
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