2021
DOI: 10.3390/ma14195805
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Crystal and Magnetic Structure Transitions in BiMnO3+δ Ceramics Driven by Cation Vacancies and Temperature

Abstract: The crystal structure of BiMnO3+δ ceramics has been studied as a function of nominal oxygen excess and temperature using synchrotron and neutron powder diffraction, magnetometry and differential scanning calorimetry. Increase in oxygen excess leads to the structural transformations from the monoclinic structure (C2/c) to another monoclinic (P21/c), and then to the orthorhombic (Pnma) structure through the two-phase regions. The sequence of the structural transformations is accompanied by a modification of the … Show more

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Cited by 4 publications
(2 citation statements)
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“…gr. C2/c, which is specific for the extreme compound BiMnO3 [14,24] (see the Supplementary Materials, Tables S3 and S4). Temperature-dependent diffraction data as well as DSC results recorded for the compound with x = 0.7, i.e., with a single-phase monoclinic structure, point at the phase transition to the antipolar orthorhombic state at temperatures above 650 K (Figures 3 and 4, insets).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…gr. C2/c, which is specific for the extreme compound BiMnO3 [14,24] (see the Supplementary Materials, Tables S3 and S4). Temperature-dependent diffraction data as well as DSC results recorded for the compound with x = 0.7, i.e., with a single-phase monoclinic structure, point at the phase transition to the antipolar orthorhombic state at temperatures above 650 K (Figures 3 and 4, insets).…”
Section: Resultsmentioning
confidence: 99%
“…Chemical substitution of Mn 3+ ions for Fe 3+ ions in BiFeO 3 causes a decrease in the temperature of the magnetic transition [13], which is accompanied by a transformation of the magnetic state from the antiferromagnetic to the long-range ferromagnetic one. Thus, the magnetic structure of the compounds changes upon the chemical substitution from the G-type antiferromagnetic one (BiFeO 3 ), having spiral modulation, to the ferromagnetic structure, caused by the ordering of Mn d z 2 orbitals (BiMnO 3 ) [14,15].…”
Section: Introductionmentioning
confidence: 99%