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Gibbs, Alexandra S.; Arnold, Donna C.; Knight, Kevin S.; Lightfoot, Philip

doi:10.1103/physrevb.87.224109

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…BiFe 0.7 Mn 0.3 O 3 ceramic compounds were prepared from stoichiometric mixtures of the simple oxides Bi 2 O 3 , Fe 2 O 3 , and Mn 2 O 3 using a high-pressure, high-temperature method at 6 GPa and 1400 K, respectively, annealed for 90 min in Au capsules [28]. Note that the synthesis of BiFe 0.7 Mn 0.3 O 3 ceramics at an ambient pressure using a conventional ceramic method produces a different crystal structure modification [28,29]. The mentioned synthesis conditions allowed a preparing of ceramic compound with an average size of the crystallites of about several hundred nanometers.…”

Section: Methodsmentioning

confidence: 99%

Temperature-Driven Transformation of the Crystal and Magnetic Structures of BiFe0.7Mn0.3O3 Ceramics

et al. 2022

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The compound BiFe0.7Mn0.3O3 consisting at room temperature of coexistent anti-polar orthorhombic and polar rhombohedral phases has a metastable structural state, which has been studied by laboratory X-ray, synchrotron and neutron diffraction, magnetometry, differential thermal analysis, and differential scanning calorimetry. Thermal annealing of the sample at temperatures above the temperature-driven phase transition into the single phase rhombohedral structure (~700 K) causes an increase of the volume fraction of the rhombohedral phase at room temperature from ~10% up to ~30%, which is accompanied by the modification of the magnetic state, leading to strengthening of a ferromagnetic component. A strong external magnetic field (~5 T) applied to the sample notably changes its magnetic properties, as well as provides a reinforcement of the ferromagnetic component, thus leading to an interaction between two magnetic subsystems formed by the antiferromagnetic matrix with non-collinear alignment of magnetic moments and the nanoscale ferromagnetic clusters coexisting within it. The modification of the structural state and magnetic properties of the compounds and a correlation between different structural and magnetic phases are discussed focusing on the effect of thermal annealing and the impact of an external magnetic field.

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Section: Methodsmentioning

confidence: 99%

Temperature-Driven Transformation of the Crystal and Magnetic Structures of BiFe0.7Mn0.3O3 Ceramics

et al. 2022

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“…In this work, only the crystallographic structural refinement was carried out. A systematic magnetic structure analysis, as has been performed with HRPD data [36], was not viable with the current data due to the use of a 30-130 ms time-of-flight range in the interests of high-quality structural investigations [37,38].…”

Section: A High-resolution Neutron Powder Diffractionmentioning

confidence: 95%

Disentangling the phase sequence and correlated critical properties in Bi0.7La0.3FeO3 by structural studies

et al. 2021

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This work addresses the study of the high-temperature phase sequence of Bi 0.7 La 0.3 FeO 3 by undertaking temperature-dependent high-resolution neutron powder diffraction (NPD) and Raman spectroscopy measurements. A determination of lattice parameters, phase fractions, and modulation wave vector was performed by Pawley refinement of the NPD data. The analysis revealed that Bi 0.7 La 0.3 FeO 3 exhibits an incommensurate modulated orthorhombic Pn2 1 a(00γ )000 structure at room temperature, with a weak ferromagnetic behavior, likely arising from a canted antiferromagnetic ordering. Above T 1 = 543 K, the low-temperature modulated Pn2 1 a(00γ )000 evolves monotonically into a fractionally growing Pnma structure up to T N = 663 K. At 663 K, the low-temperature canted antiferromagnetic phase is suppressed concurrently with the switching of the former into a nonmodulated Pn2 1 a structure that continues to coexist with the Pnma one, until the latter is expected to reach the 100% fraction of the sample volume at high temperatures above 733 K. The Pn2 1 a space group is obtained from the Pnma one through the − 4 polar distortion. Neutron diffraction and Raman spectroscopy results provide evidence for the emergence of noteworthy linear spin-phonon coupling. In this regard, magnetostructural coupling is observed below T N , revealed by the relation between the weak ferromagnetism of the canted iron spins and the FeO 6 octahedra symmetric stretching mode. The correlation between magnetization and structural results from NPD provides definite evidence for the magnetic origin of the structural modulation. The analysis of the temperature-dependent magnetization and the magnetic peak intensity as well yields a critical exponent (β) value of 0.38. The lower limit of the phase coexistence temperature T 1 = 543 K, marking the emergence of the Pnma phase, is also associated with the temperature whereupon the modulation magnitude starts to decrease.

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“…There is a lot of interest in improving the practical properties of BiFeO 3 by chemical doping, to enhance, for example, the chemical and electronic performance [8,9]. One approach that has been widely explored is to substitute the octahedrallycoordinated Fe 3+ cations by trivalent transition metals such as Mn 3+ [10]. There have also been studies of doping on the 12-coordinated Bi 3+ site by trivalent rare-earth elements [11].…”

Section: Introductionmentioning

confidence: 99%

“…To understand the phase transitions in BiFeO 3 and their mechanisms it is necessary to have experimental access to the higher-symmetry phases, and this appears to be feasible with Sr-doped BiFeO 3 , with the advantage that we have both temperature and composition as variables. In this paper we present the results from a systematic study of the atomic and magnetic structures of Sr-doped BiFeO 3 , Sr x Bi 1−x FeO 3−x/2 10 . Using neutron powder diffraction, we study the variation of atomic and magnetic structures with both composition and temperature.…”

Section: Introductionmentioning

confidence: 99%

Neutron powder-diffraction study of phase transitions in strontium-doped bismuth ferrite: 1. Variation with chemical composition

Zhengzheng

Tan

Huang

et al. 2022

J. Phys.: Condens. Matter

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We report results from a study of the crystal structure of strontium-doped BiFeO3 using neutron powder diﬀraction and the Rietveld method. Measurements were obtained over a wide range of temperatures from 300–800 K for compositions between 10–16% replacement of bismuth by strontium. The results show a clear variation of the two main structural deformations – symmetry-breaking rotations of the FeO6 octahedra and polar ionic displacements that give ferroelectricity – with chemical composition, but relatively little variation with temperature. On the other hand, the antiferromagnetic order shows a variation with temperature and a second order phase transition consistent with the classical Heisenberg model. There is, however, very little variation in the behaviour of the antiferromagnetism with chemical composition, and hence with the degree of the structural symmetry-breaking distortions. We therefore conclude that there is no signiﬁcant coupling between antiferromagnetism and ferroelectricity in Sr-doped BiFeO3 and, by extension, in pure BiFeO3.

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High-temperature phases of multiferroic BiFe0.7Mn0.3O3

Cited by 4 publications

References 26 publications

Temperature-Driven Transformation of the Crystal and Magnetic Structures of BiFe0.7Mn0.3O3 Ceramics

Temperature-Driven Transformation of the Crystal and Magnetic Structures of BiFe0.7Mn0.3O3 Ceramics

Disentangling the phase sequence and correlated critical properties in Bi0.7La0.3FeO3 by structural studies

Neutron powder-diffraction study of phase transitions in strontium-doped bismuth ferrite: 1. Variation with chemical composition

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