| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Gibbs, Alexandra S.
ISIS Neutron and Muon Source
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2022The crystal and defect structures of polar KBiNb 2 O 7
- 2022Low-intermediate-temperature, high-pressure thermoelastic and crystallographic properties of thermoelectric clausthalite (PbSe-I)citations
- 2022Competing spin-orbital singlet states in the 4d4 honeycomb ruthenate Ag3LiRu2O6citations
- 2022The crystal and defect structures of polar KBiNb2O7
- 2021Disorder-induced structural complexity in the barlowite family of S = 1/2 kagomé magnetscitations
- 2021Disentangling the phase sequence and correlated critical properties in Bi0.7La0.3FeO3 by structural studiescitations
- 2019Pressure-induced collapse of the spin-orbital Mott state in the hyperhoneycomb iridate β-Li2IrO3citations
- 2017Cation disorder and phase transitions in the structurally complex solar cell material Cu2ZnSnS4citations
- 2017Robust Bain distortion in the premartensite phase of a platinum-substituted Ni2MnGa magnetic shape memory alloycitations
- 2011High-temperature phase transitions of hexagonal YMnO3citations
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article
Disentangling the phase sequence and correlated critical properties in Bi0.7La0.3FeO3 by structural studies
Abstract
<p>This work addresses the study of the high-temperature phase sequence of Bi<sub>0.7</sub>La<sub>0.3</sub>FeO<sub>3</sub> 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<sub>0.7</sub>La<sub>0.3</sub>FeO<sub>3</sub> exhibits an incommensurate modulated orthorhombic Pn2<sub>1</sub>a(00γ)000 structure at room temperature, with a weak ferromagnetic behavior, likely arising from a canted antiferromagnetic ordering. Above T<sub>1</sub>=543K, the low-temperature modulated Pn2<sub>1</sub>a(00γ)000 evolves monotonically into a fractionally growing Pnma structure up to T<sub>N</sub>=663K. At 663 K, the low-temperature canted antiferromagnetic phase is suppressed concurrently with the switching of the former into a nonmodulated Pn2<sub>1</sub>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<sub>1</sub>a space group is obtained from the Pnma one through the Γ<sub>4</sub><sup>-</sup> 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<sub>N</sub>, revealed by the relation between the weak ferromagnetism of the canted iron spins and the FeO<sub>6</sub> 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<sub>1</sub>=543K, marking the emergence of the Pnma phase, is also associated with the temperature whereupon the modulation magnitude starts to decrease.</p>