Structural stability and magnetic properties of Bi1−xLa(Pr)xFeO3 solid solutions |
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Authors: | D.V. Karpinsky I.O. Troyanchuk V.A. Khomchenko |
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Affiliation: | a CICECO/Department of Ceramics and Glass Engineering, University of Aveiro, 3810-193 Aveiro, Portugalb SSPA “Scientific-Practical Materials Research Centre of the NAS of Belarus”, P. Brovka str. 19, 220072 Minsk, Belarusc CEMDRX/Department of Physics, Faculty of Sciences and Technology, University of Coimbra, 3004-516 Coimbra, Portugal |
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Abstract: | In this work, X-ray diffraction data taken on Bi1−xLaxFeO3 solid solutions are used to verify the following structural phase transitions: “polar rhombohedral-antipolar orthorhombic” at x≈0.16 and “commensurate-incommensurate” within the orthorhombic phase at x≈0.18. In contrast, in the Bi1−xPrxFeO3 series, the polar rhombohedral phase transforms into an antipolar orthorhombic one at x≥0.13. The polar rhombohedral phase near the morphotropic phase boundary exhibits an isothermal transformation into an antipolar orthorhombic phase, though the transformation occurs much faster in the case of La-doped compounds. The incommensurate structural phase was not detected in Bi1−xPrxFeO3 solid solutions. The ternary structural phase diagram is constructed for (Bi,La,Pr)FeO3 systems. In addition, the polar rhombohedral phase exhibits a magnetic field-induced transition from the modulated antiferromagnetic state into a homogeneous weak ferromagnetic state whereas the antipolar phase is a weak ferromagnetic state in the absence of an external field. |
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Keywords: | A. Multiferroics E. Morphotropic phase boundary F. Phase transition F. Phase diagram |
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