Displacive Phase Transitions and Magnetic Structures in Nd-Substituted BiFeO<sub>3</sub>

Levin, Igor; Tucker, Matthew G.; Wu, Hui; Provenzano, V.; Dennis, Cindi L.; Karimi, Sarah; Comyn, T.P.; Stevenson, T.; Smith, Ronald I.; Reaney, Ian M.

doi:10.1021/cm1036925

Cited by 124 publications

(111 citation statements)

References 19 publications

(24 reference statements)

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“…The latter implies the "+ + −−" sequence for the corresponding axial vectors (Fig. 2) and has been observed before in some other perovskite systems such as NaNbO 3 [40], Bi 1−x Ln x FeO 3 (Ln = lanthanide) [12,[17][18][19], and BiFe 1−x Mn x O 3 [31].…”

Section: A Crystal and Magnetic Structures Of The Antipolar Phasesupporting

confidence: 78%

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Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

et al. 2014

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A metastable perovskite BiFe 0.5 Sc 0.5 O 3 synthesized under high-pressure (6 GPa) and high-temperature (1500 K) conditions was obtained in two different polymorphs, antipolar P nma and polar I ma2, through an irreversible behavior under a heating/cooling thermal cycling. The I ma2 phase represents an original type of a canted ferroelectric structure where Bi 3+ cations exhibit both polar and antipolar displacements along the orthogonal [110] p and [110] p pseudocubic directions, respectively, and are combined with antiphase octahedral tilting about the polar axis. Both the P nma and the I ma2 structural modifications exhibit a long-range antiferromagnetic ordering with a weak ferromagnetic component below T N ∼ 220 K. Analysis of the coupling between the dipole, magnetic, and elastic order parameters based on a general phenomenological approach revealed that the weak ferromagnetism in both phases is mainly caused by the presence of the antiphase octahedral tilting whose axial nature directly represents the relevant part of Dzyaloshinskii vector. The magnetoelectric contribution to the spontaneous magnetization allowed in the polar I ma2 phase is described by a fifth-degree free-energy invariant and is expected to be small.

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Section: A Crystal and Magnetic Structures Of The Antipolar Phasesupporting

confidence: 78%

“…One of the main doping strategies applied to BiFeO 3 is focused on lanthanum [12][13][14] or rare-earth substitution of Bi [15][16][17][18][19]. This makes it possible to keep the charge balance without changing the charge state of the Fe sublattice or oxygen stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

et al. 2014

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“…15 compounds It should be noted that the structural transformation into the non-polar orthorhombic state observed in the Pr-doped compounds is significantly different from those attested for BiFeO 3 compounds doped with other rare-earth elements [10][11][12]17]. In the La-doped compound with similar phase ratio (at room temperature), the above-mentioned structural transition occurs via formation of the single phase state with rhombohedral symmetry [9,10,16].…”

Section: Three -Phase Coexistence Regionmentioning

confidence: 88%

Phase coexistence in Bi1−x Pr x FeO3 ceramics

et al. 2014

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Bi 1-x Pr x FeO 3 ceramics across the rhombohedral-orthorhombic phase boundary have been studied by X-ray diffraction, transmission electron microscopy and differential scanning calorimetry. The structural phase transitions in Bi 1-x Pr x FeO 3 driven by doping concentration and temperature are significantly different from those in BiFeO 3 compounds doped with other rareearth elements. The features of the structural transformations have been discussed based on the specific character of the chemical bonds associated with praseodymium ions. The detailed study of the crystal structure evolution clarified the ranges of both single phase and phase coexistence regions at different temperatures and dopant concentrations. For x=0.125 compound the threephase coexistence region has been observed in the narrow temperatures range about 400 o C. The results explicate driving forces of the structural transitions and elucidate the origin of the remarkable physical properties of BiFeO 3 -based compounds near the morphotropic phase boundary.

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“…It has been recognized that A-site lanthanide (Ln) substitution increases magnetic anisotropy in bismuth ferrite to make spatial modulation energetically unfavorable. 13,14 Though earlier publications devoted to multiferroic properties of the Bi 1 x Ln x FeO 3 perovskites suggest the possibility to combine weak ferromagnetism and ferroelectricity in the lanthanidemodified phases, 15 more recent works do not support this assumption and indicate that the doping-driven suppression of the cycloidal modulation resulting in the establishment of weak ferromagnetic (wF) state is accompanied by the destruction of the initial polar structure, maximum magnetization in the Bi 1 x Ln x FeO 3 series (M s $ 0.25 0.3 emu/g) being achieved only in the substitution-stabilized nonpolar phases [upon lanthanide substitution, the initial ferroelectric rhombohedral (R3c) AF phase typically transforms into the intermediate antiferroelectric orthorhombic (Pnam for Ln ¼ Pr, Nd, Sm [16][17][18] or Pnam and Imma(00c)s00 for Ln ¼ La 19,20 ) wF phase that, in turn, transforms into nonpolar orthorhombic (Pnma) wF phase characteristic of LnFeO 3 orthoferrites]. Decreasing ionic radius of a substituting lanthanide shifts phase boundaries of the doping-induced transitions toward smaller x (for the R3c !…”

Section: Introductionmentioning

confidence: 99%

Mn substitution-modified polar phase in the Bi1−xNdxFeO3 multiferroics

Khomchenko

Karpinsky

Pereira³

et al. 2013

Journal of Applied Physics

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Room-temperature crystal structure and multiferroic properties of the Bi 0.92 Nd 0.08 Fe 1 x Mn x O 3 (x 0.3) ferromanganites have been studied to reveal the effect of Mn doping on the magnetic and ferroelectric behaviors of the lanthanide-modified compound representing a polar (space group R3c) predominantly antiferromagnetic phase of the Bi 1 x Ln x FeO 3 perovskites. B-site substitution tends to suppress existing polar displacements and induces a ferroelectric-to-antiferroelectric transition near x ¼ 0.2. The threshold concentration inducing the structural transformation does not coincide with that required to change the dominant magnetic interaction, so a weak ferromagnetic/ ferroelectric state unusual for the Bi 1 x Ln x FeO 3 and BiFe 1 x Mn x O 3 series appears in the intermediate concentration range near the polar/nonpolar phase boundary. V C 2013 AIP Publishing LLC.

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Displacive Phase Transitions and Magnetic Structures in Nd-Substituted BiFeO₃

Cited by 124 publications

References 19 publications

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

Phase coexistence in Bi1−x Pr x FeO3 ceramics

Mn substitution-modified polar phase in the Bi1−xNdxFeO3 multiferroics

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Displacive Phase Transitions and Magnetic Structures in Nd-Substituted BiFeO3

Cited by 124 publications

References 19 publications

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

Phase coexistence in Bi1−x Pr x FeO3 ceramics

Mn substitution-modified polar phase in the Bi1−xNdxFeO3 multiferroics

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Displacive Phase Transitions and Magnetic Structures in Nd-Substituted BiFeO₃