Magnetically Driven Dielectric and Structural Behavior in Bi0.5La0.5FeO3

Kavanagh, Christopher M.; Goff, Richard J.; Daoud‐Aladine, A.; Lightfoot, Philip; Morrison, Finlay D.

doi:10.1021/cm302513q

Cited by 27 publications

(26 citation statements)

References 46 publications

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“…13). It seems that this feature is the result of structural transitions found recently in Bi 0.5 La 0.5 FeO 3 compound by Kavanagh et al [51]. The authors reported a significant increase in the Fe-O1-Fe angle with simultaneous decrease in the Fe-O2-Fe angle (where O1 denotes the axial oxygen and O2 is the equatorial oxygen) when temperature rises from 50 K to about 300 K. At higher temperature both angles do not alter and again start to increase above about 700 K.…”

Section: Magnetic Propertiessupporting

confidence: 54%

“…low temperature exhibits spin glass behavior and the temperature of irreversibility T irr was found to be shifted upwards with increasing x. Temperature dependences of magnetization of La 3+ doped (BiFeO 3 ) 0.5 (PbTiO 3 ) 0.5 show also a concentration-dependent anomaly at~250 K, which we relate after [51] to temperature-induced changes in the internal Fe-O-Fe angles.…”

Section: Discussionmentioning

confidence: 67%

“…The magnitude of the magnetization step was found to be dependent on the lanthanum doping level i.e., it is almost negligible for undoped (BiFeO 3 ) 0.5 (PbTiO 3 ) 0.5 compound, is apparent as a deviation from a monotonic decrease of the magnetization for the solution with x=0.1 reaching about 10 % of the total magnetization for (Bi 0.5 La 0.5 FeO 3 ) 0.5 (PbTiO 3 ) 0.5 compound. This behavior clearly demonstrates that La 3+ and Bi 3+ ions located in A-site of the bismuth ferrite structure are not equivalent because they have different displacement along a-axis resulting in anomalous orthorhombic distortion [51]. La-induced modifications of the structure of (Bi 1-x La x FeO 3 ) 0.5 (PbTiO 3 ) 0.5 solid solution has of course an impact on the Fe-O-Fe angles and thus strongly influence its magnetic ordering.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Dielectric and magnetic properties of (Bi1-xLaxFeO3)0.5(PbTiO3)0.5 ceramics prepared by high energy mechanochemical technique

et al. 2015

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Multiferroic (Bi 1-x La x FeO 3 ) 0.5 (PbTiO 3 ) 0.5 ceramics with x = 0, 0.1, 0.2, 0.3 and 0.5 was prepared from mechanochemically synthesized nanopowders. The XRD studies revealed the tetragonal structure for x≤0.2 and rhombohedral for x=0.5 with mean grain sizes from 15 to 28 nm. Dielectric response of the compounds in the temperature range 125-525 K was found to contain two anomalies: at~400 K attributed to the presence of oxygen vacancies and that below 300 K characteristic of ferroelectric relaxors; the Curie point anomaly was apparent at 500 K only for samples with x=0.5. Analysis of the low-temperature response enabled us to characterize the relaxor state of the solid solution and to yield information on the decrease in the activation energy of dipole moment flipping in polar nanoregions. Magnetic studies revealed two contributions to the magnetization of the nanoceramics pointing to a coexistence of weak ferromagnetic and antiferromagnetic orderings in the range 4÷300 K. Low temperature variation of the magnetization in field-cooling and zero-field-cooling conditions revealed spin glass behavior which in (Bi 1-x La x FeO 3 ) 0.5 (PbTiO 3 ) 0.5 is dependent on x. Moreover, a sharp step in magnetization at~250 K was found to be dependent on the La content and related to the A-site distortion leading to a modification of Fe-O-Fe angles and antiferromagnetic coupling between magnetic Fe 3+ moments.

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Section: Magnetic Propertiessupporting

confidence: 54%

Section: Discussionmentioning

confidence: 67%

Section: Magnetic Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric and magnetic properties of (Bi1-xLaxFeO3)0.5(PbTiO3)0.5 ceramics prepared by high energy mechanochemical technique

et al. 2015

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“…The latter material displays some highly unusual features in its structural behavior versus temperature 16 . In particular, the most significant macroscopic feature is a dramatic plateauing of the expansivity of the c-axis (not the a-axis) below T N .…”

Section: Thermal Evolution Of Bond Lengths/angles and Symmetry-adaptementioning

confidence: 99%

“…Bi 0.5 La 0.5 FeO 3 (BLFO) 16 . This compound was studied as a comparison to the important multiferroic perovskite BiFeO 3 , which we had shown to undergo a transition to a paraelectric, but unstable, GdFeO 3 -like structure at its ferroelectric T C…”

Section: Introductionmentioning

confidence: 99%

Thermal evolution of the crystal structure of the orthorhombic perovskite LaFeO3

Dixon¹,

Kavanagh²,

Knight³

et al. 2015

Journal of Solid State Chemistry

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Thermal evolution of the crystal structure of the orthorhombic perovskite LaFeO 3 , Journal of Solid State Chemistry, http://dx.doi.org/10.1016/j.jssc. 2015.07.019 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe thermal evolution of the crystal structure of the prototypical orthorhombic perovskite LaFeO 3 has been studied in detail by powder neutron diffraction in the temperature range 25 < T < 1285 K. A conventional bond length/bond angle analysis, combined with an analysis in terms of symmetry-adapted modes, allows key aspects of the thermal behavior to be understood. In particular, the largest-amplitude symmetry modes (viz. in-phase and out-of-phase octahedral tilts, and A-site cation displacements) are shown to display relatively 'normal' behavior, increasing with decreasing temperature, which contrasts with the anomalous behavior previously shown by the derivative Bi 0.5 La 0.5 FeO 3 .However, an unexpected behavior is seen in the nature of the intra-octahedral distortion, which is used to rationalize the unique occurrence of a temperature dependent crossover of the a and c unit cell metrics in this compound.

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Enhancing Phase Transition Temperature in Novel Crown Inclusion Materials through Anion‐Substitution Engineering

Cai,

Hua,

Shi

et al. 2024

ChemistrySelect

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Host‐guest inclusion materials serve as an ideal model for designing phase transition materials. The typical host molecule, 18‐crown‐6 (1, 4, 7, 10, 13, 16‐hexaoxacyclo‐octadecane), is known for its strong coordination with amino compounds through N−H⋅⋅⋅O hydrogen‐bonding interactions, attracting the attention of numerous scientific researchers. This study presented the successful synthesis and characterization of two host‐guest inclusion materials, [(trans‐4‐aminocyclohexanol)(18‐crown‐6)][ClO4] (1) and [(trans‐4‐aminocyclohexanol)(18‐crown‐6)][BF4] (2). Both compounds 1 and 2 underwent reversible phase changes at temperatures of 312 K/305 K and 322 K/314 K, respectively. In this article, crystal structures, thermal properties, optical properties and analyses of intermolecular interactions were discussed in details. Our endeavors are believed to have made a contribution to the advancement of phase change materials.

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Magnetically Driven Dielectric and Structural Behavior in Bi_0.5La_0.5FeO₃

Cited by 27 publications

References 46 publications

Dielectric and magnetic properties of (Bi1-xLaxFeO3)0.5(PbTiO3)0.5 ceramics prepared by high energy mechanochemical technique

Dielectric and magnetic properties of (Bi1-xLaxFeO3)0.5(PbTiO3)0.5 ceramics prepared by high energy mechanochemical technique

Thermal evolution of the crystal structure of the orthorhombic perovskite LaFeO3

Enhancing Phase Transition Temperature in Novel Crown Inclusion Materials through Anion‐Substitution Engineering

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