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Title: Structural, magnetic, and dielectric properties of solid solutions between BiMnO{sub 3} and YMnO{sub 3}

Abstract

Bi{sub 1−x}Y{sub x}MnO{sub 3} (0.1≤x≤0.9) solid solutions were prepared by the high-pressure high-temperature method at 6 GPa and 1573 K. They crystallize in the GdFeO{sub 3}-type perovskite structure with the Pnma symmetry. Crystal structures of Bi{sub 0.9}Y{sub 0.1}MnO{sub 3} and Bi{sub 0.5}Y{sub 0.5}MnO{sub 3} are studied by synchrotron X-ray powder diffraction at room temperature. Only one Néel temperature, T{sub N}, is found in samples with 0.1≤x≤0.9 in comparison with two Néel temperatures observed in YMnO{sub 3} (T{sub N}=29 and 39 K). Samples with 0.5≤x≤0.9 have almost constant T{sub N}=44 K, while T{sub N} starts to increase linearly for other compositions: T{sub N}=46 K for x=0.3, T{sub N}=58 K for x=0.2, and T{sub N}=68 K for x=0.1. Field-induced transitions from canted-antiferromagnetic states to antiferromagnetic states are detected at about 30 kOe for x=0.2 and 70 kOe for x=0.1. Dielectric constant increases below T{sub N} in samples with 0.5≤x≤1, while it decreases below T{sub N} in samples with 0.1≤x≤0.3. Our data suggest that a magnetic structure changes near x=0.4. By extrapolation, we could estimate lattice parameters (a=5.9221 Å, b=7.5738 Å, and c=5.4157 Å) and T{sub N}=79 K for a hypothetical Pnma modification of BiMnO{sub 3}. - Graphical abstract: Bi{sub 1−x}Y{sub x}MnO{sub 3}more » solid solutions were prepared in the whole compositional range by the high-pressure method. Magnetic and dielectric data suggest that a magnetic structure changes near x=0.4. No ferroelectric properties were found. - Highlights: • Orthorhombic Bi{sub 1−x}Y{sub x}MnO{sub 3} solid solutions are prepared by the high-pressure method. • Structural, magnetic, and dielectric properties are studied. • One Néel temperature is found in all the samples. • T{sub N}=44 K for x=0.5–0.9, 46 K for x=0.3, 58 K for x=0.2, and 68 K for x=0.1. • No ferroelectricity is observed.« less

Authors:
Publication Date:
OSTI Identifier:
22658160
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 246; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BISMUTH COMPOUNDS; DIELECTRIC PROPERTIES; FERROELECTRIC MATERIALS; LATTICE PARAMETERS; MAGNETIC PROPERTIES; MANGANATES; ORTHORHOMBIC LATTICES; PRESSURE RANGE MEGA PA 10-100; SOLID SOLUTIONS; X-RAY DIFFRACTION; YTTRIUM COMPOUNDS

Citation Formats

Belik, Alexei A., E-mail: Alexei.BELIK@nims.go.jp. Structural, magnetic, and dielectric properties of solid solutions between BiMnO{sub 3} and YMnO{sub 3}. United States: N. p., 2017. Web. doi:10.1016/J.JSSC.2016.10.025.
Belik, Alexei A., E-mail: Alexei.BELIK@nims.go.jp. Structural, magnetic, and dielectric properties of solid solutions between BiMnO{sub 3} and YMnO{sub 3}. United States. doi:10.1016/J.JSSC.2016.10.025.
Belik, Alexei A., E-mail: Alexei.BELIK@nims.go.jp. Wed . "Structural, magnetic, and dielectric properties of solid solutions between BiMnO{sub 3} and YMnO{sub 3}". United States. doi:10.1016/J.JSSC.2016.10.025.
@article{osti_22658160,
title = {Structural, magnetic, and dielectric properties of solid solutions between BiMnO{sub 3} and YMnO{sub 3}},
author = {Belik, Alexei A., E-mail: Alexei.BELIK@nims.go.jp},
abstractNote = {Bi{sub 1−x}Y{sub x}MnO{sub 3} (0.1≤x≤0.9) solid solutions were prepared by the high-pressure high-temperature method at 6 GPa and 1573 K. They crystallize in the GdFeO{sub 3}-type perovskite structure with the Pnma symmetry. Crystal structures of Bi{sub 0.9}Y{sub 0.1}MnO{sub 3} and Bi{sub 0.5}Y{sub 0.5}MnO{sub 3} are studied by synchrotron X-ray powder diffraction at room temperature. Only one Néel temperature, T{sub N}, is found in samples with 0.1≤x≤0.9 in comparison with two Néel temperatures observed in YMnO{sub 3} (T{sub N}=29 and 39 K). Samples with 0.5≤x≤0.9 have almost constant T{sub N}=44 K, while T{sub N} starts to increase linearly for other compositions: T{sub N}=46 K for x=0.3, T{sub N}=58 K for x=0.2, and T{sub N}=68 K for x=0.1. Field-induced transitions from canted-antiferromagnetic states to antiferromagnetic states are detected at about 30 kOe for x=0.2 and 70 kOe for x=0.1. Dielectric constant increases below T{sub N} in samples with 0.5≤x≤1, while it decreases below T{sub N} in samples with 0.1≤x≤0.3. Our data suggest that a magnetic structure changes near x=0.4. By extrapolation, we could estimate lattice parameters (a=5.9221 Å, b=7.5738 Å, and c=5.4157 Å) and T{sub N}=79 K for a hypothetical Pnma modification of BiMnO{sub 3}. - Graphical abstract: Bi{sub 1−x}Y{sub x}MnO{sub 3} solid solutions were prepared in the whole compositional range by the high-pressure method. Magnetic and dielectric data suggest that a magnetic structure changes near x=0.4. No ferroelectric properties were found. - Highlights: • Orthorhombic Bi{sub 1−x}Y{sub x}MnO{sub 3} solid solutions are prepared by the high-pressure method. • Structural, magnetic, and dielectric properties are studied. • One Néel temperature is found in all the samples. • T{sub N}=44 K for x=0.5–0.9, 46 K for x=0.3, 58 K for x=0.2, and 68 K for x=0.1. • No ferroelectricity is observed.},
doi = {10.1016/J.JSSC.2016.10.025},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 246,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2017},
month = {Wed Feb 15 00:00:00 EST 2017}
}
  • Crystal structures of solid solutions of BiMn{sub 1-x}Sc{sub x}O{sub 3} with x=0.05, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7 were studied with synchrotron X-ray powder diffraction. The strong Jahn-Teller distortion, observed in BiMnO{sub 3} at 300 K and associated with orbital order, disappeared already in BiMn{sub 0.95}Sc{sub 0.05}O{sub 3}. The orbital-ordered phase did not appear in BiMn{sub 0.95}Sc{sub 0.05}O{sub 3} down to 90 K. Almost the same octahedral distortions were observed in BiMn{sub 1-x}Sc{sub x}O{sub 3} with 0.05<=x<=0.7 at room temperature and in BiMnO{sub 3} at 550 K above the orbital ordering temperature T{sub OO}=473 K. These results allowed usmore » to conclude that the remaining octahedral distortions observed in BiMnO{sub 3} above T{sub OO} are the structural feature originated from the highly distorted monoclinic structure. - Graphical Abstract: Compositional dependence of octahedral distortion parameters DELTA(M1O{sub 6}) and DELTA(M2O{sub 6}) in solid solutions BiMn{sub 1-x}Sc{sub x}O{sub 3} at 300 K.« less
  • Highlights: ► Solid-solutions of (1−x)LaFeO{sub 3}–(x)PbTiO{sub 3} were synthesized by solid-state reaction. ► XRPD and NPD evidence orthorhombic (x < 0.7) and tetragonal (x > 0.8) crystal structures. ► LaFeO{sub 3}-rich compositions order antiferromagnetically (x < 0.6, G-type structure). ► PbTiO{sub 3}-rich compositions exhibit ferroelectric order (x larger than 0.8). ► Magnetic and dielectric (relaxor) ordering coexist near room-temperature around x = 0.4. -- Abstract: Solid solutions of (1−x)LaFeO{sub 3}–(x)PbTiO{sub 3} (0 < x < 1) have been prepared by conventional solid-state reaction. These complex perovskites have been studied by means of X-ray (XRPD) and neutron powder (NPD) diffraction, complementedmore » with dielectric, magnetic, heat capacity and Mössbauer measurements. Complete solubility in the perovskite series was demonstrated. The NPD and XRPD patterns were successfully refined as orthorhombic (x ≤ 0.7) and tetragonal (x ≥ 0.8). A composition-driven phase transformation occurs within the interval 0.7 < x < 0.8. The samples with x < 0.5 showed evidence of long-range magnetic ordering with an G-type antiferromagnetic arrangement of the magnetic moments of the Fe{sup 3+} cations in the B-site with propagation vector k = (0,0,0). Based on the obtained experimental data, a combined structural and magnetic phase diagram has been constructed. The factors governing the structural, dielectric and magnetic properties of (1−x)LaFeO{sub 3}–(x)PbTiO{sub 3} solid solutions are discussed, as well as their possible multiferroicity.« less
  • Highlights: • Mn{sub 3}TeO{sub 6} and Co{sub 3}TeO{sub 6} are antiferromagnets with corundum related structures. • The structural and magnetic properties of Mn{sub 3−x}Co{sub x}TeO{sub 6} ceramics were investigated. • All compounds adopt the trigonal structure of Mn{sub 3}TeO{sub 6} up to at least x = 2.4. • The antiferromagnetic transition temperature monotonously increases with x. • NPD data evidences the magnetic structure of the Mn{sub 3−x}Co{sub x}TeO{sub 6} ceramics. - Abstract: The effects of Co{sup 2+} doping on the structural, magnetic and dielectric properties of the multiferroic frustrated antiferromagnet Mn{sub 3}TeO{sub 6} have been investigated. Ceramic samples of themore » solid solution series Mn{sub 3−x}Co{sub x}TeO{sub 6} were prepared by a solid-state reaction route. X-ray and neutron powder diffraction and electron microscopy techniques were combined with calorimetric, dielectric and magnetic measurements to investigate the dependence of the crystal structure and physical properties on temperature and composition. It is shown that the compounds with x ≤ 2.4 adopt the trigonal corundum-related structure of pure Mn{sub 3}TeO{sub 6} (space group R3{sup ¯}) in the temperature range 5–295 K and that the lattice parameters a and c and the unit-cell volume V decrease linearly with increasing Co{sup 2+} concentration. The low-temperature magnetic susceptibility and heat capacity data evidence the antiferromagnetic ordering of all samples. The Neel temperature linearly increases with Co{sup 2+} concentration x. Curie–Weiss fits of the high temperature susceptibility indicate that the magnetic frustration decreases with x. The derived magnetic structure of Mn{sub 3}TeO{sub 6} can be described as an incommensurately modulated magnetic spin state with k = [0, 0, k{sub z}] and an elliptical spin-spiral order of spins within the chains of MnO{sub 6} octahedra. With increasing Co{sup 2+} concentration the propagation vector k{sub z} changes from 0.453 (x = 0) to 0.516 (x = 2.4). The magnetic anisotropy changes as well, leading to a reorientation of the spiral-basal plane. A possible coexistence of long-range order of electrical dipoles and magnetic moments in Mn{sub 3−x}Co{sub x}TeO{sub 6} is discussed.« less
  • Single phase Er substituted at A-site BiFeO{sub 3}−PbTiO{sub 3} solid solutions were synthesized using solid state reaction route. The calcinations at different temperature reveals that the single and pure tetragonal phase formation has been accomplished at 1000°C. The SEM micrographs did not show any distinguishable change in grain size. The dielectric studies established that the dielectric constant decreases and ferroelectric T{sub c} increases with increase in Er.
  • Perovskite-type compounds of general formula LaMn{sub 1{minus}x}Cu{sub x}O{sub 3} and LaCo{sub 1{minus}x}Cu{sub x}O{sub 3} (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) were prepared by calcining the citrate gel precursors at 823, 923, and 1073 K. The decomposition of the precursors was followed by thermal analysis and the oxides were investigated by means of elemental analysis (atomic absorption and redox titration), X-ray powder diffraction, BET surface area, X-ray absorption (EXAFS and XANES), electron microscopy (SEM and TEM), and magnetic susceptibility. LaMn{sub 1{minus}x}Cu{sub x}O{sub 3} samples are perovskite-like single phases up to x = 0.6. At x = 0.8 CuO andmore » La{sub 2}CuO{sub 4} phases are present in addition to perovskite. Magnetic susceptibility studies show a ferromagnetic behavior that decreases with increase in x. Materials with not very clear morphology and crystals with definite structure are distinguishable by SEM for samples calcined at 1073 and at 1273 K, respectively. TEM patterns, for samples calcined at 1073 K, evidence almost regular hexagonal prismatic crystals connected to form linked structures and some spotty crystals, suggesting short-range ordered local defects. For copper-containing samples, calcined at 1273 K, a higher degree of defectivity (probably associated with the interaction of anion vacancies) and the occurrence of planar faults are shown by TEM.« less