The two-phase crystal structure and magnetic properties of the LaCo1−x FexO3−d system

Troyanchuk, I. O.; Karpinskii, D. V.; Dobryanskii, V. M.; Fedotova, Julia; Szymczak, H.

doi:10.1134/1.1995795

Cited by 18 publications

(19 citation statements)

References 14 publications

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“…(0.74 Å ) species in the octahedral sites of the perovskite frame work. Similar tendency have been found previously for samples with, LaCo x Fe 1-x O 3 [40,41]. The refined structural parameters of LaCr 1-x Co x O 3 (with 0 B x B 0.5) are reported in Table 1.…”

Section: Phase Characterization Of the Lacr 12x Co X O 3 Catalysts Posupporting

confidence: 80%

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Madoui

Omari

2016

J Inorg Organomet Polym

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Perovskite LaCr 1-x Co x O 3 (0 B x B 0.5) oxides synthesized by co precipitation method were investigated. X-ray diffraction, thermo gravimetric and differential thermal analysis, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM) and electrochemical measurements, were used to characterize the structure, morphology, electrochemical properties of the samples. The studied compounds have orthorhombic and rhombohedral systems in the ranges (0 B x B 0.2) and (0.3 B x B 0.5) respectively. Thermal analysis results indicate that the pure phase was obtained at temperature above 800°C. The structure and morphology of the samples characterized by SEM measurements indicate that particles have nearly spherical shapes and are agglomerated. The electrochemical measurements indicate that the catalytic activity is strongly influenced by cobalt doping. The highest electrode performance is achieved with large cobalt content.

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Section: Phase Characterization Of the Lacr 12x Co X O 3 Catalysts Posupporting

confidence: 80%

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Madoui

Omari

2016

J Inorg Organomet Polym

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“…1 and are consistent with other reports. 15,[17][18][19][20] For the powder samples, the neutron-diffraction measurements were carried out from 12 to 300 K using time-of-flight machine NPDF at Los Alamos National Laboratory. The samples were sealed in a vanadium can with helium as the exchange gas and loaded in a displex refrigeration system.…”

Section: Methodsmentioning

confidence: 99%

“…LaCo 1−y Fe y O 3 is paramagnetic at y Ͻ 0.4 and becomes magnetically ordered above y Ͼ 0.4. 18,19 From neutron powder diffraction refinement, it has been suggested that the magnetic structure is a G-type AFM, similar to LaFeO 3 . 18 The 10 unlike in the case of hole doping, thus B-site doping is not expected to induce significant distortions to the lattice from the ionic size mismatch.…”

Section: Introductionmentioning

confidence: 99%

Nature of magnetoelastic coupling with the isovalent substitution at the B-site inLaCo1−yByO3

Yu¹,

Kamazawa²,

Louca³

2010

Phys. Rev. B

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The influence of magnetic ion doping on the interplay of the lattice with magnetic phase separation in the LaCo 1−y B y O 3 ͑B=Ni or Fe, y = 0.1, 0.4͒ class of cobalites has been investigated via neutron-scattering techniques. The substitution of either Ni 3+ ͑3d 7 ͒ or Fe 3+ ͑3d 5 ͒ does not alter the crystal symmetry which remains rhombohedral, R3c, at all temperatures. With doping, the degree of cooperative octahedral rotations about the ͑111͒ axis increases, but it is only with Ni that such a rotation is accompanied by a compression along the trigonal axis. The observed crystal distortion is invoked to break the degeneracy of the magnetic Co 3+ ions while maintaining the Co-O bonds at a constant length. This is distinctly different from the changes observed with hole doping. The absence of two distinct types of Co-O bond lengths in the local structure with the substitution of Fe 3+ or Ni 3+ for Co 3+ ͑3d 6 ͒ is indicative that, unlike in the hole-doped cobaltites with Ba 2+ or Sr 2+ previously studied, the intermediate-spin state of Co is either absent or suppressed. This leaves us to question the origin of the magnetic interactions, which most likely arises from a high-spin state of the Co ion. However, the absence of an antiferromagnetic signal originating from Co suggests that the interaction is not simply superexchange in nature.

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“…Thus, a LaCo 0.5 Ni 0.5 O 3 compound [10] shows a metallic behavior and has a unit-cell volume larger than that in the extreme compounds -LaCoO 3 and LaNiO 3 -confirming the spin-state transition. However, it is likely that the semiconducting system LaCo 1-x Fe x O 3 [11][12][13] does not exhibit the spin-state transition of Co ions in spite of the larger unit cell in comparison with the par- oxides were ground and calcined at 1420 K for 6 h. The calcined samples were then ground again, sintered at 1770 K for 2 h and cooled to room temperature at a slow rate. One synthesized sample was reduced in an evacuated quartz ampoule at T = 1200 K. Tantalum metal was used as an oxygen getter.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer and neutron‐diffraction studies of LaCo_0.42Fe_0.58O_3–d

Karpinsky¹,

Troyanchuk

Kopcewicz

2007

Physica Status Solidi (b)

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PACS 61.12. Ld, 72.80.Ga, 76.80.+ y Mössbauer, neutron powder diffraction and magnetization measurements have been performed for the LaCo 0.42 Fe 0.58 O 3-d compounds in the temperature range 4.2 K < T < 400 K. It was found that a stoichiometric compound has a canted G-type antiferromagnetic structure with T N ~ 380 K and magnetic moment of 2.3µ B per formula unit. Combined Mössbauer and neutron-diffraction data give evidence that only Fe 3+ ions are in the magnetically ordered state, whereas Co 3+ ones are in the nonmagnetic low-spin state and do not participate actively in the magnetic interactions. The oxygen loss leads to the reduction of Co ions down to the 2 + valence state keeping Fe ions in the 3 + valence state. At the same time the T N temperature increases and the weak ferromagnetic component is suppressed. Newly generated strong antiferromagnetic interactions Co 2+-O-Fe 3+ arise.

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The two-phase crystal structure and magnetic properties of the LaCo1−x FexO3−d system

Cited by 18 publications

References 14 publications

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Nature of magnetoelastic coupling with the isovalent substitution at the B-site inLaCo1−yByO3

Mössbauer and neutron‐diffraction studies of LaCo_0.42Fe_0.58O_3–d

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The two-phase crystal structure and magnetic properties of the LaCo1−x FexO3−d system

Cited by 18 publications

References 14 publications

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Nature of magnetoelastic coupling with the isovalent substitution at the B-site inLaCo1−yByO3

Mössbauer and neutron‐diffraction studies of LaCo0.42Fe0.58O3–d

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Mössbauer and neutron‐diffraction studies of LaCo_0.42Fe_0.58O_3–d