Structural studies and magnetic and transport properties of Cr-substituted La0.67Ba0.33Mn1−xCrxO3 (0≤x≤0.15) perovskites

Peña, O.; Kallel, Sami; Guizouarn, Thierry; Oumezzine, M.

doi:10.1016/j.jallcom.2012.04.026

Cited by 19 publications

(5 citation statements)

References 43 publications

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“…This is in line with the fact that the ionic radius of Cr 3þ (0.615 Å ) is smaller than that of Fe 3þ (0.645 Å ), which has also been confirmed in Cr-doped BiFeO 3 compound and Cr-doped GaFeO 3 thin films. [30][31][32][33] Moreover, the lattice constants a, b, and c nearly drop linearly as the Cr doping content rises, which can be closely described by Vegard's law as the solid lines in Fig. 2(c), in good agreement with the reports available in literatures.…”

Section: Resultssupporting

confidence: 89%

“…2(c), in good agreement with the reports available in literatures. [30][31][32][33] These results reflect that the microstructures of the BTCFO ceramic are closely dependent on the Cr-doping content, and further reveal that Cr ions are incorporate into the BTFO lattice. In addition, the lattice distortion a/b for Aurivillius family with different Cr-doping concentration are also exhibited in Fig.…”

Section: Resultsmentioning

confidence: 63%

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The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

Liu¹,

Bai²,

Yang³

et al. 2013

Journal of Applied Physics

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Aurivillius Bi5Ti3FeO15 (BTFO) multiferroic ceramics with different Cr-doped concentrations have been synthesized by the conventional solid state reaction method. The influences of Cr-doping concentrations on the structural, magnetic, dielectric, and ferroelectric properties of BTFO ceramics are investigated in detail. All these sintered Cr-substituted BTFO ceramics are determined to be layered perovskite Aurivillius structure by X-ray diffraction, as well as the lattice parameters a, b, and c are in good accordance with Vegard's law along with the Cr-doping concentration. The lattice distortion a/b for Aurivillius family decreases with increasing Cr-doping concentration. Moreover, Cr-doping can promote greatly the grain growth of BTFO samples confirmed from field emission scanning electron microscopy characterization. However, no obvious signs of the improvement in ferroelectric properties are found in Cr-doped BTFO ceramics, and abnormal ferroelectric polarization versus electric field (P-E) loops are observed as Cr-doping content is beyond 0.1. Similar ε (tanδ) versus frequency plots to those of the BTFO sample are exhibited when Cr-doping concentration is less than 0.1. Nevertheless, obvious dielectric dispersion phenomena are shown as the Cr-doping concentration is beyond 0.1, and this dispersion behavior becomes strong with further increasing Cr-doping concentration, which are clearly indicated by the appearance of dielectric loss relaxation peaks in the measurement frequency from 102 Hz to 106 Hz. In addition, the corresponding frequency to relaxation peak shifts towards high frequencies with the Cr-doping concentration. Finally, the same magnetic orderings for all these Cr-doped BTFO ceramics as those of the BTFO one, i.e., superparamagnetic state dominated with antiferromagnetic interaction, are unambiguously found, signifying that the predicted Fe3+-O-Cr3+ 180° ferromagnetic superexchange interaction based on the Goodenough-Kanamori (G-K) rule might not be achieved in BTFO ceramics through Cr substitution by the conventional solid state reaction.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 63%

The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

Liu¹,

Bai²,

Yang³

et al. 2013

Journal of Applied Physics

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“…The structure parameter values determined for La 0.7 Ba 0.2 Ca 0.1 Mn 0.9 Cr 0.1 O 3 compound are in good agreement with those reported in the literature [11]; The unit cell volume decrease with increasing Cr substitution. A decrease in the rhombohedral lattice volume with an increase in Cr concentration from x = 0.00 to x = 0.15 is explained by the replacement of Mn 3+ ions (r 3+ Mn = 0.645Å) by smaller Cr 3+ ions (r 3+ Cr = 0.615Å) [12].…”

Section: Crystal Structuresupporting

confidence: 89%

Chromium Effects on the Structural and Electrical Properties in La0.7Ba0.2Ca0.1Mn1−x Cr x O3

Cherif

Belkahla

Dhahri

et al. 2015

J Supercond Nov Magn

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In this paper, we study the structural and electrical properties of the perovskite manganite La 0.7 Ba 0.2 Ca 0.1 Mn 1−x Cr x O 3 , synthesized by the solid-state reaction method. The Rietveld refinement of X-ray diffraction data indicates that there is no structural change owing to Cr substitution in La 0.7 Ba 0.The conductivity of all samples was measured as a function of frequency in the range between 40 and 10 6 Hz and a temperature ranging from 160 to 300 K. The ac conductance spectrum is found to obey the Jonscher universal power law: G ac = G dc +Aω n . The variation of the conductivity exponent (n) with temperature confirms the presence of hopping in the conduction process. According to dc conductance study, electronic conduction is found to be dominated by thermally activated hopping. The Cr content affects the activation energy (E a ). Its values decrease from E a = 72 meV for x = 0 to E a = 34 meV for x = 0.15.

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“…Perovskite-type structure oxides capable of high electrical conductivity, high dielectric constant, and high catalytic activity have been intensely sought for urgent applications in cathode materials, gas sensors, and new catalysts [1][2][3]. The unique physical and chemical properties of perovskite oxides depend upon the different types and contents of metals occupying in the A and B sites [4,5]. Although the focus of interest has primarily rested with the hole-doped perovskite oxides, naturally many researches have placed emphasis on electron-doped compounds [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Infrared Emittance and Electrical Properties of Ce4+ Doped Sm0.5Sr0.5CoO3 Ceramics

Chen

Wang

Sun

et al. 2019

SSP

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A series of Sm0.5Sr0.5CoO3-CeO2 ceramics formed by solid state-reaction method have been systematically investigated. The effects of doping the Sm site of Sm0.5Sr0.5CoO3 with Ce4+ on the structural, spectral reflectance, and thermal radiation properties were also explored. The modification of the initial phase takes place can be ascribed to the dissolution of Ce from initial CeO2 into the perovskite structure. The conductivity behavior depends critically on the Ce doping level, as was demonstrated that the recombination of holes (from Sm0.5Sr0.5CoO3) and electrons (from ceria ion) could decrease electrical conductivity. Sm0.5Sr0.5CoO3-CeO2 ceramics showed continuously adjustable conductivity and infrared emittance, opening up possible applications in solar thermal conversion or thermosensitive conductivity.

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Structural studies and magnetic and transport properties of Cr-substituted La0.67Ba0.33Mn1−xCrxO3 (0≤x≤0.15) perovskites

Cited by 19 publications

References 43 publications

The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

Chromium Effects on the Structural and Electrical Properties in La0.7Ba0.2Ca0.1Mn1−x Cr x O3

Infrared Emittance and Electrical Properties of Ce<sup>4+</sup> Doped Sm<sub>0.5</sub>Sr<sub>0.5</sub>CoO<sub>3</sub> Ceramics

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