Structural, electrical, and magnetic properties in the system BaxLa1–xCoO3

Patil, Sujata; Keer, H. V.; Chakrabarty, D. K.

doi:10.1002/pssa.2210520240

Cited by 49 publications

(27 citation statements)

References 14 publications

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“…But in some cases only one polarity of the current was used for the experiments, thus measuring either p+ or p-. See- decreases, and for x > 0.30 the crystal symmetry is cubic, in good agreement with data reported in the literature [16].…”

Section: Experimental Descriptionssupporting

confidence: 89%

“…On the other hand, less attention has been paid to the Ca-and Ba-doped compounds, although it is also known that their properties show a similar trend as the Sr-doped materials [11][12][13]16] even if the evolution is affected by the nature of the divalent cation [11].…”

Section: Introductionmentioning

confidence: 96%

“…For example, in the case of the Ba-doped cobaltites although the properties of the end members of the series Lal_xBaxCoO 3 (0 < x < 0.50) are well established [17,18], different magnetic and electrical behaviors have been reported for the intermediate degrees of doping [12,16,19].…”

Section: Introductionmentioning

confidence: 96%

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Anomalous electrical behavior in ferromagnetic La1−xBaxCoO3−δ materials (0<x≤0.50)

Breijo

Castro‐García

Señarı́s-Rodrı́guez

et al. 1999

Ionics

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Abstract. We prepared in this work Lal.xBaxCoO3_5 (0 < x < 0.50) compounds using the nitrate decomposition method, and focus in the study of the transport properties of the ferromagnetic compounds (x > 0.15, T c -200 K) in the temperature range 77 K < T < 300 K.We find that while for x < 0.20 these materials show semiconducting behavior, their electrical conduction being dominated by small-polaron holes, for x > 0.20 they show metallic behavior for T > 100 K, with a transition to semiconducting behavior being observed for T < 100 K. For x = 0.20, small changes in the oxygen stoichiometry of the samples -due to slight variations in the thermal treatments -greatly affect the transport properties of the materials that can show either two metal-insulator transitions as the temperature increases or a semiconducting behavior. Very interestingly all these ferromagnetic samples are very sensitive to the polarity of the applied electrical current, and display peculiar "diodic" behaviors.All these observations are explained on the basis of an inhomogeneous electronic structure in the Ba-doped cobalt perovskites.

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Section: Experimental Descriptionssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 96%

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Anomalous electrical behavior in ferromagnetic La1−xBaxCoO3−δ materials (0<x≤0.50)

Breijo

Castro‐García

Señarı́s-Rodrı́guez

et al. 1999

Ionics

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“…Chimica Techno Acta tortion in the range 0.0≤х<0.5 [94][95][96]99] and the oxides with 0.5 ≤ х < 0.65 (M = Sr) и 0.5 ≤ х ≤ 0.8 (M = Ba) have ideal cubic structure. A further increase in the strontium content of 0.65 ≤ х ≤ 0.8 leads to the appearance of orthorhombic distortions of the cubic structure [94].…”

Section: № 4 | 2015mentioning

confidence: 99%

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

et al. 2015

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Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of.Review is dedicated studies of phase equilibria in the systems based on rare earth elements and 3d transition metals. It's highlighted several structural families of these compounds and is shown that many were found interesting properties for practical application, such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases, the high mobility in the oxygen sublattice and more.Keywords: phase equilibrium; manganites; isobaric-isothermal diagrams; solid solutions © Cherepanov V. A., Gavrilova L. Ya., Volkova N. E., Urusova A. S., Aksenova T. V., Kiselev E., 2015 IntroductionThe studies of phase equilibria in the systems based on rare earth elements and 3d transition metals and thermodynamic parameters of the oxide phases formed in these systems was initiated by Vladimir Mikhailovich Zhukovsky in 1977 under the direct supervision of Alexander Nikolaevich Petrov, as the development of contractual issues, conducted with an experienced company GIREDMET. The works on the study of the system Sm-Co-O and properties of oxide phases formed in system were then extended to other rare earth elements (REE) [1][2][3][4][5][6][7][8] and 3d transition metals [9][10][11][12][13]. A characteristic feature of these systems is the formation of oxide phases with perovskite structure AVO 3 and related. The partial substitution of rare earth elements in alkaline earth metals (AEM) leads to significant change of properties and they found a wide range of interesting for practical applications of the properties such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases and a variety of redox reactions, high mobility in the oxygen sublattice and more. In addition, partial substitution in the A-sublattice under constant 3d-cation in the systems Ln-T-O allows to stabilize the structure, which Cherepanov V. A., Gavrilova L. Ya., Volkova N. E., Urusova A. S., Aksenova T. V., Kiselev E. in the given conditions (temperature and oxygen pressure) are thermodynamically unstable. Therefore, further development of investigations of phase equilibria and thermodynamic stability of complex oxides were targeting the systems Ln-M-T-O (where Ln = REE, M = Ca, Sr, Ba; T = Mn, Fe, Co, Ni, Cu). When a certain percentage of similarity (in all possible formation of a phase with perovskite structure LnTO 3±d ) these systems still have a noticeable and distinctive features depending on the nature of the components. Phase equilibrium in systems with T = MnThe significant difference of perovskite phases in the manganese-containing systems Ln-Mn-O is that the oxygen content in them exceeds the stoichiometric air LnMnO 3+d . In fact, the oxygen sublattice is complete and the non-stoichiometry is realized by vacancy disordering ...

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“…Transport and magnetic properties of barium doped LaCoO 3 compound has been studied by several authors. [25][26][27][28][29][30] Mandal et al have studied the temperature dependent Seebeck coefficient of this compound up to 335 K. To the best of our knowledge, the high temperature thermopower behavior of La0.75Ba0.25CoO3 compound has not been explored so far. Also, the detailed study of TE properties of this compound using electronic band structure is still lacking in the literature.…”

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confidence: 99%

An important role of temperature dependent scattering time in understanding the high temperature thermoelectric behavior of strongly correlated system: La_0.75Ba_0.25CoO₃

Singh

Kumar

Pandey

2017

J. Phys.: Condens. Matter

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In the present work, we have reported the temperature dependent thermopower (α) behavior of La0.75Ba0.25CoO3 compound in the temperature range 300-600 K. Using the Heikes formula, the estimated value of α corresponding to high-spin configuration of Co 3+ and Co 4+ ions is found to be ∼16 µV/K, which is close to the experimental value, ∼13 µV/K, observed at ∼600 K. The temperature dependent TE behavior of the compound is studied by combining the WIEN2K and BoltzTrap code. The self consistency field calculations show that the compound have ferromagnetic ground state structure. The electronic structure calculations give half metallic characteristic with a small gap of ∼50 meV for down spin channel. The large and positive value for down spin channel is obtained due to the unique band structure shown by this spin channel. The temperature dependent relaxation time for both the spin-channel charge carriers is considered to study the thermopower data in temperature range 300-600 K. An almost linear values of τup and a non-linear values of τ dn are taken into account for evaluation of α. By taking the temperature dependent values of relaxation time for both the spin channels, the calculated values of α using two current model are found to be in good agreement with experimental values in the temperature range 300-600 K. At 300 K, the calculated value of electrical conductivity by using the same value of relaxation time, i.e. 0.1 ×10 −14 seconds for spin-up and 0.66 ×10 −14 seconds for spin-dn channel, is found to be equal to the experimentally reported value.

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Structural, electrical, and magnetic properties in the system BaxLa1–xCoO3

Cited by 49 publications

References 14 publications

Anomalous electrical behavior in ferromagnetic La1−xBaxCoO3−δ materials (0<x≤0.50)

Anomalous electrical behavior in ferromagnetic La1−xBaxCoO3−δ materials (0<x≤0.50)

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

An important role of temperature dependent scattering time in understanding the high temperature thermoelectric behavior of strongly correlated system: La_0.75Ba_0.25CoO₃

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Structural, electrical, and magnetic properties in the system BaxLa1–xCoO3

Cited by 49 publications

References 14 publications

Anomalous electrical behavior in ferromagnetic La1−xBaxCoO3−δ materials (0<x≤0.50)

Anomalous electrical behavior in ferromagnetic La1−xBaxCoO3−δ materials (0<x≤0.50)

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

An important role of temperature dependent scattering time in understanding the high temperature thermoelectric behavior of strongly correlated system: La0.75Ba0.25CoO3

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An important role of temperature dependent scattering time in understanding the high temperature thermoelectric behavior of strongly correlated system: La_0.75Ba_0.25CoO₃