Short- and long-range order in La1−xSrxCoO3 and La1−xBaxCoO3

Ефимова, Е. А.; Ефимов, В. В.; Karpinsky, D. V.; Kuzmin, Alexei; Purans, J.; Sikolenko, V.; Tiutiunnikov, S. I.; Troyanchuk, I. O.; Welter, Edmund; Zając, D.; Simkin, V. G.; Sazonov, Andrew

doi:10.1016/j.jpcs.2008.03.040

Cited by 21 publications

(12 citation statements)

References 14 publications

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“…In fact, the structural data included also in the scheme, obtained from XRD (10) show a higher Co-Co distance in the Sr-substituted perovskite, compatible with a small expansion of the cell. This distance is closer to twice the Co-O distance in the [CoO 6 ] octahedron, showing that, as recognized recently by other authors [13], the Co-O-Co bond angle has increased, approaching the ideal 1801 in cubic structures. As a result, almost no distortion occurs in the rhombohedrical structure of the La 0.5 Sr 0.5 CoO 3À d substituted perovskite.…”

Section: Crystal Field Effects Upon Sr-substitutionsupporting

confidence: 73%

“…They are also interesting for their catalytic properties in the oxidation of hydrocarbon and soots, and the decomposition of nitrogen oxides [10]. Moreover, some authors have found that the low spin configuration of the LaCoO 3 perovskite at room temperature changes to a higher spin configuration by increasing the temperature or introducing Sr(II) atoms, also associated with changes in magnetic and conducting properties [11][12][13][14][15]. In spite of that, there is no general agreement about the origin of these relevant characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Chemical and electronic characterization of cobalt in a lanthanum perovskite. Effects of strontium substitution

Hueso

Holgado

Pereñíguez

et al. 2010

Journal of Solid State Chemistry

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Section: Crystal Field Effects Upon Sr-substitutionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Chemical and electronic characterization of cobalt in a lanthanum perovskite. Effects of strontium substitution

Hueso

Holgado

Pereñíguez

et al. 2010

Journal of Solid State Chemistry

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“…8) and the average value ω ≈ 5 • reported for Sr-and Ba-doped cobaltites, 30 we have evaluated that dT C /dP changes sign at cf /W ≈ 0.38. That is to say, dT C /dP >0 when the bandwidth W is large enough as compared to the e g -t 2g energy so that the t 2g level lies within the bandwidth of the e g electrons; therefore the population of the higher spin state does not decrease under pressure despite increasing cf .…”

Section: Inverse Pressure Effect On Ferromagnetic Transition In Comentioning

confidence: 95%

Ferromagnetic state of La1−xBaxCoO
Fita
¹
,
Szymczak
²
,
Puźniak
³

et al. 2011
Phys. Rev. B
27
1
19
0
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Pressure effect on magnetic properties of polycrystalline La 1−x Ba x CoO 3 (0.1 x 0.5) was studied by magnetization measurements in the temperature range 5-240 K, magnetic field up to 16 kOe, and under hydrostatic pressure up to 10.5 kbar. For low-doped cobaltites (x = 0.1,0.15), it was found that applied pressure enhances the ferromagnetic (FM) cluster phase, resulting in an increase of both spontaneous FM moment and transition temperature of clusters T cl C , while the freezing temperature T f lowers under pressure appreciably (dT f /dP ≈ −1.4 K/kbar), suggesting the weakening of interaction between clusters. For higher-doped La 1−x Ba x CoO 3 (0.2 x 0.5), having developed long-range FM order, the systematic increase of T C under pressure was observed with coefficient dT C /dP linearly increasing with doping up to 1.8 K/kbar at x = 0.5, the highest value reported for cobaltites. The positive value of the dT C /dP coefficient found for the Ba compound in a whole range of studied doping is in strong contrast to that found in Ca and Sr cobaltites, where the dT C /dP was found to change a sign from a negative to a positive one with increasing doping. It is shown that the sign reversal of the dT C /dP coefficient for La 1−x M x CoO 3 (M = Ca,Sr,Ba) cobaltites can be caused by the hole doping and also, independently, by the lattice expansion only induced by an increase of the dopant ion size. The complex pressure effect on ferromagnetic transition T C in cobaltites is well described in terms of competing e g -electron bandwidth W and crystal-field splitting energy, basing on the known pressure variations of the steric factors. For La 1−x Ba x CoO 3 with x = 0.3,0.5, having a high enough concentration of intermediate spin Co states, we observed a Jahn-Teller-like magnetic transition signified by a distinct hysteresis in field-cooled magnetization below T C . This transition was found to disappear under moderate applied pressure, evidenced for La 0.7 Ba 0.3 CoO 3 by abrupt changes in the spontaneous magnetization and coercive field at 5 K.

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“…Specifically, the best reported perovskite OER electrocatalysts suffer a minimum theoretical overpotential of 300–400 mV that originates from the scaling relationship . The lattice-oxygen mechanism (LOM), in which surface oxygen is activated as a highly active site for the OER, can subtly circumvent the redox switching of 3d transition-metal sites. ,, Furthermore, the LOM is closely related to the metal–oxygen covalency. ,, For example, LaCoO 3 is quite stable under OER conditions and follows the traditional AEM. However, the scaling relationship between *OOH and *OH can be broken for La 0.6 Sr 0.4 CoO 3 .…”

Section: Strategies To Enhance Intrinsic Activitymentioning

confidence: 99%

Emerging Strategies for Developing High-Performance Perovskite-Based Materials for Electrochemical Water Splitting

et al. 2020

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Electrochemical water splitting is one of the most promising techniques for producing high-purity hydrogen without carbon emissions. To commercialize this attractive technique, designing cost-effective, highly efficient, and stable electrocatalysts is desired. Perovskite oxides have been widely applied in many fields as efficient and low-cost catalysts due to their flexible compositions and structures, offering considerable opportunities and strategies to design desired electrocatalysts. In this Review, we present emerging strategies mainly based on our group’s works about electrochemical water splitting for developing perovskite-based electrocatalysts to enhance the intrinsic and apparent activity of water splitting. The relationship between the composition/structure and the electrochemical activity of these materials is established for the rational design of more practical water-splitting electrocatalysts.

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Short- and long-range order in La1−xSrxCoO3 and La1−xBaxCoO3

Cited by 21 publications

References 14 publications

Chemical and electronic characterization of cobalt in a lanthanum perovskite. Effects of strontium substitution

Chemical and electronic characterization of cobalt in a lanthanum perovskite. Effects of strontium substitution

Ferromagnetic state of La1−xBaxCoO
Fita
¹
,
Szymczak
²
,
Puźniak
³

et al. 2011
Phys. Rev. B
27
1
19
0
View full text Add to dashboard Cite

Emerging Strategies for Developing High-Performance Perovskite-Based Materials for Electrochemical Water Splitting

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Short- and long-range order in La1−xSrxCoO3 and La1−xBaxCoO3

Cited by 21 publications

References 14 publications

Chemical and electronic characterization of cobalt in a lanthanum perovskite. Effects of strontium substitution

Chemical and electronic characterization of cobalt in a lanthanum perovskite. Effects of strontium substitution

Ferromagnetic state of La1−xBaxCoOFita1, Szymczak2, Puźniak3 et al. 2011Phys. Rev. B271190View full textAdd to dashboardCite

Emerging Strategies for Developing High-Performance Perovskite-Based Materials for Electrochemical Water Splitting

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Ferromagnetic state of La1−xBaxCoO
Fita
¹
,
Szymczak
²
,
Puźniak
³

et al. 2011
Phys. Rev. B
27
1
19
0
View full text Add to dashboard Cite