Defect chemistry and high-temperature thermodynamics of PrBaCo2O6-δ

Sednev-Lugovets, Anton L.; Sereda, Vladimir V.; Malyshkin, Dmitry A.; Цветков, Д. С.; Ivanov, Ivan L.; Zuev, A. Yu.; Maignan, A.

doi:10.1016/j.jct.2021.106523

Cited by 4 publications

(22 citation statements)

References 31 publications

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“…8, where the measurement results at similar temperatures are presented for RBaCo 2 O 6– δ (R = Pr, Nd, Gd), β a ≈ − β c for these double perovskite cobaltites, and their chemical expansion is close, taking into account the scatter in the data. 123,148,149 However, when all available experimental data for each of these oxides are considered, 31,123,144,148,149,233–235 it is immediately seen (Fig. S1–S3 in the ESI†) that the ε chem ( δ ) values do not often coincide well except for GdBaCo 2 O 6– δ , for which the results of Mogni et al , 233 Tsvetkov et al 123 and Chatterjee et al 31 agree with each other in the overlapping δ ranges.…”

Section: Some Peculiarities and Trends In The Chemical Expansion Of O...mentioning

confidence: 87%

“…The magnetic contribution to the chemical expansion mentioned above for some double perovskites 226–232,246 is another emerging field of study which may hold answers for some still unexplained chemical strain related phenomena. This is also true for anisotropic chemical expansion of layered oxide materials, which have not yet been studied extensively in this respect, but the existing body of knowledge 10,31,123,144,148,149,226–235,254,256,257,259 indicates that controlling the degree of anisotropy may be an important route to controlling the chemical expansion of oxides.…”

Section: Discussionmentioning

confidence: 99%

“…81 One clear exception is LaBaCo 2 O 6– δ , 236–238 for which both expansion of a and contraction of c are higher than for the other RBaCo 2 O 6– δ (R = Pr, Nd, Gd). 31,123,144,148,149,233–235 Bernuy-Lopez et al 236 even claimed the expansion of LaBaCo 2 O 6– δ along the c axis, but their data are inconsistent across the plots presented in the article, and neither their nonstoichiometry values nor crystallographic data are supported by other studies. 243–245…”

Section: Some Peculiarities and Trends In The Chemical Expansion Of O...mentioning

confidence: 94%

“…This is accompanied by a significant decrease of the unit cell parameter c , which may be related to the weakening of electrostatic repulsion between ions as interstitial oxygen leaves the crystal lattice. 256 As a result, as for many double perovskites, 31,123,144,148,149,226–235 the volumetric chemical expansion of Ruddlesden–Popper oxides is almost zero or even negative: 10,254,256,257,259 for example, for La 2 NiO 4+ δ , β a = −0.028, β c = 0.076, and β = 0.002. 10,256 Substitution of small amounts of Fe, Co or Cu for Ni in La 2 NiO 4+ δ increases, by an absolute value, its chemical strain along the a axis, while β c remains almost unchanged.…”

Section: Some Peculiarities and Trends In The Chemical Expansion Of O...mentioning

confidence: 99%

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Chemical lattice strain in nonstoichiometric oxides: an overview

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Section: Some Peculiarities and Trends In The Chemical Expansion Of O...mentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Some Peculiarities and Trends In The Chemical Expansion Of O...mentioning

confidence: 94%

Section: Some Peculiarities and Trends In The Chemical Expansion Of O...mentioning

confidence: 99%

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Chemical lattice strain in nonstoichiometric oxides: an overview

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“…Although this work overviews the last trends in LODPs, a number of recent publications fell within the reviewing procedure. In our opinion, these works [ 205 , 206 , 207 , 208 , 209 , 210 , 211 ] should be mentioned with no detailed analysis.…”

Section: Discussionmentioning

confidence: 99%

Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells

et al. 2021

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Development of new functional materials with improved characteristics for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is one of the most important tasks of modern materials science. High electrocatalytic activity in oxygen reduction reactions (ORR), chemical and thermomechanical compatibility with solid electrolytes, as well as stability at elevated temperatures are the most important requirements for cathode materials utilized in SOFCs. Layered oxygen-deficient double perovskites possess the complex of the above-mentioned properties, being one of the most promising cathode materials operating at intermediate temperatures. The present review summarizes the data available in the literature concerning crystal structure, thermal, electrotransport-related, and other functional properties (including electrochemical performance in ORR) of these materials. The main emphasis is placed on the state-of-art approaches toimproving the functional characteristics of these complex oxides.

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Redox Thermochemistry, Thermodynamics, and Solar Energy Conversion and Storage Capability of Some Double Perovskite Cobaltites

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The oxygen nonstoichiometry, δ, and oxidation enthalpy, ΔH ox , of double perovskites RBaCo 2 O 6−δ (R = Sm or Eu) were simultaneously measured depending on the temperature and oxygen partial pressure, p O 2 . Theoretical equations for ΔH ox (T, δ) and p O 2 (T, δ) were derived from the defect structure model based on the oxygen exchange and cobalt disproportionation reactions. These equations were fitted independently to each of the experimental ΔH ox (T, δ) and p O 2 (T, δ) data sets. The resulting enthalpies of defect reactions were found to be almost the same irrespective of the calculation method. In other words, the models, describing satisfactorily the data, can be used to calculate both compositional dependences and redox thermodynamics of RBaCo 2 O 6−δ (R = Sm or Eu). In addition, from the previously published data and the data presented here, trends were determined in the defect reaction thermodynamics of RBaCo 2 O 6−δ (R = La, Pr, Nd, Sm, Eu, Gd, or Y). Drop calorimetric measurements were performed in air to obtain enthalpy increments for RBaCo 2 O 6−δ (R = Sm or Eu) with variable oxygen content because the samples lost oxygen upon being heated in the calorimetric cell. As-obtained data were used to calculate the functional dependences of enthalpy increments of EuBaCo 2 O 5.56 and SmBaCo 2 O 5.6 with a constant oxygen content. In addition, as an example of practical application-oriented calculations for solar energy conversion and oxygen storage, the performances at equilibrium of RBaCo 2 O 6−δ (R = Pr, Sm, Eu, or Gd) were evaluated and compared to those of SrFeO 3−δ as a reference material.

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Defect chemistry and high-temperature thermodynamics of PrBaCo2O6-δ

Cited by 4 publications

References 31 publications

Chemical lattice strain in nonstoichiometric oxides: an overview

Chemical lattice strain in nonstoichiometric oxides: an overview

Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells

Redox Thermochemistry, Thermodynamics, and Solar Energy Conversion and Storage Capability of Some Double Perovskite Cobaltites

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