Thermal expansion behavior and high-temperature electrical conductivity of A2−A ′Cu1−Co O4± (A = La, Pr; A′ = Pr, Sr) oxides with the K2NiF4-type structure

Мазо, Г. Н.; Kazakov, Sergey M.; Kolchina, L. M.; Morozov, A. I.; Istomin, S.Ya.; Лысков, Н. В.; Gippius, A. A.; Antipov, Evgeny V.

doi:10.1016/j.jallcom.2015.03.081

Cited by 18 publications

(13 citation statements)

References 26 publications

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“…In the search for these relationships, the great flexibility of perovskite-type oxides AMO 3 On the other hand, the discovery of high oxide ion conductivity in A n+1 M n O 3n+1 oxides has increased the search of new members of the Ruddlesden-Popper homologous series as electrodes for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs) [11][12][13][14][15][16] . In the search for these relationships, the great flexibility of perovskite-type oxides AMO 3 On the other hand, the discovery of high oxide ion conductivity in A n+1 M n O 3n+1 oxides has increased the search of new members of the Ruddlesden-Popper homologous series as electrodes for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs) [11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Exploring the physical properties of Eu₂SrCo_1.5Mn_0.5O₇, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)_n+1(Co,Mn)_nO_3n+1

et al. 2015

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A new oxide of the Ruddlesden-Popper series has been isolated and structurally characterized in the Eu-Sr-Co-Mn-O system. X-ray diffraction and electron microscopy show that polycrystalline Eu 2 SrCo 1.5 Mn 0.5 O 7 constitutes the n=2 member of a homologous series, the essential feature of which is the existence of two connected Co/Mn octahedral layers, separated by Eu atoms. Electrochemical study shows that, the area-specific resistance of this compound is 0.15Ω cm 2 at 700 ºC in air, a performance which is comparable to that of the best state-of-the-art materials used as cathode in intermediate temperature solid oxide fuel cells. Below 150 K the title material presents two different magnetic phenomena. The first one corresponds to the formation of ferromagnetic nanoclusters (T C ∼121 K) within an ordered Co 2+ /Mn 4+ atomic configuration, whereas at lower temperature (∼21 K) a spin glass state occurs. Figure 3. (a) HAADF image of along Eu 2 SrCo 1.5 Mn 0.5 O 7 [0 1 0]. A schematic model for cationic position has been inserted. (b) Corresponding ABF image where cationic atoms are in red and oxygen are in blue. Interstitial oxygen ions are indicated by blue arrows. a along [110] pseudocubic axis in a given two-layer perovskite block and along [-110] direction in adjacent blocks. Physical Properties Magnetic behaviour.The magnetic behaviour of oxides is related to metal oxidation states, charge localization and ordering phenomena, which are also related with transport properties. Thus, magnetic measurements may help to understand the electrical properties of a given material.

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Section: Introductionmentioning

confidence: 99%

Exploring the physical properties of Eu₂SrCo_1.5Mn_0.5O₇, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)_n+1(Co,Mn)_nO_3n+1

et al. 2015

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“…This situation is very similar to previous reports for La 2Àx 2. 25 It was proposed that a temperature-induced transition between low-and high-spin states of Co 3+ is responsible for such behaviour.…”

Section: Resultsmentioning

confidence: 99%

“…10,27,28 The treatment of the x ¼ 0. 25 Table 5. B-cation (and a-parameter) with increasing nickel content.…”

Section: Resultsmentioning

confidence: 99%

Tuning the high-temperature properties of Pr₂NiO_4+δby simultaneous Pr- and Ni-cation replacement

et al. 2016

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Novel Pr 2Àx Sr x Ni 1Àx Co x O 4AEd (x ¼ 0.25; 0.5; 0.75) oxides with the tetragonal K 2 NiF 4-type structure have been prepared. Room-temperature neutron powder diffraction (NPD) study of x ¼ 0.25 and 0.75 phases together with iodometric titration results have shown the formation of hyperstoichiometric oxide for x ¼ 0.25 (d ¼ 0.09(2)) and a stoichiometric one for x ¼ 0.75. High-temperature X-ray powder diffraction (HT XRPD) showed substantial anisotropy of the thermal expansion coefficient (TEC) along the a-and c-axis of the crystal structure, which increases with increasing the Co content from TEC(c)/TEC(a) ¼ 2.4 (x ¼ 0.25) to 4.3 (x ¼ 0.75). High-temperature NPD (HT NPD) study of the x ¼ 0.75 sample reveals that a very high expansion of the axial (Ni/Co)-O bonds (75.7 ppm K À1 in comparison with 9.1 ppm K À1 for equatorial ones) is responsible for such behaviour, and is caused by a temperature-induced transition between low-and high-spin states of Co 3+. This scenario has been confirmed by high-temperature magnetization measurements on a series of Pr 2Àx Sr x Ni 1Àx Co x O 4AEd samples. For compositions with high Ni content (x ¼ 0.25 and 0.5) we synthesised K 2 NiF 4-type oxides Pr 2ÀxÀy Sr x+y (Ni 1Àx Co x)O 4AEd , y ¼ 0.0-0.75 (x ¼ 0.25); y ¼ 0.0-0.5 (x ¼ 0.5). The studies of the TEC, high-temperature electrical conductivity in air, chemical stability of the prepared compounds in oxygen and toward interaction with Ce 2Àx Gd x O 2Àx/2 (GDC) at high temperatures reveal optimal behaviour of Pr 1.35 Sr 0.65 Ni 0.75 Co 0.25 O 4+d. This compound shows stability in oxygen at 900 C and does not react with GDC at least up to 1200 C. It features low TEC of 13 ppm K À1 and high-temperature electrical conductivity in air of 280 S cm À1 at 900 C, thus representing a promising composition for use as a cathode material in intermediate temperature solid oxide fuel cells (IT-SOFC).

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“…cm 2 at 700 o C [25]. It was reported that ABO3 perovskite with Cu 2+ at B site always exhibited low TECs [26,27], whereas Pr based perovskite oxides are known to exhibit high electrochemical activity, due to the redox cycles of Pr 3+ cations in the lattice [28][29][30]. In this study, Cu 2+ doped PrSrCo1-xCuxO4+ are synthesized and the effects of Cu 2+ substitution on the crystal structure, high-temperature electrical conductivity, thermal expansion behavior and the electrochemical properties of the compounds are investigated.…”

Section: Introductionmentioning

confidence: 99%

Tuning the high temperature properties of PrSrCoO4 cathode with Cu2+ dopant for intermediate temperature solid oxide fuel cells

Liu

Sun

et al. 2020

Renewable Energy

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PrSrCo1-xCuxO4+ (x = 0.0, 0.1, 0.3, 0.5) are synthesized by solid-state reaction method. The effects of Cu 2+ doping on electrical conductivity, thermal expansion, oxygen diffusion properties and oxygen reduction reaction (ORR) activity are investigated. PrSrCo1-xCuxO4+ oxides crystallize in a single-phase tetragonal structure with I4/mmm space group. Partial substitution Co 3+ by Cu 2+ results the increase of electrical conductivity and decrease of thermal expansion coefficient. Introducing Cu 2+ promotes the formation of interstitial oxygen, accelerates the kinetics of oxygen transport, and significantly improves the electrocatalytic activity of

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Thermal expansion behavior and high-temperature electrical conductivity of A2−A ′Cu1−Co O4± (A = La, Pr; A′ = Pr, Sr) oxides with the K2NiF4-type structure

Cited by 18 publications

References 26 publications

Exploring the physical properties of Eu₂SrCo_1.5Mn_0.5O₇, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)_n+1(Co,Mn)_nO_3n+1

Exploring the physical properties of Eu₂SrCo_1.5Mn_0.5O₇, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)_n+1(Co,Mn)_nO_3n+1

Tuning the high-temperature properties of Pr₂NiO_4+δby simultaneous Pr- and Ni-cation replacement

Tuning the high temperature properties of PrSrCoO4 cathode with Cu2+ dopant for intermediate temperature solid oxide fuel cells

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Thermal expansion behavior and high-temperature electrical conductivity of A2−A ′Cu1−Co O4± (A = La, Pr; A′ = Pr, Sr) oxides with the K2NiF4-type structure

Cited by 18 publications

References 26 publications

Exploring the physical properties of Eu2SrCo1.5Mn0.5O7, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)n+1(Co,Mn)nO3n+1

Exploring the physical properties of Eu2SrCo1.5Mn0.5O7, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)n+1(Co,Mn)nO3n+1

Tuning the high-temperature properties of Pr2NiO4+δby simultaneous Pr- and Ni-cation replacement

Tuning the high temperature properties of PrSrCoO4 cathode with Cu2+ dopant for intermediate temperature solid oxide fuel cells

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Exploring the physical properties of Eu₂SrCo_1.5Mn_0.5O₇, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)_n+1(Co,Mn)_nO_3n+1

Exploring the physical properties of Eu₂SrCo_1.5Mn_0.5O₇, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)_n+1(Co,Mn)_nO_3n+1

Tuning the high-temperature properties of Pr₂NiO_4+δby simultaneous Pr- and Ni-cation replacement