Subsolidus phase relations and crystal structures in the Pr1+xBa2−xCu3O7±δ system at 950 °C

Song, G. B.; Liang, J. K.; Liu, F. S.; Li, Yang; Luo, Jianlin; Rao, Guanghui

doi:10.1154/1.1814981

Cited by 1 publication

(3 citation statements)

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“…The introduction of Sr induces a slight shift of the peaks towards higher angles, which suggests a reduction of the cell parameters (COD ID 1533656 [38]). Small impurity peaks were found for both samples at 29.2 and 29.9°2θ, characteristic of BaCuO 2 (COD ID 1525807 [44]), as widely reported in the literature for the P compound [12,13,16,18,44]. On the contrary, the presence of this impurity phase in PS sample does not agree with Song et al solid solution investigation [38].…”

Section: Methodscontrasting

confidence: 47%

“…Quenched samples annealed in oxygen showed a phase transition from tetragonal to orthorhombic [18], while samples annealed in inert atmosphere were reported to crystallize in a tetragonal phase together with reduced oxygen content [12]. The orthorhombic-tetragonal phase transition was also observed in the Pr-rich series of materials Pr 1+x Ba 2−x Cu 3 O 6+δ starting from x = 0.30 [13] or 0.20 [15,19]. Kravchenko et al [15] found out that the orthorhombic-tetragonal phase transition occurred at about 750°C for the stoichiometric PrBa 2 Cu 3 O 6+δ .…”

Section: Introductionmentioning

confidence: 91%

“…It is now well known that the production in air of the nominal stoichiometry 1:2:3 leads to the presence of an impurity phase of BaCuO 2 , while the solid solution starts from the Pr-rich compounds Pr 1+x Ba 2-x Cu 3 O 6+δ with x = 0.08 [13].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical characterization of PrBa2−xSrxCu3O6+δ layered oxides as innovative and efficient oxygen electrode for IT-SOFCs

et al. 2020

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PrBa 2 Cu 3 O 6+δ (P) and PrBa 1.5 Sr 0.5 Cu 3 O 6+δ (PS) layered perovskite-type oxides are synthesized and characterized as oxygen electrodes in IT-SOFCs. The layered structure of P and PS compounds is constituted by the regular alternation along the crystallographic c axis of Pr O planes, Cu 2+ chains (CN = 4) and Cu 3+ pyramidal (CN = 5) layers. Interesting features of the PrBa 2 Cu 3 O 6+δ structure are the absence of cobalt, the presence of aliovalent cations and large amounts of oxygen vacancies. The substitution of 25% Ba with Sr is evaluated in order to improve the electronic conductivity of the undoped material. The compounds are synthesized via Citrate-Nitrate procedure and characterized by XRPD, 4-probe conductivity tests (100-800°C) and EIS measurements on symmetric cells in air varying the temperature (450-850°C). SEM images of post mortem cells are collected to evaluate the adhesion between components, layers thickness and particle morphology. Sr doping does not significantly improve the electrical conductivity but prompts a considerable hysteresis in the P sample between the cooling and the heating ramps. Conductivity values are lower than 100 S cm − 1 , but no electrical limitations are observed in EIS results. The introduction of a thin PrDC interlayer greatly reduces the Area Specific Resistances for both the compounds and the 0.15 Ω cm 2 target is almost fulfilled at 600°C (0.17 Ω cm 2 for PS + PrDC sample).

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