Crystal Structure and Properties of Gd1-xSrxCo1-yFeyO3-δ Oxides as Promising Materials for Catalytic and SOFC Application

被引：6

作者：

Aksenova, Tatiana, V ^{[1
]}

Mysik, Darya K. ^{[1
]}

Cherepanov, Vladimir A. ^{[1
]}

机构：

[1] Ural Fed Univ, Inst Nat Sci & Math, Ekaterinburg 620000, Russia

来源：

CATALYSTS | 2022年 / 12卷 / 11期

关键词：

solid solution; X-ray diffraction; crystal structure; thermogravimetric analysis; oxygen nonstoichiometry; conductivity; COMPLEX COBALT OXIDES; PHASE-EQUILIBRIA; LN(1-X)SR(X)COO(3-DELTA) LN; THERMOELECTRIC PROPERTIES; MAGNETIC-PROPERTIES; CATHODE MATERIALS; OXYGEN-CONTENT; PEROVSKITE; METHANE; STABILITY;

D O I：

10.3390/catal12111344

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of samples with the overall composition Gd1-xSrxCo1-yFeyO3-delta (x = 0.8; 0.9 and 0.1 <= y <= 0.9), which are promising materials for catalytic and SOFC application, was prepared by a glycerol nitrate technique. X-ray diffraction analysis allowed to describe Gd0.2Sr0.8Co1-yFeyO3-delta with 0.1 <= y <= 0.5 in a tetragonal 2a(p) x 2a(p) x 4a(p) superstructure (SG I4/mmm), while oxides with 0.6 <= y <= 0.9 exhibit cubic disordered perovskite structure (SG Pm-3m). All Gd0.1Sr0.9Fe1-yCoyO3-delta oxides within the composition range 0.1 <= y <= 0.9 possess the cubic perovskite structure (SG Pm-3m). The structural parameters were refined using the Rietveld full-profile method. The changes of oxygen content in Gd1-xSrxCo1-yFeyO3-delta versus temperature were determined by thermogravimetric analysis. The introduction of iron into the cobalt sublattice leads to a gradual increase in the unit cell parameters and unit cell volume, accompanied with increasing oxygen content. The temperature dependency of conductivity for Gd0.2Sr0.8Co0.3Fe0.7O3-delta exhibits a maximum (284 S/cm) at approximate to 600 K in air. The positive value of the Seebeck coefficient indicates predominant p-type conductivity in the Gd0.2Sr0.8Co0.3Fe0.7O3-delta complex oxide.

引用

页数：13

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