THERMAL EXPANSION, ELECTRICAL CONDUCTIVITY AND OXYGEN NONSTOICHIOMETRY OF La2-xSrxNiO4-δ NICKELATES AS PROSPECTIVE SOFC CATHODE MATERIALS
Abstract
La2-xSrxNiO4-δ (x = 1.0–1.6) nickelates were evaluated as potential cathode materials for solid oxide fuel cells, with focus on the structural stability, oxygen nonstoichiometry and electrical conductivity under oxidizing conditions. All studied ceramic materials were found to preserve K2NiF4-type tetragonal structure under oxidizing conditions at 25–900 °С.
La2-xSrxNiO4-δ (x = 1.0–1.6) nickelates demonstrate oxygen deficiency at temperatures above 500 °С, with oxygen nonstoichiometry increasing with temperature and strontium content. The electrical conductivity is p-type and show metallic-like behavior under oxidizing conditions at 500–1000 °С. The highest conductivity values, 220 S/cm at 900 °С and 440 S/cm at 600 °С in air, are measured for La0,8Sr1,2NiO4-δ ceramics. While the high-temperature XRD studies revealed strongly anisotropic thermal expansion of La2-xSrxNiO4-δ crystal lattice, the lattice volume show nearly linear dependence on temperature, with average linear thermal expansion coefficients varying in the range (14.2–15.6) · 10-6 K-1.
La2-xSrxNiO4-δ (x = 1.0–1.6) nickelates demonstrate oxygen deficiency at temperatures above 500 °С, with oxygen nonstoichiometry increasing with temperature and strontium content. The electrical conductivity is p-type and show metallic-like behavior under oxidizing conditions at 500–1000 °С. The highest conductivity values, 220 S/cm at 900 °С and 440 S/cm at 600 °С in air, are measured for La0,8Sr1,2NiO4-δ ceramics. While the high-temperature XRD studies revealed strongly anisotropic thermal expansion of La2-xSrxNiO4-δ crystal lattice, the lattice volume show nearly linear dependence on temperature, with average linear thermal expansion coefficients varying in the range (14.2–15.6) · 10-6 K-1.
About the Authors
E. S. Kravchenko
Belarusian State University
Russian Federation
M. Sc. (Chemistry), student.
Russian Federation
M. Sc. (Chemistry), student.
K. V. Zakharchuk
CICECO – Aveiro Institute of Materials
Russian Federation
Research Fellow.
Russian Federation
Research Fellow.
A. A. Yaremchenko
CICECO – Aveiro Institute of Materials
Russian Federation
Ph. D. (Chemistry), Principal Researcher
Russian Federation
Ph. D. (Chemistry), Principal Researcher
J. Grins
Stockholm University
Russian Federation
Ph. D. (Chemistry), Researcher.
Russian Federation
Ph. D. (Chemistry), Researcher.
G. Stockholm University,
Stockholm University
Russian Federation
D. Sc. (Chemistry), Professor, Head of the Department.
Russian Federation
D. Sc. (Chemistry), Professor, Head of the Department.
V. V. Pankov
Belarusian State University
Russian Federation
D. Sc. (Chemistry), Professor, Head of Departament "Physical Chemistry"
Russian Federation
D. Sc. (Chemistry), Professor, Head of Departament "Physical Chemistry"
E. V. Petrova
Belarusian State University
Russian Federation
M. Sc. (Chemistry), student.
Russian Federation
M. Sc. (Chemistry), student.
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