Abstract
Perovskite-type was synthesized by two methods, the combustion method and conventional solid state reaction (SSR) method. The effect of synthesis methods on sinterability and physical properties of the ceramic were investigated. The results show that there are advantages of the combustion method in producing doped lanthanum chromites. Compared with the SSR method, the combustion method reduces the sintering temperature of La0.8Ca0.2CrO3, elevates the electronic conductivity and thermal expansion coefficient (TEC) of the ceramic, due to optimizing the microstructure. At the same densities level (–93%), the specimen synthesized by the combustion method reaches a superior electrical conductivity of 31.6 S·cm-1 and a compatible TEC of 10.7 × 10−6 K−1 at 800 °C.
Highlights
Lanthanum chromite (LaCrO3 )-based perovskite phases possess high melting points, large electronic conductivity and stability in high-temperature reducing and oxidizing atmospheres, which makes them promising candidates for heating elements of muffle furnaces and current-conducting electrodes in magneto-hydrodynamics, especially interconnectors of solid oxide fuel cell (SOFCs) [1,2,3,4,5,6].The interconnections of SOFCs have a dual function of separating reducing and oxidizing gases and providing a short-circuit current between individual cells
LaCrO3 is difficult to sinter to high densities in air, due to appreciable volatilization loss of chromium oxide at high temperatures in oxidizing atmospheres [7,8,9]
The samples were synthesized by both combustion and solid state reaction (SSR) methods
Summary
Lanthanum chromite (LaCrO3 )-based perovskite phases possess high melting points, large electronic conductivity and stability in high-temperature reducing and oxidizing atmospheres, which makes them promising candidates for heating elements of muffle furnaces and current-conducting electrodes in magneto-hydrodynamics, especially interconnectors of solid oxide fuel cell (SOFCs) [1,2,3,4,5,6]. Physical properties of the ceramics, such as electrical transport and thermal expansion, may be affected by the characteristics of the powders synthesized by the methods, possibly due to different microstructures of the sintered ceramics. We synthesized La0.8 Ca0.2 CrO3 powders by a combustion method in comparison with the high temperature solid state reaction (SSR) method, and investigated the influence of preparation methods on sinterability, electrical transport and thermal expansion of the ceramics
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