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Structure, electrical, and thermal expansion properties of (La0.8Ca0.2)(Cr0.9–xCo0.1Nix)O3–δ interconnect materials for intermediate temperature solid oxide fuel cells

Published online by Cambridge University Press:  31 January 2011

Yen-Pei Fu  and
Hsin-Chao Wang
Yen-Pei Fu*
Affiliation:
Department of Materials Science and Engineering, National Dong-Hwa University, Shou-Feng, Hualien 974, Taiwan
Hsin-Chao Wang
Affiliation:
Department of Materials Science and Engineering, National Dong-Hwa University, Shou-Feng, Hualien 974, Taiwan
*
a) Address all correspondence to this author. e-mail: d887503@alumni.nthu.edu.tw
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Abstract

The microstructure, lattice parameters, electrical conductivity, thermal expansion, and mechanical properties of (La0.8Ca0.2)(Cr0.9–xCo0.1Nix)O3–δ (x = 0.03, 0.06, 0.09, 0.12) were systematically investigated in this work. Nickel doping of (La0.8Ca0.2)(Cr0.9Co0.1)O3–δ is an effective way of increasing the thermal expansion coefficient (TEC) and stabilizing the high-temperature phase transformation from rhombohedral to tetragonal. As the nickel-doped content increases, the TEC increases parabolically by TEC (x) (ppm/°C) = 10.575 + 63.3x−240x2 (x = 0.03−0.12). The electrical conductivity of (La0.8Ca0.2)(Cr0.9–xCo0.1Nix)O3–δ specimens increases systematically with increasing nickel substitution in the range of 0.03 ≤ x ≤ 0.09 and reaches a maximum for the composition of (La0.8Ca0.2)(Cr0.81Co0.1Ni0.09)O3–δ (σ850 °C ∼60.36 S/cm). There is a slight increase in the fracture toughness with increasing nickel doping content, and the fracture toughness is strongly affected by the grain size. It seems that there is an increase in the fracture toughness with decreasing grain size. However, the microhardness does not significantly depend on the grain size in this study. The (La0.8Ca0.2)(Cr0.81Co0.1Ni0.09)O3–δ specimen shows high electrical conductivity, a moderate thermal expansion coefficient, and nearly linear thermal expansion behavior from room temperature to 800 °C. It will be suitable for interconnect materials for intermediate temperature solid oxide fuel cells (IT-SOFCs).

Keywords

CeramicElectrical propertiesMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 5 , May 2009 , pp. 1748 - 1755
Copyright
Copyright © Materials Research Society 2009

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