Chemical stability of doped BaCeO3-BaZrO3 solid solutions in different atmospheres
来源期刊:JOURNAL OF RARE EARTHS2008年第4期
论文作者:WANG Ling L GUO Hongxia LI Yuehua DAI Lei FAN Lihua
Key words:BaCeO3; BaZrO3; proton conductor; chemical stability; different atmospheres; rare earths;
Abstract: BaCe0.45Zr0.45M0.1O3-δ (M=Y, In) and BaCe0.9Y0.1O3-δ were prepared through the conventional solid state reaction route. The chemical stability was investigated in hydrogen, carbon dioxide, and boiling water. Crystalline phase and microstructure of the proton conductor before and after stability test were measured with X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results showed that all materials were quite stable in H2 atmosphere. In CO2 atmosphere, BaCe0.45Zr0.45M0.1O3-δ (M=Y, In) were relatively stable, while BaCe0.9Y0.1O3-δ decomposed. In boiling water, BaCe0.9Y0.1O3-δ was quickly decomposed into Ba(OH)2 and corresponding oxide. BaCe0.45Zr0.45M0.1O3-δ slightly reacted with boiling water and some amorphous phases were formed. However, BaCe0.45Zr0.45In0.1O3-δ was observed to exhibit better stability than BaCe0.45Zr0.45Y0.1O3-δ in water. The experimental results were interpreted in terms of thermodynamic data and tolerance factor.
WANG Ling1,L2,GUO Hongxia1,LI Yuehua1,DAI Lei1,FAN Lihua1
(1.College of Chemical Engineering and Biotechnology, Hebei Polytechnic University, Tangshan 063009, China;
2.U) Jingde(College of Chemical Engineering and Biotechnology, Hebei Polytechnic University, Tangshan 063009, China)
Abstract:BaCe0.45Zr0.45M0.1O3-δ (M=Y, In) and BaCe0.9Y0.1O3-δ were prepared through the conventional solid state reaction route. The chemical stability was investigated in hydrogen, carbon dioxide, and boiling water. Crystalline phase and microstructure of the proton conductor before and after stability test were measured with X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results showed that all materials were quite stable in H2 atmosphere. In CO2 atmosphere, BaCe0.45Zr0.45M0.1O3-δ (M=Y, In) were relatively stable, while BaCe0.9Y0.1O3-δ decomposed. In boiling water, BaCe0.9Y0.1O3-δ was quickly decomposed into Ba(OH)2 and corresponding oxide. BaCe0.45Zr0.45M0.1O3-δ slightly reacted with boiling water and some amorphous phases were formed. However, BaCe0.45Zr0.45In0.1O3-δ was observed to exhibit better stability than BaCe0.45Zr0.45Y0.1O3-δ in water. The experimental results were interpreted in terms of thermodynamic data and tolerance factor.
Key words:BaCeO3; BaZrO3; proton conductor; chemical stability; different atmospheres; rare earths;
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