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Effect of metal substitution for cobalt on the oxygen adsorption properties of YBaCo4O7

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Abstract

YBaCo4O7 compound is capable to intake and release a large amount of oxygen in the temperature range of 200–400°C. In the present study, the effect of Zn, Ga and Fe substitution for Co on the oxygen adsorption/desorption properties of YBaCo4O7 were investigated by thermogravimetry (TG) method. Due to fixed oxidation state of Zn2+ ions, the substitution of Zn2+ for Co2+ suppresses the oxygen adsorption of YBaCo4−xZnxO7. The substitution of Ga3+ for Co3+ also decreases the oxygen absorption capacity of YBaCo4−xGaxO7. This can be explained by the strong affinity of Ga3+ ions towards the GaO4 tetrahedron. Compared with Zn- and Ga-substituted samples, the drop of oxygen adsorption capacity is smallest for Fe-substituted samples because of the similar changeability of oxidation states of Co and Fe ions.

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Authors and Affiliations

  1. Key Laboratory of Material Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou, 450052, China

    H. Hao & X. Hu

  2. Department of Mathematical and Physical Sciences, Henan Institute of Engineering, Zhengzhou, 451191, China

    H. Hao & L. Zhao

  3. Department of Chemistry, Zhengzhou University, Zhengzhou, 450052, China

    H. Hao & H. Hou

Authors
  1. H. Hao
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  2. L. Zhao
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  3. X. Hu
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  4. H. Hou
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Correspondence to X. Hu.

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Hao, H., Zhao, L., Hu, X. et al. Effect of metal substitution for cobalt on the oxygen adsorption properties of YBaCo4O7 . J Therm Anal Calorim 95, 585–588 (2009). https://doi.org/10.1007/s10973-008-9234-5

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  • DOI: https://doi.org/10.1007/s10973-008-9234-5

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