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Phase evolution, microstructure, and gas-sensing characteristics of the Sb2O3–Fe2O3 system prepared by coprecipitation

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Abstract

Precursor powders with antimony-to-iron (Sb/Fe) atomic ratios ranging from 0 to 2.0 were prepared by chemical coprecipitation. The origin of enhanced gas-sensing behavior at a higher calcining temperature was investigated, based on phase evolution and microstructure characterized by means of thermal analysis, x-ray diffraction, Brunauer–Emmett–Teller surface area measurement, and electron microscopy. Only one iron–antimony oxide (i.e., FeSbO4) could be obtained under present experimental conditions. Pure FeSbO4 exhibited a high gas sensitivity, only when calcining temperature was below 600 °C. A rapid crystallite growth, as well as hard agglomeration, occurred in pure FeSbO4 powder calcined at 600–1000 °C, and thus led to poor gas-sensing behavior. However, there existed an optimal Sb/Fe ratio range (i.e., 0.25 to 0.65) in which crystallite growth of both α–Fe2O3 and FeSbO4 could be efficiently depressed up to 800 °C. The samples (with Sb/Fe ratio in the range 0.25–0.65) calcined at 600–800 °C displayed a high sensitivity to liquid petroleum gas due to their large specific surface area and poor crystallinity.

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Authors and Affiliations

  1. School of Applied Science, Division of Materials Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore

    Tianshu Zhang, P. Hing & Ruifang Zhang

  2. Department of Inorganic Materials, Shanghai University, Shanghai, 201800, People's Republic of China

    Jiancheng Zhang

  3. Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, China

    Young Li

Authors
  1. Tianshu Zhang
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  2. P. Hing
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  3. Ruifang Zhang
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  4. Jiancheng Zhang
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  5. Young Li
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Zhang, T., Hing, P., Zhang, R. et al. Phase evolution, microstructure, and gas-sensing characteristics of the Sb2O3–Fe2O3 system prepared by coprecipitation. Journal of Materials Research 15, 2356–2363 (2000). https://doi.org/10.1557/JMR.2000.0339

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  • DOI: https://doi.org/10.1557/JMR.2000.0339

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