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Thermodynamic, thermogravimetric and permittivity studies of hausmannite (Mn3O4) in air

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Abstract

Some manganese oxides are considered hyperactive under microwave irradiation because of their extremely high heating rates in air. In order to further understand this hyperactivity, thermodynamic calculations, thermogravimetric analysis and both real and imaginary permittivity determinations were performed for hausmannite (Mn3O4) as a function of temperature in an air atmosphere. The thermodynamic results demonstrated reasonable agreement with the thermogravimetric analysis data. A comparison of the derivative thermogravimetric analysis data with the derivative of both the real and the imaginary permittivities confirmed that the extremely high values of the permittivities were due to the conversion of the hausmannite to bixbyite (Mn2O3). The microwave hyperactivity of the manganese oxides in air is explained in terms of the high permittivities of bixbyite.

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Acknowledgements

The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for supporting this research. Also the authors would like to thank R. M. Hutcheon and J. Mouris of Microwave Properties North for the permittivity measurements and F. Gibbs of the Brockhauser Materials Institute at McMaster University for performing the TG analysis.

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Authors and Affiliations

  1. Department of Mineral Engineering, University of Mines and Technology, PO Box 237, Tarkwa, Ghana

    R. K. Amankwah

  2. Department of Mining Engineering, Queen’s University, Kingston, ON, K7L 3N6, Canada

    C. A. Pickles

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  1. R. K. Amankwah
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  2. C. A. Pickles
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Correspondence to C. A. Pickles.

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Amankwah, R.K., Pickles, C.A. Thermodynamic, thermogravimetric and permittivity studies of hausmannite (Mn3O4) in air. J Therm Anal Calorim 98, 849–853 (2009). https://doi.org/10.1007/s10973-009-0273-3

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  • DOI: https://doi.org/10.1007/s10973-009-0273-3

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