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Electronic conduction in basalt glass and glass-ceramics - correlation with magnetite crystallization

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Abstract

The d.c. conductivity measurements have been made in a wide range of temperature on a basalt glass heat-treated at different temperatures to form magnetite particles. Small polaron hopping mechanism is operative in the as-annealed glass between Fe2+ and Fe3+ ions in the isolated state. This mechanism is operative in the heat-treated samples between these ions in the magnetite grains. The d.c. conductivity at 473 K and the activation energy show significant changes around 700° C, when magnetite forms in the basalt glass, which has been correlated with the magnetic data on these samples. TSPC and TSDC data are interesting, but the data analysis is complicated by the possible occurrence of Verwey transition in the small particles of magnetite. Preliminary a.c. conductivity data support the small polaron hopping mechanism.

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Author notes

  1. J. R. Jurado-Egea

    Present address: Instito de Ceramica y Vidrio, Carretera, Madrid-Valencia, Km. 24.300, Arganda del Rey, Madrid, Spain

  2. A. K. Bandyopadhyay

    Present address: College of Ceramic Technology, 73, A.C. Banerjee Lane, 700010, Calcutta, India

Authors and Affiliations

  1. Department of Electrical Engineering, University of Edinburgh, King's Building, Edinburgh, EH9 3JL, UK

    J. R. Jurado-Egea & A. E. Owen

  2. Laboratoire des Verres du C.N.R.S. et Laboratoire de Science des Matériaux, Université de Montpellier II, 34060, Montpelier-Cedex, France

    A. K. Bandyopadhyay

Authors
  1. J. R. Jurado-Egea
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  2. A. E. Owen
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  3. A. K. Bandyopadhyay
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Jurado-Egea, J.R., Owen, A.E. & Bandyopadhyay, A.K. Electronic conduction in basalt glass and glass-ceramics - correlation with magnetite crystallization. J Mater Sci 22, 3602–3606 (1987). https://doi.org/10.1007/BF01161466

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