10.14489/td.2018.06.pp.040-045

2018, 06 June

DOI: 10.14489/td.2018.06.pp.040-045

Astafyev A. L., Lysenko E. N., Surzhikov A. P.
INVESTIGATION OF THE SENSITIVITY OF THE THERMOMAGNETOMETRIC METHOD FOR DETERMINING MAGNETIC PHASES IN POWDER SYSTEMS
(pp. 40-45)

Abstract. In the present work, the sensitivity of the thermomagnetometric method for determining the magnetic phase inclusions in Li0,4Fe2,4Zn0,2O4 + Fe2O3 and LiFe5O8 + Al2O3 powder mixtures at a content of 6 wt. % or less of the ferrite phase was studied. Detection of the magnetic phase was carried out by the presence of a magnetic phase transition at the Curie temperature when the samples were heated in a thermal analyzer furnace. Thermomagnetometric analysis data were compared with the results of X-ray phase analysis. It is shown that the thermomagnetometric method makes it possible to determine ferrite magnetic phases with a content of not less than 0,25 % by weight in composite powder mixtures. In this case, the content of a certain ferrite phase can be quantitatively determined by the magnitude of the jump on the thermogravimetric curve. With such a small quantitative content of magnetic phases, the result obtained with X-ray phase analysis is below the sensitivity of the device itself.

Keywords: lithium ferrite, lithiumzinc ferrite, thermogravimetry, thermomagnetometry, curie temperature, X-ray analysis.

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А. L. Astafyev, E. N. Lysenko, A. P. Surzhikov (National Research Tomsk Polytechnic University, Tomsk, Russia)

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