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Paramagnetic Centres in Oxidised Coal

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Najder-Kozdrowska L., Samoilova R., Kappl R., Hüttermann J., Więckowski A.
Acta Physica Polonica A
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2010
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vol. 118
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issue 3
475-479
EN
This paper comprises the results obtained by continuous wave (cw)/pulse electron paramagnetic resonance spectroscopy for oxidised coals. The values of EPR linewidths are different for samples of coal treated by different chemical agents. The asymmetric EPR line shape indicates to complex composition of paramagnetic centres in coal. In coal oxidised by HNO_3 big changes of linewidth with temperature were observed. For all samples the spin-lattice relaxation time T_1 was determined by pulse EPR method. The correlation between used chemical agents and the value of T_1 was established.
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