Groups of Paramagnetic Centres in Reduced and Methylated Low Rank Coal

• Authors: B. Pilawa , H. Wachowska , M. Kozłowski , A. Więckowski , L. Najder-Kozdrowska
• Languages of publication: EN

Abstracts

EN

Low rank Illinois No. 6 coal was studied by electron paramagnetic resonance EPR spectroscopy. The parameters of EPR spectra (spectroscopic splitting factors g, linewidths ΔB_{pp}, concentrations of paramagnetic centres N) were measured for row and chemically treated coal (demineralized, reduced and methylated samples). The multi-component structure of experimental spectra of this coal was proved. Two groups of paramagnetic centres responsible for broad Lorentzian 1 and narrow Lorentzian 2 lines exist in studied samples. Paramagnetic centres connected with component lines revealed different behaviour during chemical treatments.

Keywords

EN

33.35.+r; 61.66.Hq; 76.30.-v; 76.30.Rn; 89.30.ag

Discipline

• 76.30.Rn: Free radicals
• 61.66.Hq: Organic compounds
• 89.30.ag: Coal
• 33.35.+r: Electron resonance and relaxation(see also 76.30.-v Electron paramagnetic resonance and relaxation in condensed matter)
• 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 3
• Pages: 264-267

Dates

published

2015-09

received

2014-01-29

(unknown)

2014-08-19

Contributors

author

B. Pilawa

• Centre of Polymer and Carbon Materials of the Polish Academy of Sciences, M. Curie-Skłodowskiej 34, 41-819 Zabrze, Poland

author

H. Wachowska

• Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland

author

M. Kozłowski

• Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland

author

A. Więckowski

• Institute of Physics, University of Zielona Góra, Z. Szafrana 4a, 65-516 Zielona Góra, Poland
• Institute of Molecular Physics of the Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

L. Najder-Kozdrowska

• Institute of Physics, University of Zielona Góra, Z. Szafrana 4a, 65-516 Zielona Góra, Poland

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Identifiers

DOI

10.12693/APhysPolA.128.264