- Tytuł:
- Determination of the fraction of paramagnetic centers not-fulfilling the Curie law in coal macerals by the two-temperature EPR measurement method
- Autorzy:
-
Słowik, G. P.
Więckowski, A. B. - Powiązania:
- https://bibliotekanauki.pl/articles/146892.pdf
- Data publikacji:
- 2015
- Wydawca:
- Instytut Chemii i Techniki Jądrowej
- Tematy:
-
electron paramagnetic resonance (EPR)
macerals
two-temperature EPR measurement - Opis:
- Two-temperature electron paramagnetic resonance (EPR) measurements, applied to determine the relative contributions of paramagnetic centers – fulfilling and not-fulfilling the Curie law, were carried out. The measurements were made on the macerals – exinite and vitrinite, separated from clarain of the Polish medium- -rank coal (85.6 wt% C). The two-temperature EPR measurements, presented in this work, were performed respectively, at temperatures: T1 = 293 K and T2 = 173 K for exinite, and T1 = 293 K and T2 = 153 K for vitrinite. The relative contributions X of spins not-fulfilling the Curie law present in the studied macerals were calculated. A comparison of different methods of calculating the relative contributions of paramagnetic centers – fulfilling and not-fulfilling the Curie law, present in exinite and vitrinite studied by EPR was made.
- Źródło:
-
Nukleonika; 2015, 60, No. 3, part 1; 389-393
0029-5922
1508-5791 - Pojawia się w:
- Nukleonika
- Dostawca treści:
- Biblioteka Nauki
Artykuł