Electron paramagnetic resonance of rhyolite and gamma-irradiated trona minerals
Küçük Resim Yok
Tarih
2003
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
VERLAG Z NATURFORSCH
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Rhyolite from the "Yellow Stone of Nevsehir" and gamma-irradiated trona from the Ankara Mine have been investigated by electron paramagnetic resonance at ambient temperature and at 113 K. Rhyolite was examined by X-ray powder diffraction and found to consist mainly of SiO2. Before gamma-irradiation, the existing paramagnetic species in rhyolite were identified as PO42-, CH2OH, CO3-, SO2-, CO33-, and CO2- free radicals and Fe3+ at ambient temperature. At 113 K SO2-, CO33- and CO2- radicals and Fe3+ were observed. The gamma-irradiation produced neither new species nor detectable effects on these free radicals. The disappearance of some of the radicals at 113 K is attributed to the freezing of their motions. Before gamma-irradiation, the trona mineral shows only Mn2+ lines, but after gamma-irradiation it indicated the inducement of CO33- and CO2- radicals at ambient temperature, 113 K, in addition to the Mn2+ lines. The g and a values of the species were determined.
Açıklama
Anahtar Kelimeler
electron paramagnetic resonance, free radicals, silicate rhyolite, trona, gamma-irradiation
Kaynak
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
WoS Q Değeri
Q3
Scopus Q Değeri
Cilt
58
Sayı
45448
