Paramagnetic Centres in Irradiated Ultraphosphate Glasses Containing Rare Earth Elements

Autor:	T. K. Yurik, G. D. Dudko, L. I. Barsova, R. S. Chevelevich
Rok vydání:	1990
Předmět:	Hydrogen Organic Chemistry chemistry.chemical_element Biochemistry Spectral line Ion law.invention Inorganic Chemistry Crystallography Paramagnetism chemistry law Oxidizing agent Cluster (physics) Irradiation Electron paramagnetic resonance Nuclear chemistry
Zdroj:	Phosphorus, Sulfur, and Silicon and the Related Elements. 51:479-479
ISSN:	1563-5325 1042-6507
DOI:	10.1080/10426509008041003
Popis:	In this study three-component ultraphosphate glasses based on Nd, Gd, Ce penta-phosphates were investigated by the EPR method depending on their synthesis conditions. EPR spectra were recorded using a “Radiopan” (Poland) radiospectrometer with a-c-field frequency 9 GHz and modulation frequency 100 kXz at 77 K. The samples were irradiated at γ-60Co source. EPR spectra of unirradiated ultraphosphate glasses synthesized in oxidizing conditions exhibit at broad nonstructural line with ΔH1/2 = 100 mT which, probably, can be considered as a Gd3+ ion cluster. After gamma-irradiation no additive PMC (except nydrogen atoms) arise in these glasses. EPR spectra of nonirradiated glasses synthesized in reductive conditions do not exhibit paramagnetic centres. 4 types of PMC appear in EPR spectra after irradiation: hydrogen atoms doublet with A iso = 50 mT, anisotropic doublet with AI = 3.7 mT, AII = 4.6 mT and gII = 2.004, gI = 2.018 which was earlier considered as a phosphor-acid radical PO2- 4, and two doub...
Databáze:	OpenAIRE
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