Journal ArticleDOI
ESR study of radiation induced paramagnetic defect centers localized on a phosphorus in binary phosphate glasses
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In this article, the P4+ center having fourfold coordination was observed in the as-irradiated (77 K) glasses, which indicated that P3+ occurs to a significant extent in the glass.Abstract:
Gamma-induced paramagnetic defects centered on phosphorus ions were investigated by ESR for binary phosphate glasses. The P4+ center having fourfold coordination was observed in the as-irradiated (77 K) glasses. On thermal annealing, this center was found to be converted into P4+ with threefold coordination, which is an analog of Si E′-center. In the glasses melted under strongly reducing conditions, the P(II)O22− center having nearly C2v symmetry was detected, this fact indicating that P3+ which is the precursor of P2+ occurs to a significant extent in the glass. The results obtained were compared with those for As which has an electronic configuration analogous to that of P.read more
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Irradiation induced defects in glasses resulting in the photoionization of polyvalent dopants
Doris Möncke,Doris Ehrt +1 more
TL;DR: In this article, the extent of solarization is strongly influenced by many factors such as glass matrix, dopants, or irradiation source, which can be detected with optical and EPR spectroscopy.
Journal ArticleDOI
X-ray induced effects in phosphate glasses
TL;DR: Optical absorption and paramagnetic resonance spectra of X-ray irradiated (λCuKα=0.154 nm) ultra-and metaphosphate glasses of high purity were studied in this article.
Journal ArticleDOI
The influence of glass composition on the properties of silver-doped radiophotoluminescent phosphate glasses
TL;DR: In this article, the influence of glass composition on the sensitivity to ionizing radiation as well as on the radiophotoluminescence build-up kinetics is studied in silver doped glass system XNaPO3, (100 - X)Ca(PO3)2, where X varied from 0 to 100 mol%. Concentration of Ag2O was 0.1 wt%.
Journal ArticleDOI
Electron spin resonance spectra of Eu2+ and Tb4+ ions in glasses
TL;DR: In this paper, electron spin resonance (ESR) spectra of Eu2+ and Tb4+ ions were observed at room temperature in one fluoride phosphate and two phosphate glasses.
References
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Journal ArticleDOI
Fundamental defect centers in glass: Electron spin resonance and optical absorption studies of irradiated phosphorus‐doped silica glass and optical fibers
TL;DR: In this article, the phosphorusoxygen-hole center (POHC) was shown to occur in two variants comprising holes trapped on one or two nonbridging oxygens, and a singlet resonance S due to E′ type defects was observed to grow in with annealing above ∼800 K, regardless of whether or not the sample was irradiated.
Journal ArticleDOI
Electron Spin Resonance Spectra of Gamma‐Ray‐Irradiated Phosphate Glasses and Compounds: Oxygen Vacancies
R. A. Weeks,P. J. Bray +1 more
TL;DR: In this paper, the doublets were attributed to an electron trapped at a nonbridging oxygen vacancy and the interaction of the electron with the nearest neighbor 31P nucleus (100% natural abundance, I = 12) produces the doublet structure.
Journal ArticleDOI
Hyperfine Interactions in X‐Irradiated Magnesium Phosphite Hexahydrate
Melvin W. Hanna,Larry J. Altman +1 more
TL;DR: In this article, an analysis of the electron spin resonance spectra of X-irradiated single crystals of MgHPO3·6H2O has shown that the principal long-lived paramagnetic species produced by irradiation is a PO3 fragment.
Journal ArticleDOI
Unstable intermediates. Part CXLIX. An electron spin resonance study of various phosphinyl radicals formed by solid-state radiolysis
TL;DR: In this article, the conditions under which these radicals are formed, and the mechanisms involved, are outlined and discussed, as well as the conditions in which they are formed and discussed.