EPR of iron centres in silicon dioxide

@article{Weil1994EPROI,
  title={EPR of iron centres in silicon dioxide},
  author={John A. Weil},
  journal={Applied Magnetic Resonance},
  year={1994},
  volume={6},
  pages={1-16}
}
  • J. A. Weil
  • Published 1 February 1994
  • Physics
  • Applied Magnetic Resonance
A review is presented of the present status of EPR-based understanding of Fe in SiO2. As a primary goal, a guide to the literature is given. Quantitative evaluation of all relevant spin-Hamiltonian parameters is discussed, as is computer-based spectral simulation, for single crystals (alpha-quartz), powders and glasses (vitreous quartz). Identification of the numerous centres now known (e.g., for Fe3+:[FeO4/M]0 with M=H, Li, Na, …, as well as [FeO4]−) is featured, discussing atomic positions… 
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References

SHOWING 1-10 OF 69 REFERENCES
EPR study of Fe3+ in α‐quartz: A reexamination of the so‐called I center
10 GHz electron paramagnetic resonance studies of Fe3+ in synthetic brown α‐quartz single crystals have been carried out at 295 and at 40 K. The spin‐Hamiltonian parameters were determined including
A review of electron spin spectroscopy and its application to the study of paramagnetic defects in crystalline quartz
A comprehensive review (ca. 230 references) is presented of the present (1983) state of knowledge of paramagnetic defects in crystalline quartz, as derived from electron paramagnetic resonance
Electron magnetic resonance in lithium oxide from a centre containing Fe3
EPR has been performed on single crystals of nominally pure 7Li2O: (a) as grown, (b) after X-irradiation, and (c) after subsequent annealing: (a) shows evidence of several sites of Fe3+ in low
EPR Spectrum of Fe3+ in Synthetic Brown Quartz
A detailed description is given of the EPR spectrum of Fe3+ in synthetic brown quartz (the so‐called I center, presumed to be interstitial). There are three equally populated sites differing only in
Paramagnetic point and pair defects in oxide perovskites
2014 A review is given of electron paramagnetic resonance (EPR) research of substitutional defects in ABO3 double oxides crystallizing in the perovskite structure. In section 2, the valency and
Optical and Paramagnetic Properties of Iron Centers in Quartz
Several different paramagnetic centers have been identified and studied in specimens of natural and synthetic α quartz. The dominant feature of the EPR spectrum of natural amethyst and citrine is a
Temperature dependence and hyperfine structure of Fe3+ centres in synthetic quartz
The temperature dependence of spin Hamiltonian parameters of Fe3+ centres in synthetic quartz has been investigated with an X-band EPR spectrometer. The fine-structure parameters D and E of Fe3+
The structures of three centers of trivalent iron in α-quartz
Trivalent iron is known to occur in amethysts in three different environments: substitutional with an as yet unidentified alkali ion in an adjacent interstitial site on the twofold axis (so-called S1
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