6533b7d1fe1ef96bd125d823

RESEARCH PRODUCT

Structural relaxation of E_gamma centers in amorphous silica

S. AgnelloR. BoscainoG. BuscarinoM. CannasF. M. Gelardi

subject

Condensed Matter - Materials ScienceAstrophysics::High Energy Astrophysical PhenomenaMaterials Science (cond-mat.mtrl-sci)FOS: Physical scienceselectron paramagnetic resonance E' centers amorphous silicon dioxide sio2

description

We report experimental evidence of the existence of two variants of the E' gamma centers induced in silica by gamma rays at room temperature. The two variants are distinguishable by the fine features of their line shapes in paramagnetic resonance spectra. These features suggest that the two E' gamma differ for their topology. We find a thermally induced interconversion between the centers with an activation energy of about 34 meV. Hints are also found for the existence of a structural configuration of minimum energy and of a metastable state.

yearjournalcountryeditionlanguage
2002-03-13
10.1103/physrevb.66.113201http://hdl.handle.net/10447/98004