Triplet states of oxygen vacancy defects in α-quartz: Center
1 V.S. Sobolev Institute of Geology and Mineralogy SB RAS - 630090 Novosibirsk, Russia
2 Department of Geological Sciences, University of Saskatchewan - Saskatoon, Saskatchewan, Canada S7N 5E2
Received: 24 April 2014
Accepted: 11 July 2014
The paramagnetic center in triplet state occurring in electron-irradiated, synthetic α-quartz has been investigated by using electron paramagnetic resonance (EPR) spectroscopy. The primary spin Hamiltonian parameter matrices g, D and A (hyperfine interactions for five 29Si nuclei) have now been determined. The principal values and principal directions of D and A matrices allow us to suggest the structural model for this stable triplet defect. The center involves the two unpaired electrons located in the orbitals of two silicon atoms next to one oxygen vacancy each. Firm correlations between the spin Hamiltonian matrix principal axes and crystallographic directions have been attained.
PACS: 61.72.jd – Vacancies / 42.70.Ce – Glasses, quartz / 61.72.J- – Point defects and defect clusters
© EPLA, 2014