The E' center is a paradigmatic radiation-induced defect in SiO2 whose peculiar EPR and hyperfine activity has been known for over 40 years. This center has been traditionally identified with a distorted, positively charged oxygen vacancy V-O(+). However, no direct proof of the stability of this defect has ever been provided, so that its identification is still largely incomplete. Here we prove directly that distorted V-O(+) is metastable and that it satisfies the key requirements for its identification as E ', such as thermal and optical response, and activation-deactivation mechanisms.
Proof of the thermodynamical stability of the E' center in SiO2
CARBONARO, CARLO MARIA;FIORENTINI, VINCENZO;BERNARDINI, FABIO
2001-01-01
Abstract
The E' center is a paradigmatic radiation-induced defect in SiO2 whose peculiar EPR and hyperfine activity has been known for over 40 years. This center has been traditionally identified with a distorted, positively charged oxygen vacancy V-O(+). However, no direct proof of the stability of this defect has ever been provided, so that its identification is still largely incomplete. Here we prove directly that distorted V-O(+) is metastable and that it satisfies the key requirements for its identification as E ', such as thermal and optical response, and activation-deactivation mechanisms.
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