Proof of the thermodynamical stability of the E' center in SiO2

Details Proof of the thermodynamical stability of the E' center in SiO2 Proof of the thermodynamical stability of the E' center in SiO2

2000-09-29

arxiv.org/abs/cond-mat/0009465v1

Physics

Condensed Matter

Materials Science

RevTeX 4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.86.3064

The E' center is a paradigmatic radiation-induced defect in SiO2 whose peculiar EPR and hyperfine activity has been known since 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 strongly 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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