Radiation-induced intrinsic defects in TeO2

Autor:	O.R. Gilliam, A Watterich, L.A. Kappers, R Voszka, J.-M. Spaeth, J R Niklas, Gábor Corradi, I. Földvári
Rok vydání:	1990
Předmět:	Analytical chemistry chemistry.chemical_element Charge (physics) Electron Condensed Matter Physics Molecular physics Oxygen chemistry General Materials Science Irradiation Tellurium Spectroscopy Spin (physics) Anisotropy
Zdroj:	Journal of Physics: Condensed Matter. 2:4325-4339
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/2/19/002
Popis:	In undoped paratellurite ( alpha -TeO2) electron-irradiated near room temperature, in addition to the VO. centre, two further intrinsic, strongly anisotropic radiation defects have been characterised using ESR and ENDOR spectroscopy. The first new centre is assumed to be an aggregate of two oxygen vacancies with a net positive charge and denoted as (VO)2.. According to this model the unpaired spin is mainly distributed along with a quasilinear Te-O-Te-O-Te chain with the vacancies in short-bond positions relative to the central tellurium. Based on apparent analogies a similar delocalisation is suggested for the VO. centre as well. For the second new centre the 'small peroxy radical' model originally proposed for SiO2 by Edwards and Fowler (1982) has been adapted, where an oxygen interstitial is trapped next to a lattice oxygen, the latter also maintaining its bonds to both Te neighbours (Te-O2-Te).
Databáze:	OpenAIRE
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