Magnetic resonance studies on radiation-induced point defects in mixed oxide glasses. I. Spin centers in B2O3 and alkali borate glasses

• Published in: Journal of non-crystalline solids Vol. 262; no. 1-3; pp. 6 - 34
• Main Authors: SHKROB, I. A, TADJIKOV, B. M, TRIFUNAC, A. D
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.02.2000
• Subjects: Color centers and other defects; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Disordered solids; Disordered structures; amorphous and glassy solids; Electron paramagnetic resonance and relaxation; Electron states; Exact sciences and technology; Glasses; Impurity and defect levels; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Physics; Structure of solids and liquids; crystallography; Defect states; Inorganic compounds; Point defects; ESR; Physical radiation effects; Metastable states; Electron beam; Experimental study; Borate glasses; Local structure; Electronic structure; Modelling; Ab initio calculations; Semiempirical method; Atomic structure
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/s0022-3093(99)00668-7

Radiation-induced spin centers in vitreous boron trioxide and alkali borate glasses were studied using pulsed EPR. Electrons and holes in these glasses are trapped on valence alternation defects, undercoordinated O (holes) and overcoordinated O (electrons). The local environment around these defects has major effect on spin parameters of the corresponding spin centers. The electronic and atomic structure of spin-1/2 centers and their diamagnetic precursors is analyzed using semiempirical and ab initio calculations. 58 refs.