期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 357, 期 14, 页码 2702-2707出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2011.02.040
关键词
Phospho-tellurite glass; Raman mode; Molecular orbital calculation
资金
- Grants-in-Aid for Scientific Research [21360172] Funding Source: KAKEN
Molecular orbital calculations of two phospho-tellurite model clusters were performed to clarify the origins of the Raman bands in the Stokes region of over 1000 cm(-1) in phospho-tellurite glasses. The Raman bands could be attributed to two components of 900-1050 cm(-1) of symmetrical stretching vibrations of PO4 units and 1050-1200 cm(-1) of anti-symmetrical stretching vibrations of PO4 units. It was also clarified that the top of the valence band of phospho-tellurite glasses consists of the lone pair electrons in a TeO4+1 unit and the bottom of the conduction band of the glass consists of the antibonding hybrids of Te 5p and O 2p orbitals in the equatorial plane of a TeO4 unit. We have developed new phospho-tellurite glasses which have the Raman gain peak of 30 times as large as silica glass or the Raman gain bandwidth of more than 1200 cm(-1). (C) 2011 Elsevier B.V. All rights reserved.
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