LATTICE-DYNAMIC ASPECTS IN PHOTOEXCITED CHALCOGENIDE GLASSES

被引:26
作者
UTSUGI, Y [1 ]
MIZUSHIMA, Y [1 ]
机构
[1] HAMAMATSU PHOTON KK,HAMAKITA 434,JAPAN
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1992年 / 31卷 / 12A期
关键词
CHALCOGENIDE GLASS; PHOTOSTRUCTURAL CHANGE; PHOTODARKENING; PHOTOEXPANSION; PHOTOCHEMICAL EFFECT; PHOTODOPING; LATTICE DYNAMICS; LATTICE RANDOMNESS; FICTIVE TEMPERATURE; ELECTRON-PHONON COUPLING;
D O I
10.1143/JJAP.31.3922
中图分类号
O59 [应用物理学];
学科分类号
摘要
Lattice-dynamical aspects are coherently applied to the reversible photostructural change (PSC) effect and associated phenomena in chalcogenide glasses. Far-infrared, X-ray photoelectron and optical absorption measurements reveal that photo-induced distortions and quenching in lattice configurations are characterized by increased randomness, which can be reversed by thermal annealing for full recovery. A statistical analysis reveals clearly that PSCs such as photodarkening and photoexpansion are essentially equivalent to a thermally frozen-in effect. The PSCs can be directly traced to the strong electron-lattice coupling and localized bond strain of chalcogenide glasses. A lattice-dynamic energy diagram highlights the importance of the quadratic-term of atomic distortion (deltaq)2 in relating PSC to the glass transition phenomenon. The photochemical and photodoping effects are then described, on the same basis, in terms of the lattice fluctuation and high fictive temperature.
引用
收藏
页码:3922 / 3933
页数:12
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