Photon-Induced Redox Reactions in Amorphous Materials

利用<TO_2>ESR、拉曼散射、光吸收和光致发光等方法研究了（T= Si或Ge）熔体的高温热分解反应和玻璃中Ge或P的光致氧化还原反应<SiO_2>。提出了一个模型反应，它可以完全解释缺陷的形成<SiO_2>或<SiO_2>：<GeO_2>玻璃。它们是E ′、NBOHC、T-T同键、过氧键（或O-O同键）和T-O或T-O<II>种类。初始反应是T-O键在高温下的自由基分解，缺陷是初始自由基物种间二次反应的产物。净反应用~ <2TO_2>2 TO ~+<O_2>表示，它预示了玻璃制备过程中自由基种类浓度的变化<pO_2>，在低温下用~-射线照射玻璃时，锗俘获电子，空穴被氧俘获。这与磷掺杂玻璃的结果相似。

Thermal decomposition reaction of <TO_2> (T=Sior Ge) melts at high temperature and photon-induced redox reactions related to Ge or P in <SiO_2> glasses were studied by use of ESR, Raman scattering, optical absorption and photo-luminescence. A model reaction was proposed which can totally explain formation of the defects detected in <SiO_2> or <SiO_2> : <GeO_2> glasses. They are E', NBOHC, T-T homobonds, peroxy linkages (or O-O homobonds) and T O or T( <II> ) species. The initial reaction is radical decompositionof T-O bonds at high temperatures and the defects are product of secondary reactions between the initial radical species. The net reaction is expressed as <2TO_2> 2TO+ <O_2> , Which predicts the dependence of concentration of the radical species on <pO_2> during glass preparation.Germanium traps an electron upon low temperature-irradiation of the glasses with -ray and the positive hole is trapped on an oxygen. This is similar to the results for the phosphorus-doped glasses.