分析化学(期刊)
石英
退火(玻璃)
吸收(声学)
吸收带
熔融石英
吸收光谱法
谱线
化学
硅
材料科学
光学
冶金
复合材料
物理
色谱法
天文
作者
Nobu Kuzuu,Hideharu Horikoshi,Tsutomu Nishimura,Yosuke Kokubo
摘要
Effects of heat treatment on absorption bands in fused quartz produced by melting natural quartz powder containing 2×1017 cm−3 (sample I) and 1.3×1019 cm−3 of OH (sample II) were studied. Both samples have an absorption peak at ≈5.2 eV. Fluorescent spectra and the results of Gaussian peak decomposition suggest that this absorption is associated with the B2β band with a peak at 5.15 eV and full width at half maximum of 0.42 eV. The 5.15 eV band and an absorption component at 7.5 eV in sample II were annealed out at 1423 K, whereas almost no change was observed in the absorption spectra of sample I. The decrement of the 5.15 and 7.5 eV bands was proportional to the decrement of the OH content. The annealing mechanism in sample II can be explained using a previously proposed model for OH-containing fused quartz wherein the B2β band is the twofold-oxygen-coordinated silicon (=Si:) coordinated with two ≡Si-OH structures. Sample I must have a =Si: structure, but it may not be annealed out because it does not have sufficient OH to form the twofold-coordinated ≡Si-OH on =Si:. The origin of the other absorption bands was also discussed.
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