Structural Analysis of MeO(MeO=CaO, ZnO)-SiO<SUB>2</SUB> Glasses

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  • MeO(MeO=CaO, ZnO)-SiO<SUB>2</SUB>珪酸塩ガラスの構造解析
  • MeO(MeO=CaO,ZnO)-SiO2珪酸塩ガラスの構造解析
  • MeO MeO CaO ZnO SiO2 ケイサンエン ガラス ノ コウゾウ

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To investigate the structure of binary silicate in the composition range MeO/SiO2>1, O1s spectra in MeO (MeO=CaO, ZnO)-SiO2 glasses were measured by means of X-ray Photoelectron Spectroscopy (XPS) and quantitative analysis for the existence ratios of silicate anions was carried out by the Trimethylsilylation (TMS) method.<BR>The results were summarized as follows:<BR>(1) The measured O1s XPS spectra were fitted precisely by the curve fitting method using the following function with α=0.75. The analyzed value of the oxygen ions (i.e. O0, O−, O2−) in crystalline silicate were in good agreement with the theoretical existence ratios of the oxygen ions.<BR>(This article is not displayable. Please see full text pdf.) <BR>(2) Equilibrium constants K for the chemical reaction 2O−=O\hat0+O\hat2− in binary silicate, calculated from the analysis of O1s spectra, were 0.0013 in the CaO system and 0.037 in the ZnO system, respectively.<BR>(3) Polysilicate anions in the composition range of 66.7 to 60 mol% ZnO showed the average polymerization degree of nO0⁄nSi=1.

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