アルカリケイ酸塩ガラスのX線光電子スペクトル

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X-ray photoelectron spectra were measured on the fresh surfaces of silica, binary alkali silicate and mixed alkali silicate glasses fractured in ultra-high vacuum by irradiating with focusing monochromatic Al Ka X-ray. Binding energies and chemical shifts of O1s, Si2p, Li1s, Nals, K2p, Rb3d_<5/2> and Cs4d_<5/2> have been investigated, and charge densities of oxide, silicon and other alkali ions have been discussed. For xNa_2O・(100 -x)SiO_2 glasses, electron densities of bridging oxide ion (BO), non-bridging oxide ion (NBO) and sodium ions increased with increasing the Na_2O content, suggesting that the bond order between O2p and Na3s (or 3p) increased with increasing the Na_2O content. In addition, the difference in binding energies between BO1s and NBO1s decreased with increasing Na_2O content indicating that electrons were delocalized considerably in O2p-Si3d π bonds. For 33.3R_2O・66.7SiO_2 (R=Li, Na, K, Rb, Cs) glasses, charge densities of BO increased with increasing ionic radius of alkali ions (Li→Na→K, Rb→Cs). The degree of polarization of BO increased with increasing ionic radius of alkali ions. For 33.3 { (1 - y) Li_2_O・yCs_2O}・66.7SiO_2 glasses, O1s peak of NBO could not been discriminated between the components belonging to Si-O-…Li^+ and Si-O^-… Cs^+. O1s chemical shifts of 33.3 {(1-x)Li_2O・xCs_2O}・66.7SiO_2 glasses with increasing Cs_2O content were similar to the shifts of 33.3R_2O・66.7SiO_2 glasses with increasing ionic radius of alkali ions. The area-weighed mean values of O1s peaks appeared to have good correlation with an empirieal expression of optical basicity.
1998-04-01

アルカリケイ酸塩ガラスのX線光電子スペクトル

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