硫黄含有アルカリホウ酸塩ガラスの着色と硫黄の存在状態

概要

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Simple binary alkali borate glasses containing sulfur were prepared by conventional melt quench method and chemical bonding states of sulfur were investigated by means of ultraviolet-visible (UV-VIS) spectroscopy, X-ray photoelectron spectroscopy (XPS) and ^<11>B MAS-NMR measurement. The glass samples were colored and colors changed with glass composition and alkali species. The blue coloration by absorption at around 585 nm was explained with the formation of S_3^-, anion spices. On the other hand, the glass samples colored in brown or red showed absorption spectrum around 450 nm because of the formation of S_x^<2-> anion (polysulfide ion) speices. S2p binding energy was around 161 eV, and this values was lower than that of orthorhombic crystalline sulfur. From these results, it was suggested that sulfur was present with a negative charge in R_2S-B_2O_3 glasses. In colored reddish brown regions, the formation of non-bridging oxygen from O1s spectrum in the glasses was noticed. Therefore, it is suggested that the formation of nonbridging oxygen in glasses largely effect the variation of sample coloration. The estimated fraction of four-coordinated boron from ^<11>B MAS-NMR measurment was nearly equal to oxide glass systems. As a result, it is assumed that the effect of sulfur on the conversion of boron coordinate number is small because of a low solubility of sulfur in this glass system.
社団法人日本セラミックス協会の論文
2002-06-01