The Oxidation Reduction Equilibria and Optical Absorption of Copper Ions in Alkali Silicate Glasses

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  • けい酸アルカリガラス中の銅イオンの酸化還元平衡と光吸収
  • 珪酸アルカリガラス中の銅イオンの酸化還元平衡と光吸収
  • ケイサン アルカリ ガラスチュウ ノ ドウ イオン ノ サンカ カンゲン ヘイ

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The Cu+-Cu2+ oxidation-reduction equilibria in binary alkali silicate glasses were studied by melting the glasses in platinum crucibles in air with 0.5mol% CuO and by making chemical analysis and measurement of optical absorption. The equilibrium concentration ratio [Cu2+]/[Cu+] in 30Na2O⋅70SiO2 melt decreased with the rise in temperature, as expected from the known behavior of oxidized-reduced ion pairs of many other multivalent elements. The ratio [Cu2+]/[Cu+] in 30R2O⋅70SiO2 melts (R=Li, Na, K, Cs) at a given temperature decreased in the order Li2O>Na2O>K2O>Cs2O, that is, with the increase in basicity of the melt, in contrary to the expectation derived from the previous results on the equilibria of many other multivalent ions. The intensity of the optical absorption at the wavelength of 800nm served in indicating the amount of Cu2+ ions in glasses and its measurement gave the similar information on the oxidation-reduction equilibria of copper ions in melts to the chemical analysis.

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