ガラスの放射線着色に対するセリウムの着色防止機構について

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Glasses containing various amount of trivalent cerium ion (20 K_2O, 10 BaO, 70 SiO_2' 0.1 CeO_2,and O〜0.2 Si (mole %) were first expose.d to r-radiation until they were colored to the same degree, and then, the fading of their color occurred with the lapse of time was measured. The content of Ce^<3+> ion in these glasses was also measured by the spectrophotometric method in order to obtain a relation between its content in the glasses and the fading velocity of their r-ray induced color. The result showed that the higher the con-tent of Ce^<3+> ion in the glass is, the higher the fading velocity of its color is. On the basis of this result and the results of the spectrophotometric studies on the cerium-containing glasses so far made by the authors (J. Ceram. Assoc. Japan. 68,132 ; 169 (1960)), the authors gave their view on the role of Ce^<3+> ion in preventing the r-ray induced coloration of glass : Being excited by r-ray irradiation, oxygen ions in glass loose .some of their electrons. The Ce^<3+> ions give their weak-bonded 4 f-electrons to the oxygen ions, thus preventing the formation of V-center like defects in glass. At the same time, the Ce^<3+> ions, now holding positive holes as the result of their lending their 4 f-electrons to the oxygens, catch the ionized electrons that would be trapped or were already trapped by oxygen ion vacancies, thus preventing the formation of F-center like defects in glass. The total function of the Ce^<3+> ion in glass under r-ray irradiation is, therefore, the recombination of the positive holes and the ionized electrons, thus preventing the formation of color centers.
社団法人日本セラミックス協会の論文
1962-05-01

ガラスの放射線着色に対するセリウムの着色防止機構について

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