感光オパールガラスの基礎的研究 : 紫外線照射時間と透明性の関係

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An opal type of photosensitive glass, when exposed to ultraviolet light and subsequently heated to about its softening temperature, changes in transparency due to the formation of nonmetallic submicroscopic crystallites within the glass. In this study the transparency change of the glass having the following composition was studied in relation to the exposure time: SiO2 81, Li2O 12.5, K2O 2.5, Al2O3 4, CeO2 0.03, Au 0.027% by weight.Glass specimens of 2mm thick plates were exposed to ultraviolet light by placing the near a 500 watt high pressure mercury lamp at a distance of 10cm for various times ranging from 1 to 1000 min. After exposure all of specimens were heated firstly at 510°C for 30 min. and then at 620°C for 60 min. to cause the formation of gold nuclei and lithium metasilicate crystallites at respective temperatures. The measuremeat of light transmittance in the visible region was made of these specimens with a photoelectric spectrophotometer.It was found that (1) the transparency decreases with increasing exposure time up to 30 min. (due to the formation of metasilicate crystallites); (2) between 30 and 180 min., however, it increases with increasing exposure time; the specimen with the exposure time of 180 min. is almost transparent though its color is deep red; (3) over 180 min. it again decreases with increasing exposure time.The peculiar change in transparency with increasing exposure time was discussed on the basis of the size of lithium metasilicate crystallites within the glass. The increase in transparency with increasing exposure time in the range between 30 and 180 min, was attributed to the decrease of the size of crystallites under a limiting value which is too small for scattering visible light within the glass. The density measurement by a sink-float method was also made to support this conclusion.
社団法人日本セラミックス協会の論文
1959-08-01

感光オパールガラスの基礎的研究 : 紫外線照射時間と透明性の関係

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