Shimizugawa Y, Umesaki N, Hanada K, Sakai I, Qiu J
Osaka National Research Institute, AIST, Midorigaoka, Ikeda, Japan.
J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):797-9. doi: 10.1107/s0909049500020598.
5Na2O-10Al2O3-85B2O3 glasses doped with 0.05 mol% Sm2O3 or 0.05 mol% Eu2O3 turn to orange after irradiation by focussed femtosecond pulsed laser or x-ray irradiation. To know the mechanism of photo-induced coloring, the glasses were studied by Sm or Eu L(III) XANES before and after x-ray or UV irradiation. XANES in both edges showed that a part of trivalent ion converted to divalent ion upon the irradiation of x-ray. These facts reveal that photoreduction of rare earth ion is the mechanism of photo-induced coloring. However no photoreduction upon UV irradiation occurred in both glasses.
掺杂0.05摩尔% Sm₂O₃或0.05摩尔% Eu₂O₃的5Na₂O - 10Al₂O₃ - 85B₂O₃玻璃在聚焦飞秒脉冲激光照射或X射线照射后会变成橙色。为了了解光致变色的机制，在X射线或紫外线照射前后，通过Sm或Eu L(III) XANES对玻璃进行了研究。两个边缘的XANES表明，在X射线照射时，一部分三价离子转化为二价离子。这些事实表明，稀土离子的光还原是光致变色的机制。然而，两种玻璃在紫外线照射下均未发生光还原。
