Open AccessX‐ray induced reduction of rare earth ion doped in Na 2 O‐Al 2 O 3 ‐B 2 O 3 glasses
Author(s) -
Shimizugawa Yutaka,
Umesaki Norimasa,
Hanada Katsumi,
Sakai Ichiro,
Qiu Jianrong
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500020598
Subject(s) - doping , ion , rare earth , materials science , reduction (mathematics) , x ray , atomic physics , crystallography , physics , chemistry , mineralogy , nuclear physics , optoelectronics , geometry , mathematics , quantum mechanics
5Na 2 O‐10Al 2 O 3 ‐85B 2 O 3 glasses doped with 0.05 mol% Sm 2 O 3 or 0.05 mol% Eu 2 O 3 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.