Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 8, Issue -, Pages 797-799Publisher
MUNKSGAARD INT PUBL LTD
DOI: 10.1107/S0909049500020598
Keywords
photo-induced coloring; Eu3+ or Sm3+-doped aluminoborate glasses; L-III XANES
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5Na(2)O-10Al(2)O(3)-85B(2)O(3) 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.
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