ISSN:
1432-0630
Keywords:
61.80
;
78.50
;
76.30
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The changes induced by ultraviolet (UV) illumination on the optical absorption and electron paramagnetic resonance (EPR) spectra of Bi4Ge3O12 single crystals, doped either with Fe (and Gd) or Mn, have been followed at room temperature (RT). In both crystals several overlapping optical absorption bands develop under UV illumination, covering from ≈ 0.7 eV up to the band edge of the matrix. The optical damage can be bleached by heating the samples above RT or by illumination with visible light. Although these optical changes temporarily correlate with the variation of the Gd3+ and Mn2+ concentrations, it has been concluded that other defects are present and partially responsible for the optical damage.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00324770
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