Transformation of the excitation energy in aniondefective corundum.
Some regular features of the excitation energy transformation in anion-defective crystals of alpha-Al2O3 were analysed by the sub-nanosecond spectroscopic method. The samples were excited using synchrotron radiation and high-density pulsed electron beams. It was shown that much of the energy of the ionising radiation absorbed by the crystals was liberated as the luminescence of F- and F-centres immediately at the moment of irradiation. Luminescence of F+-centres dominated in the nanosecond range, while luminescence of F-centres prevailed in the millisecond range. The excitation energy transformation processes and their kinetics were governed by the temperature, the concentration ratio of intrinsic defects in alpha-Al2O3 crystals, and the excitation density.
Surdo
A I
AI
Ural State Technical University, Ekaterinburg, Russia. ais@dpt.ustu.ru
Kortov
V S
VS
Pustovarov
V A
VA
Yakovlev
V Y
VY
D000537:Aluminum Oxide / Q000737:chemistry / Q000528:radiation effects*; D000838:Anions; D007700:Kinetics; D011854:Radiochemistry; D013816:Thermodynamics; D013819:Thermoluminescent Dosimetry / Q000379:methods* / Q000706:statistics & numerical data
D000838:Anions; D000537:Aluminum Oxide