研究目的
The objective of the study was to find such TOT conditions which could provide, as neutron irradiation does, an expanded range of complex centers in WGO, and to test the thermal stability of such defects.
研究成果
Complex centers can be created in wide-gap anion-deficient oxides by thermo-optical treatment, similar to those formed by fast particle irradiation, but with higher thermal stability. Effective TOT conditions were identified, and the method offers new opportunities for modifying material properties for applications like laser and infrared technologies.
研究不足
The study notes that diffusion processes for oxygen vacancies require longer TOT times due to small diffusion coefficients, and accurate data on these coefficients are not available. The mechanism is suggested to be threshold-based, but further verification is needed.
1：Experimental Design and Method Selection:
The study used thermo-optical treatment (TOT) involving annealing and simultaneous UV irradiation to create complex centers in anion-deficient oxide crystals. Methods included optical absorption (OA), X-ray luminescence (XL), photoluminescence (PL), and thermoluminescence (TL) spectroscopy to characterize defects.
2：Sample Selection and Data Sources:
Anion-deficient crystals of corundum (α-Al2O3-δ) and beryllium oxide (BeO1-δ) were used. Anion deficiency was created by additive coloring or growth in a reducing medium. Impurity profiles were controlled via X-ray fluorescence and laser mass-spectrography.
3：List of Experimental Equipment and Materials:
Equipment included a mercury lamp DRT-240 with UFS-5 filter for UV irradiation, IMO-2N power meter for energy density measurement, Cary 60 spectrophotometer for OA, Cary Eclipse spectrofluorimeter for XL, PL, and TL spectra, PMT FEU-130 and FEU-142 for TL detection, and X-ray source (Rh-anode, 30 kV, 5 μA) for test doses.
4：Experimental Procedures and Operational Workflow:
TOT was performed at temperatures from 670 to 1200 K for 0–60 min with UV energy density from 0 to 30 J/cm2. Samples were subjected to isochronal annealing with OA measurements after each step. TL was recorded at heating rates of 2 K/s.
5：Data Analysis Methods:
Changes in OA band intensities were analyzed to determine defect concentrations. TL curves and spectra were compared to identify complex centers.
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Spectrophotometer
Cary 60
Agilent Technologies
Used to examine optical absorption spectra.
Cary 60 UV-Vis Spectrophotometer
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Spectrofluorimeter
Cary Eclipse
Agilent Technologies
Used to study X-ray luminescence, photoluminescence, and thermoluminescence spectra.
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Mercury lamp
DRT-240
Used for ultraviolet irradiation during thermo-optical treatment.
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Filter
UFS-5
Used with the mercury lamp to filter UV light.
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Power meter
IMO-2N
Used to measure the supplied energy density during TOT.
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PMT
FEU-130
Photomultiplier tube used for recording thermoluminescence in the 300–600 K range.
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PMT
FEU-142
Solar blind photomultiplier tube used for recording high-temperature thermoluminescence in the 600–900 K range.
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X-ray source
Used for applying test doses of X-ray radiation.
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