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Optical absorption and photoconductivity investigations of nominal pure and Mg²⁺ doped β-Ga₂O₃ single crystals have been carried out. Additional bands in the UV (3.6-4.6 eV) and near-IR (0.4-1.2 eV) spectral regions were found in optical absorption and photoconductivity spectra. A correlation between Mg²⁺ doping, annealing in oxygen atmosphere as well as optical absorption and photoconductivity bands...
Optical absorption and the yield stress value of NaCl : Ni^{2+} crystals were measured as functions of the annealing temperature. Morphology and possible structure types of the NiCl_{2} particles formed under different annealing conditions have been shortly discussed.
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