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Ge nanocrystals embedded in bulk SiO 2 glasses were prepared by combining the sol–gel process and the heat treatment in a H 2 gas atmosphere. The size of Ge nanoparticles decreases with a decrease in the heat treatment temperature in a H 2 gas atmosphere, and thus the crystalline Ge–Ge phonon vibration mode shifts to lower frequencies. The SiO 2 gel glasses doped with...
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