Browsing by Author "Kritz, Antje"
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- ItemSpectroscopic investigations of glasses with semiconductor microcrystals at higher temperatures(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1994) Kritz, Antje; Müller, MatthiasGlasses containing microcrystals of CuBr or CuCl show two characteristic absorption peaks caused by excitonic transitions. If temperature is increased the peaks become wider and flatter, whereas the complete disappearance o f the excitonic peaks takes place in a narrow temperature range of 30 to 50 K. Absorption intensity in the UV region (at about 30 000 cm⁻¹) increases simultaneously. The reason for these reversible changes is the melting of the microcrystals about 200 K below the melting point of the corresponding bulk crystals. The melting point depends on size and composition of the microcrystals.