Physico-chemical characterization of new tellurium based chalcogenide materials
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2018-01-01
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Abstract
Bulk samples of Ge-Te-Cu system are synthesized by melt-quenched technique into a water/ice mixture. The synthesis is carried out at a constant heating rate of 5.10-2 K s-1 reaching the final temperature of 1373 K. Some physico-chemical properties of the synthesized bulk samples are defined. The density of the latter undergoes various changes with Cu content increase most likely due to the gradual substitution of tellurium atoms with copper leading to structural changes in the samples. The dependencies of the bulk samples compactness, molar volume and free volume on their composition follow that of the density. A change in the structure of GeTe4-Cu leading to extreme physico-chemical properties is observed in accordance with the theory of Thorphe for transitions in the structure of covalent chalcogenide glasses at an average coordination number 2,4. It proceeds at Zglass = 2,46 corresponding to a content of 10 mol % of Cu.