Fast-track communication Meeting experimental challenges to physics of network glasses: Assessing the role of sample homogeneity
نویسندگان
چکیده
We introduce a Raman profiling method to track homogenization of GexSe100−x melts in real time, and show that 2 g melts reacted at 950 °C in high vacuum homogenize in 168 h on a scale of 10μm. Homogenization of melts is precursive to self-organization of glasses. In the present glasses, compositional variation of Raman active corner-sharingmode frequency of GeSe4 units,molar volumes, and the enthalpy of relaxation at Tg , reveal the rigidity (xc(1) = 19.5(3)%) and the stress (xc(2) = 26.0(3)%) transitions to be rather sharp (∆x < 0.6%). These abrupt elastic phase transitions are in harmony with rigidity theory and have a direct bearing on the physics of glasses. © 2011 Elsevier Ltd. All rights reserved.
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