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Correlation between structure and physical properties of chalcogenide glasses in the AsxSe1-x system

Abstract : Physical properties of chalcogenide glasses in the AsxSe1−x system have been measured as a function of composition including the Young's modulus E, shear modulus G, bulk modulus K, Poisson's ratio ν, the density ρ, and the glass transition Tg. All these properties exhibit a relatively sharp extremum at the average coordination number ⟨r⟩=2.4. The structural origin of this trend is investigated by Raman spectroscopy and nuclear magnetic resonance. It is shown that the reticulation of the glass structure increases continuously until x=0.4 following the "chain crossing model" and then undergoes a transition toward a lower dimension pyramidal network containing an increasing number of molecular inclusions at x>0.4. Simple theoretical estimates of the network bonding energy confirm a mismatch between the values of mechanical properties measured experimentally and the values predicted from a continuously reticulated structure, therefore corroborating the formation of a lower dimension network at high As content. The evolution of a wide range of physical properties is consistent with this sharp structural transition and suggests that there is no intermediate phase in these glasses at room temperature.
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https://hal.archives-ouvertes.fr/hal-00608596
Contributor : Corinne Perier <>
Submitted on : Wednesday, July 13, 2011 - 2:52:12 PM
Last modification on : Friday, July 10, 2020 - 4:24:53 PM

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Guang Yang, Bruno Bureau, Tanguy Rouxel, Yann Gueguen, Ozgur Gulbiten, et al.. Correlation between structure and physical properties of chalcogenide glasses in the AsxSe1-x system. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2010, 82 (19), pp.195206. ⟨10.1103/PhysRevB.82.195206⟩. ⟨hal-00608596⟩

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