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Glassy materials with enhanced thermal stability

Published online by Cambridge University Press:  10 January 2017

P. Boolchand  and
B. Goodman
P. Boolchand
Affiliation:
Department of ECS, College of Engineering and Applied Science, University of Cincinnati, USA; [email protected]
B. Goodman
Affiliation:
Department of Physics, University of Cincinnati, USA; [email protected]
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Abstract

The nature of glass transitions in chalcogenides and modified oxides depends on the network mean coordination number $\langle r\rangle$. These display systematic trends when spanning across the three topological phases: flexible, intermediate, and stressed-rigid. Trends in the glass-transition temperature Tg($\langle r\rangle$) show a monotonic increase with $\langle r\rangle$, but the nonreversing enthalpy of relaxation at Tg, ΔHnr($\langle r\rangle$), shows a deep- and square-well-like minimum with the walls representing the rigidity and stress transitions with increasing $\langle r\rangle$, respectively. In the well, the ΔHnr($\langle r\rangle$) term remains minuscule (∼0) corresponding to the isostatically rigid intermediate phase (IP). The melt fragility index (m) shows rather low values, m($\langle r\rangle$) < 20 for IP compositions, but increases outside the IP. Glass compositions in the IP show absence of network stress, form compacted networks, possess thermally reversing glass transitions, and display high glass-forming tendency—functionalities that have attracted widespread interest in understanding the physics of glasses and applications of the new IP formed.

Keywords

topological phasesdifferential scanning calorimetryfragility indexintermediate phaseRaman scattering
Type
Research Article
Information
MRS Bulletin , Volume 42 , Issue 1: Material Functionalities from Molecular Rigidity , January 2017 , pp. 23 - 28
Copyright
Copyright © Materials Research Society 2017 

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