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Nature of Glasses

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Phase Change Materials

Abstract

Glasses exist in threegeneric elastic phases: flexible, intermediateand stressed-rigid, which are determined by the connectivity of their backbones. Measurements of glass transition temperatures (T gs) using modulated-differential scanning calorimetry permits distinguishing these phases by their characteristic non-reversing enthalpies (ΔH nr) at T gs. In Raman scattering, characteristic elastic power-laws are observed in intermediate and stressed-rigid phases. Liquid fragilities are found to correlate with ΔH nr terms in covalent networks but not in modified oxide or H-bonded networks. In the latter systems weak network links exist, which cease to constrain networks as the temperature T > T g and viscosities plummet. Intermediate phase glassesare composed of rigid but unstressed networks that are in a state of quasi-equilibriumand age minimally. Such glasses usually form space filling networks and are structurally self-organized.

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Authors and Affiliations

  1. University of Cincinnati, 820 Rhodes Hall, Cincinnati, OH, 45221-0030, USA

    Punit Boolchand (Professor of ECECS and Physics)

  2. Laboratoire de Physique Théorique de la Matière Condensée, CNRS UMR 7600, Université Pierre et Marie Curie, Boite 121, 4 place Jussieu, 75252, Paris Cedex 05, France

    Prof. Matthieu Micoulaut

  3. Department of Electrical and Computer Engineering, University of Cincinnati, Cincinnati, OH, 45221-0030, USA

    Dr. Ping Chen

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  1. Punit Boolchand
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Correspondence to Punit Boolchand .

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  1. IBM Almaden Research Center, 650 Harry Road, San Jose, CA, 95120, USA

    Simone Raoux

  2. 1. Physikalisches Institut (1A), RWTH University of Technology, 52056, Aachen, Germany

    Matthias Wuttig

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Boolchand, P., Micoulaut, M., Chen, P. (2009). Nature of Glasses. In: Raoux, S., Wuttig, M. (eds) Phase Change Materials. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-84874-7_3

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