Response to comment on “The glassy state of matter: Its definition and ultimate fate”

Edgar D. Zanotto, John C. Mauro

Research output: Contribution to journalComment/debatepeer-review

2 Scopus citations


The comment by Popov raises two questions related to (a) whether the glassy state can more appropriately be described as metastable or unstable and (b) whether the supercooled liquid state exists below the glass transition temperature, Tg. We argue that the glassy state is thermodynamically unstable, as it continuously and spontaneously relaxes toward the metastable supercooled liquid state at any nonzero temperature. Moreover, the supercooled liquid state—the target for the glass relaxation process—exists at any temperature below the liquidus temperature of a system. There is no problem with having a missing target for the glass relaxation process, since this metastable supercooled liquid state can always be defined.

Original languageEnglish (US)
Pages (from-to)251-252
Number of pages2
JournalJournal of Non-Crystalline Solids
StatePublished - Dec 15 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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