Thermal conductivity and specific heat of glass ceramics

D. G. Cahill, J. R. Olson, Henry E. Fischer, S. K. Watson, R. B. Stephens, R. H. Tait, T. Ashworth, R. O. Pohl

Research output: Contribution to journalArticlepeer-review


The effect of crystallization on the lattice vibrations of two glass ceramics, a magnesium aluminosilicate (Corning Code 9606) and a lithium aluminosilicate (Corning Code 9623), is studied through measurements of the thermal conductivity and specific heat below 300 K. Because of grain boundaries and magnetic impurities, measurements below a few kelvins are of limited value. At higher temperatures, however, the experimental results show that the lattice vibrations of one of the glass ceramics (Code 9606) change from glassy to crystalline upon crystallization. Those of Code 9623, however, remain glassy even in the fully crystallized state. In contrast to the crystalline Code 9606 sample, the Code 9623 sample accommodates large concentrations of interstitial lithium and magnesium ions in its crystal lattice, and it is suggested that the glasslike lattice vibrations in the Code 9623 sample are caused by these ions.

Original languageEnglish (US)
Pages (from-to)12226-12232
Number of pages7
JournalPhysical Review B
Issue number22
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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