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VOLUME 40 (1984) | ISSUE 7 | PAGE 283
Thermal expansion of glasses at low temperatures
The thermal-expansion coefficient of a glass varies linearly with the temperature at low temperatures and is governed by the presence of two-level systems in the glass. The Gruneisen constant Γ is anomalously large (~ 102), because of the softness of the local atomic potentials in which the two-level systems occur. The primary component of the thermal-expansion coefficient is nonstationary, i.e., it depends on the experimental time t.