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Thermal Conductivity of Li 2 O·Al 2 O 3 · n SiO 2 Glass‐Ceramics between 5 and 100 K
Author(s) -
Hanna Baher,
Bohn Randy G.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb04298.x
Subject(s) - thermal conductivity , materials science , amorphous solid , ceramic , conductivity , mineralogy , composite material , analytical chemistry (journal) , glass ceramic , chemistry , crystallography , chromatography
The thermal conductivity of Li 2 O·Al 2 O 3 · n SiO 2 glass‐ceramics is studied for n = 4, 6, 8, 10 between 5 and 100 K. A monotonic increase in conductivity is observed for all samples. This behavior is different from that of glassy counterparts which exhibit a plateau in thermal conductivity between 10 and 20 K. It is also observed that while the conductivity of glass‐ceramics is lower than that of glasses at low temperatures, the situation is reversed at higher temperatures. A crossover occurs around 40 K for all studied samples. The glass‐ceramic behavior is interpreted in the light of the acoustic mismatch theory of Little. At low temperatures, the thermal boundary resistance that exists at the crystalline‐amorphous mismatch is high and the thermal conductivity is low. At higher temperatures, the boundary resistance is very small and the high conductivity is mainly due to the crystalline region within the amorphous structure.