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Low-temperature heat capacity of sodium borosilicate glasses at temperatures from 13 K to 300 K

✍ Scribed by Isao Yamashita; Takeo Tojo; Hitoshi Kawaji; Tooru Atake; Yannick Linard; Pascal Richet

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
158 KB
Volume
33
Category
Article
ISSN
0021-9614

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✦ Synopsis

Thermodynamic properties of sodium borosilicate glasses {56.7 SiO 2 , (43.7 -x) B 2 O 3 , xNa 2 O} where x = 14.4, 22.9, and 32.5, have been studied. The heat capacity was measured using an adiabatic calorimeter at temperatures between 13 K and 300 K. The thermodynamic functions were calculated from the smoothed values of C p,m . The results differ from an additive model with pure glassy SiO 2 , B 2 O 3 , and crystalline Na 2 O as components. A model based on the assumption that the contribution of structural units of glasses to the heat capacity is equal to those of glasses with the same molecular formula is proposed.

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