Thermal expansion of mixed‐alkali silicate glasses

Autor:	J. E. Shelby
Rok vydání:	1976
Předmět:	Alkali ions Negative deviation Chemistry Inorganic chemistry General Physics and Astronomy Thermodynamics Germanate Radius Alkali metal Silicate glass Thermal expansion
Zdroj:	Journal of Applied Physics. 47:4489-4496
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.322418
Popis:	Thermal‐expansion measurements were made for five varieties of mixed‐alkali silicate glasses (Na‐K, Na‐Rb, Na‐Cs, K‐Rb, and K‐Cs), with special emphasis on the Na‐K silicates. Negative deviations from additivity were observed in the glass transformation temperature in every case, with the deviations increasing with total alkali‐oxide concentration. Positive deviations from additivity were noted in the thermal‐expansion coefficients in all but one case (Na‐Cs), where a small negative deviation was observed. The deviations in both properties were maximized when the radius ratio of the two alkali ions was approximately 1.4, i.e., for the Na‐K glasses. These results are quite similar to those reported for mixed‐alkali germanate glasses which suggests that they are due to ion‐ion interactions rather than to gross alterations of the glass network.
Databáze:	OpenAIRE
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