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ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES.—II 1
Author(s) -
Fulcher G. S.
Publication year - 1925
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.1151-2916.1925.tb18582.x
Subject(s) - devitrification , viscosity , series (stratigraphy) , thermodynamics , mineralogy , analytical chemistry (journal) , composition (language) , materials science , chemistry , crystallization , physics , geology , chromatography , paleontology , linguistics , philosophy
Viscosity of two series of four component glasses .—The results recently reported by S. English 2 are here analyzed by the method used in a previous paper. 3 (1) Series 6SiO 2 , 1.2Na 2 O, 0.8 (CaO+MgO). The temperature at which the difference between the viscosity of a glass and the viscosity of 6SiO 2 ,2Na 2 O at the same temperature makes a sharp bend is called the aggregation temperature T a . It seems to correspond to the devitrification temperature. For this series T a reaches a sharp minimum for the composition 6SiO 2 , 1.15Na 2 O, 0.45MgO, 0.39CaO. The viscosity for any temperature also reaches a minimum at or near this composition. (2) Series 6SiO 2 , 1.1Na 2 O, 0.9 ( CaO+Al 2 O 3 ). The curves are similar to those for the first series, TA reaching a sharp minimum for the composition 6SiO 2 , 1.11Na 2 O, 0.81Ca0, 0.14Al 2 O 3 .