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GLASSFORMING NATURE OF OXIDES WITH SPECIAL REFERENCE TO TANTALA, TITANIA, AND BERYLLIA *
Author(s) -
Sun KuanHan,
Silverman Alexander
Publication year - 1942
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.1151-2916.1942.tb15566.x
Subject(s) - oxide , radius , mineralogy , complex oxide , inorganic chemistry , chemistry , analytical chemistry (journal) , materials science , metallurgy , organic chemistry , computer security , computer science
A bstract The ρ value of an oxide, which is defined as the ratio of the cation radius to the oxygen radius, has been considered as one of the criteria for determining whether an oxide is a network former, that is, a glassformer or an intermediate. Most of all the known network formers have ρ values smaller than 0.414, which is the limit for a tetrahedral structure. The experimental facts as to whether Ta 2 O 6 alone forms a glass are in controversy. A study of its ρ value reveals that Tanoe is probably not a glassformer. The same is true for Cb 2 O 5 . The ρ value of TiO 2 also indicates that it is not a glassformer. The small ρ value of BeO leads to the belief that BeO is an intermediate oxide in glass. Further evidence, based on the physical and chemical properties of beryllia‐containing glasses, has been established to show the validity of the viewpoint. It has been pointed out that all of the elements whose oxides are glassformers or intermediates may be grouped together in the periodic table. It has also been noted that, of all the possible oxide glassformers, the most important are SiO 2 , B 2 O 5 , P 4 O 4 , and GeO 2 .