Premium
Rare‐Earth Aluminosilicate Glasses
Author(s) -
Shelby James E.,
Kohli Jeffrey T.
Publication year - 1990
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.1151-2916.1990.tb05087.x
Subject(s) - aluminosilicate , rare earth , thermal expansion , mineralogy , materials science , ion , aluminium , alkaline earth metal , analytical chemistry (journal) , chemistry , metallurgy , metal , organic chemistry , catalysis
Rare‐earth aluminosilicate glasses of the general formula 20R 2 O 3 · 20Al 2 O 3 · 60SiO 2 have been formed for 10 of the 14 possible rare‐earth oxides. Two series of “mixed‐rare‐earth” glasses were also formed (Nd/Er and Nd/Y). These glasses exhibit exceptionally high glass transformation temperatures, moderate thermal expansion coefficients, and refractive indices of approximately 1.65. The glass transformation temperature and thermal expansion coefficients vary linearly with the field strength of the rare‐earth ion. No evidence of a “mixed‐rare‐earth effect” was observed. MAS‐NMR indicates that the aluminum ions are tetrahedrally coordinated in at least some of these glasses.