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Studies in Lithium Oxide Systems: XIII, Li,O.Al2O 3 .2SiO 2 ‐Li 2 O.Al2O 3 .2GeO 2
Author(s) -
TlEN T. Y.,
HUMMEL F. A.
Publication year - 1964
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.1151-2916.1964.tb13822.x
Subject(s) - thermal expansion , solid solution , solubility , silicate , mineralogy , oxide , materials science , diffraction , analytical chemistry (journal) , lithium (medication) , chemistry , physics , metallurgy , optics , medicine , organic chemistry , endocrinology , chromatography
Complete solid solubility was demonstrated to occur between LiAlGeO 4 and the low temperature form of Li AlSiO 2 (a‐eucryptite). Hydrother‐mal preparation was necessary for the silicate‐rich compositions. Under atmospheric pressure, about 65 mole % LiAlGeO 4 entered the β‐eucryβ‐tite phase at 1150°C, but solid solutions containing more than 25 mole % LiAlGeO4 exsolved if held at lower temperatures. Directional thermal expansion data were obtained by X‐ray diffraction methods on both α‐ and β‐eucryptite and their solid solutions. Substitution of Ge 4+ for Si 4+ produced no significant difference in the thermal expansion coefficients in the α and β phases. An increase in the lattice parameters in the a and c directions took place as expected when Ge 4+ (0.53 A) was substituted for Si 4+ (0.39 A).