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Quenched Metastable Glassy and Crystalline Phases in the System Lithium‐Sodium‐Potassium Metatantalate
Author(s) -
NASSAU KURT,
WANG CHRISTINE A.,
GRASSO MICHAEL
Publication year - 1979
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.1151-2916.1979.tb18810.x
Subject(s) - metastability , pyrochlore , lithium (medication) , differential thermal analysis , materials science , phase (matter) , potassium , crystallography , solid solution , sodium , diffraction , mineralogy , analytical chemistry (journal) , chemistry , optics , metallurgy , medicine , physics , organic chemistry , chromatography , endocrinology
A twin‐roller apparatus was used to quench 21 melts in the three pseudobinary systems and in the pseudoternary system composed of LiTaO 3 , NaTaO 3 , and KTaO 3 . Glasses were obtained in all but the high‐Na region. X‐ray diffraction and differential thermal analysis studies of the metastable compositions showed that there were two metastable crystalline phases when the materials crystallized; one phase was a defect pyrochlore structure centered at KTaO 3 and the other appeared at Li 0.8 K 0.2 TaO 3 . The metastable phases subsequently transformed into the expected stable phases on heating. There is some evidence for a subsolidus two‐glass region in the system (K,Na)TaO 3 .