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Preliminary Study of the Phase Equilibria Diagram of Tho 2 ‐SiO 2
Author(s) -
HARRIS L. A.
Publication year - 1959
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.1151-2916.1959.tb14069.x
Subject(s) - eutectic system , phase diagram , monoclinic crystal system , quenching (fluorescence) , analytical chemistry (journal) , acetylene , isothermal process , materials science , mineralogy , phase (matter) , chemistry , thermodynamics , metallurgy , crystallography , microstructure , chromatography , fluorescence , physics , organic chemistry , crystal structure , quantum mechanics
A preliminary study of the system Tho 2 ‐SiO 2 supported the premise that the system CaF 2 BeF 2 is a model for this silicate system. The only compound present was the monoclinic form of ThSiO 4 (huttonite), which melted incongruently to Tho 2 and liquid at 1975° f 50° C. as determined from a series of powder X‐ray spectrometer patterns. The eutectic temperature as tentatively determined is 1700°± 10°C. at a composition of greater than 95% by weight of Sio 2 . No solid‐solution areas were observed. The quenching samples were fired in a modified oxygen‐acetylene furnace which was developed to insure accurate temperature readings and to retain the effects of heating the samples in air.