Premium
The System K 2 SO 4 ‐Cs 2 SO 4
Author(s) -
LEVIN ERNEST M.,
BENEDICT JOSEPH T.,
SCIARELLO JAMES P.,
MONSOUR S.
Publication year - 1973
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.1151-2916.1973.tb12716.x
Subject(s) - eutectic system , solidus , orthorhombic crystal system , phase diagram , congruent melting , solid solution , isothermal process , solubility , analytical chemistry (journal) , phase (matter) , melting point , solid solubility , materials science , hexagonal crystal system , crystallography , crystal structure , chemistry , thermodynamics , microstructure , physics , organic chemistry , alloy , metallurgy , chromatography , composite material
The phase diagram for the system K 2 SO 4 ‐Cs 2 SO 4 was determined by using DTA for melting relations and DTA and high‐temperature X‐ray diffractometry for subsolidus relations. At the solidus the system shows complete solid solubility, with a minimum at 940°C and 50 mol% Cs 2 SO 4 . Orthorhombic K 2 SO 4 and Cs 2 SO 4 , the stable low‐temperature forms, show mutual solid solubility and form a eutectoid at 50 mol% Cs 2 SO 4 and 430°C, the lowest temperature of stability of the high‐temperature hexagonal solid‐solution phase. Isothermal plots of the a and c dimensions of this hexagonal phase vs composition show large positive deviations from linearity for c. These deviations are interpreted on the basis of the crystal structure of KNaSO 4 with a similar unit cell.