Open AccessTHE HIGH PRESSURE MODIFICATION OF LITHIUM POTASSIUM SULPHATE (LiKSO4) AND ITS P-T PHASE DIAGRAM ABOVE ROOM TEMPERATURE
Author(s) -
Zhongyi Shen,
Jingzhú Hu,
Yun Zhang,
Yin Xiu-Jun
Publication year - 1987
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.36.308
Subject(s) - orthorhombic crystal system , phase diagram , lithium (medication) , potassium , materials science , high pressure , diamond anvil cell , phase (matter) , phase transition , analytical chemistry (journal) , thermodynamics , diffraction , thermal expansion , diagram , crystallography , chemistry , crystal structure , optics , composite material , metallurgy , chromatography , physics , medicine , statistics , mathematics , organic chemistry , endocrinology
The high pressure transition and phase equilibrium beheviour of lithium potassium sulphate (LiKSO4) were studied by an improved high pressure DTA method and X-ray diffraction in a diamond anvil cell at elevated temperatures. The P-T phase diagram was accurately determined up to 3GPa and 800℃. A high pressure modification of LiKSO4 was observed beyond 1.65 GPa. The structure was determined to be orthorhombic with a = 7.933 ?, b = 9.493 ? and c= 9.679 ?, and its thermal expansion at high pressure and the stability of the quenched sample at normal pressure were also examined.