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Investigation of the Phase Diagram for the Pseudobinary System Li 2 SO 4 –La 2 (SO 4 ) 3 and Its Ionic Conductivity
Author(s) -
Zhang Chai,
JingKui Liang,
Xianting Xu
Publication year - 1988
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.1151-2916.1988.tb07520.x
Subject(s) - eutectic system , phase diagram , monoclinic crystal system , ionic conductivity , differential thermal analysis , materials science , analytical chemistry (journal) , activation energy , phase (matter) , ionic bonding , ion , crystallography , diffraction , chemistry , crystal structure , microstructure , metallurgy , physics , electrolyte , organic chemistry , electrode , chromatography , optics
The phase diagram of the pseudobinary system Li 2 SO 4 –La 2 (SO 4 ) 3 has been investigated by means of X‐ray diffraction and differential thermal analysis. LiLa(SO 4 ) 2 is formed by a peritectic reaction in this system; the peritectic temperature is 653±3°C. The eutectic reaction of Li 2 SO 4 and LiLa(SO 4 ) 2 occurs at 553±3°C; the composition at the eutectic point is 17 mol% La 2 (SO 4 ) 3 . LiLa(SO 4 ) 2 is monoclinic with a=1.375 nm, b=0.6744 nm, c=0.7068 nm, and β=105.4°. The ionic conductivity of LiLa(SO 4 ) 2 has been studied from room temperature to 350°C and is found to be relatively low at room temperature or at lower temperatures. Its activation energy is 0.66 eV. Thus it is not suitable as a fast ion conductor.