A Study of Phase Equilibrium Diagram of Quaternary System KBr-RE (La,Sm)Br3-HBr-H2O at 25 ℃

Chem. J. Chinese Universities ›› 1997, Vol. 18 ›› Issue (2): 190.

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A Study of Phase Equilibrium Diagram of Quaternary System KBr-RE (La,Sm)Br₃-HBr-H₂O at 25 ℃

WANG Hui, RAN Xin-Quan, CHEN Pei-Heng

Department of Chemistry, Northwest University, Xi' an, 710069

Received:1996-01-29 Online:1997-02-24 Published:1997-02-24

Abstract

Abstract: Phase chemical relation of quaternary systems KBr-REBr₃-HBr (13%)-H₂O (25℃, RE=La, Sm) were determined, and the rule of phase change was also discovered bere when REare light rare earth elements.It is found from the experiment that the quaternary systems in which KBr and REBr₃ react in hydrobromic acid belong to a simple eutectic type,so the reaction mechanism for synthesizing compound K₂REBr₅ type and real action of the first step reaction can be explained with Meyer's method.Furthermore, it can be seen from comparison between the systems in this paper and the system CsBr-REBr-HBr (13%)-H₂O (25℃) that CsBr and REBr₃ acting in hydrobromic acid with each other can form doublecompound easier than KBr and REBr₃.

Key words: Quaternary system, Lanthanum (samarium) tribromide, Potassium bromide,Hydrobromic acid, Reaction mechanism

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WANG Hui, RAN Xin-Quan, CHEN Pei-Heng. A Study of Phase Equilibrium Diagram of Quaternary System KBr-RE (La,Sm)Br₃-HBr-H₂O at 25 ℃[J]. Chem. J. Chinese Universities, 1997, 18(2): 190.

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A Study of Phase Equilibrium Diagram of Quaternary System KBr-RE (La,Sm)Br₃-HBr-H₂O at 25 ℃

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