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Sur la séparation des terres rares XI. Systèmes de solubilité binaires et ternaires comprenant des nitrates des terres cériques
Author(s) -
Brunisholz G.,
Quinche J. P.,
Kalo Abdel Magid
Publication year - 1964
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19640470105
Subject(s) - chemistry , cerium , lanthanum , solubility , ternary operation , rare earth , homogeneous , lanthanide , nitrate , inorganic chemistry , mineralogy , ion , thermodynamics , organic chemistry , physics , programming language , computer science
The solubility polytherms of the binary systems R(NO 3 ) 3 ‐H 2 O (R = La, Ce, Pr, Nd and Sm) have been established between 0° and 50°. The nitrate hexahydrates of lanthanum and cerium are not isotypic with the corresponding salts of the other membres of the rare earth group. This fact is responsible for the solubility anomaly already discovered by QUILL and ROBEY(Ce(NO 3 ) 3 ,6H 2 O is the most soluble salt of series) and for the miscibility gap occurring in the solid phases of the systems comprising the two types of the rare earth nitrate hexahydrates. Five ternary systems have been investigated at various temperatures, using a new technique which yields homogeneous mixed cristals.