Open AccessMonoclinic double selenates of the nickel group
Publication year - 1917
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1917.0004
Subject(s) - selenate , monoclinic crystal system , nickel , chemistry , selenium , inorganic chemistry , alkali metal , double salt , salt (chemistry) , magnesium , crystallography , group (periodic table) , zinc , molecule , ammonium , rubidium , metal , potassium , crystal structure , organic chemistry
In this paper the results are given of the investigation of the double salts potassium nickel selenate, rubidium nickel selenate, cæsium nickel selenate, and ammonium nickel selenate, each containing six molecules of water of crystallisation, forming the group of the series R2 M(SeO4 )2 , 6H2 O in which M is nickel. The results are absolutely in line with all those already published for the complete monoclinic double sulphate analogous series with 6H2 O, and for the isomorphous magnesium and zinc double selenate groups. The morphological and physical properties exhibit the progression in accordance with the atomic weight of the alkali metal which has been so clearly brought out by the previous work, and the ammonium salt is shown conclusively to belong to the isomorphous series, and to exhibit the peculiar traits described in connection with the other ammonium salts of this monoclinic series already dealt with.Symmetry .—This is the same for all the four salts, as for all the other groups of double sulphates and selenates dealt with, namely, Class 5, prismatic-holohedral, of the monoclinic system.