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The optical spectra of rare‐earth cobalticyanides
Author(s) -
Bonnet M. C.,
AnticFidancev E.,
Porcher P.,
LemaitreBlaise M.,
Caro P.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220850222
Subject(s) - chemistry , orthorhombic crystal system , lanthanide , crystallography , lanthanum , lanthanide contraction , lutetium , absorption spectroscopy , rare earth , crystal structure , mineralogy , physics , inorganic chemistry , yttrium , ion , optics , organic chemistry , oxide
Rare earth cobalticyanides Ln[Co(CN) 6 ] · n H 2 O have two cristalline forms, an hexagonal one from La to Nd with n = 5 and an orthorhombic one from Ce to Lu with n = 4. The optical absorption spectra of the Nd 3+ (4f 3 ) and the fluorescence spectra of the Eu 3+ (4f 6 ) in the pure and doped salts are recorded at low temperatures (4.2 or 77 K) in the polycristalline form. The orthorhombic phase exhibits spectra corresponding to a lanthanide in a C 2v site under a weak crystal field (B q 2 , B q 4 < 500 cm −1 ). The spectra for Nd 3+ and Eu 3+ in the hexagonal lanthanum compounds are compatible with a C 3h site symmetry. There is evidence of selection rules for the dipole electric transitions in 4f 3 , and the 4f 6 configuration has levels which are Kramers doublets.