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Al 3+ Ion Site Symmetry in (NH 4 ) 2 [AlF 5 · H 2 O] Single Crystals
Author(s) -
Darabont Al.,
Borodi Gh.,
Nistor S. V.,
VelterStefănescu M.
Publication year - 1995
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.2221890214
Subject(s) - ion , electron paramagnetic resonance , symmetry (geometry) , chemistry , crystallography , single crystal , infrared , nuclear magnetic resonance , physics , optics , geometry , mathematics , organic chemistry
The production of pure and Cr 3+ doped (NH 4 ) 2 [AlF 5 · H 2 O] single crystals and the crystal structure of this compound are described. The infrared spectra recorded experimentally at room temperature show – using the results of group theory – that the [AlF 5 · H 2 O] 2− complex ion has at most the symmetry of the C 4v group. EPR measurements are carried out for a more exact determination of the site symmetry of Al 3+ ions using the Cr 3+ ion on Al 3+ site as “probe ion”. The determined values of spin‐Hamiltonian parameters suggest that the symmetry of the [AlF 5 · H 2 O] 2− complex ion has at most the symmetry of the C 2v group.