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A Study of Cobalt Centers in 3 CdSO 4 · 8 H 2 O Single Crystals
Author(s) -
Prasad P. S. S.,
Radhakrishna S.
Publication year - 1991
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.2221640122
Subject(s) - octahedron , anisotropy , spectral line , crystallography , dipole , octahedral symmetry , single crystal , ion , crystal (programming language) , absorption spectroscopy , nuclear magnetic resonance , atomic physics , materials science , chemistry , physics , crystal structure , optics , programming language , computer science , organic chemistry , astronomy
The optical absorption spectra of Co 2+ in 3 CdSO 4 · 8 H 2 O single crystals are studied at ambient (300 K) and liquid nitrogen temperatures (80 K). From the nature and position of the observed bands, a successful interpretation could be made assuming octahedral symmetry for the Co 2+ ions in the crystals. The splittings observed for the 4 T 2g (F) band in Co 2+ at 80 K is explained as due to the spin—orbit interaction. The band positions are fitted with the four parameters: B = 960 cm −1 , C = 3840 cm −1 , Dq = 940, and γ = 550 at 300 K and B = 990 cm −1 , C = 3960 cm −1 , Dq = 940, and γ = 600 at 80 K. The polarized crystal spectra of Co 2+ doped 3 CdSO 4 · 8 H 2 O are recorded at 80 K and the three anisotropic bands observed near 8097, 14422, and 18692 cm −1 are presumed to be due to the spin allowed 4 T 1g (F) → 4 T 2g (F), 4 T 1g (F) → 4 A 2g (F), and 4 T 1g (F) → 4T lg (P) transitions of substitutional Co 2+ in 3CdSO 4 · 8H 2 O. The observed anisotropy indicates that the 4 T 2g (F) band is largely magnetic dipole while the other two are electric dipole in nature.