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Influence of Host Lattice in Interstital Dopant Sites: EPR Studies on Cu (II) Doped Sarcosine Cadmium Bromide Single Crystals
Author(s) -
Pathinettam Padiyan D.,
Muthukrishnan C.,
Murugesan R.
Publication year - 2000
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200005)35:5<595::aid-crat595>3.0.co;2-e
Subject(s) - sarcosine , dopant , doping , electron paramagnetic resonance , cadmium , lattice (music) , crystallography , chemistry , materials science , inorganic chemistry , nuclear magnetic resonance , optoelectronics , physics , organic chemistry , acoustics , glycine , biochemistry , amino acid
EPR study of Cu(II) doped in sarcosine cadmium bromide single crystals are carried out at room temperature. The impurity ions occupy the interstitial position in this crystal lattice. Crystalline field around the Cu(II) ion in this low symmetry crystal is rhombic. The transitions arise from a single paramagnetic site with g xx = 2.1082, g yy = 2.0005, g zz = 2.2071, and A xx = ‐64 x 10 ‐4 cm ‐1 , A yy = ‐23 x 10 ‐4 cm ‐1 , A zz =‐185 x 10 ‐4 cm ‐1 . The ground state is an admixture of dx2‐y2 and dz2 states. The observed molecular orbital coefficient value a2 = 0.85 reveals a moderate covalency of the s bonding and b2 = 0.967 indicates the weak pi bonding. A strong interaction between Cu(II) and nitrogen ligands is found to exist.