Abstract
Optical and EPR spectra of Co(II) doped ZAPH and CAPH crystals are carried out at room and low temperatures. The results of optical absorption studies of Co(II) ion suggest near octahedral site symmetry. The crystal field ( Dq ) and inter-electronic repulsion parameters ( B and C ) are evaluated. Co(II): ZAPH: Dq = 980, B = 870 and C = 3830 cm m 1 , Co(II): CAPH: Dq = 960, B = 890 and C = 4060 cm m 1 . The results of EPR spectra reveal that the Co(II) ion exhibits slightly distorted octahedral site at 11.52 K. The spin-Hamiltonian parameters are evaluated.
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