Spectral studies of divalent copper in antlerite mineral

摘要

Electron paramagnetic resonance (EPR) spectra on antlerite mineral are recorded both at RT & LNT. Optical asorption spectra are recorded from 200-2500 nm at RT. The chemical analysis of antlerite reveals that the concentration of CuO in the mineral is 11.94 wt%. Optical absorption spectrum of antlerite shows four bands, which are mainly due to Cu(II). EPR and optical results of the antlerite sample confirmed that Cu(II) is in rhombically distorted (D{sub}2h) octahedral symmetry. Spin-Hamiltonian parameters are evaluated as g{sub}1 = 2.36, g{sub}2=2.16 and g{sub}3=2.07,A{sub}1 =160×10{sup}-4 cm{sup}(-1), A{sub}2=40×10{sup}-4 cm{sup}(-1) and A{sub}3=60×10{sup}-4 cm{sup}(-1). The NIR spectra of antlerite are attributed to water fundamentals.