Paramagnetic Resonance of Copper in Amorphous and Polycrystalline GeO2

Abstract

Articles you may be interested inCopper doping of ZnO crystals by transmutation of 64Zn to 65Cu: An electron paramagnetic resonance and gamma spectroscopy study The X-band electron paramagnetic resonance spectra of Cu+ + ions doped into amorphous, tetragonal, and hexagonal Ge02 have been observed at 295°K. Optical absorption and reflection data for, respectively, the doped glass and polycrystaIIine samples were also obtained. From the experimental results, the symmetry of the cupric complexes and some characteristics of the metal ion's bonding are deduced. In amorphous and tetragonal Ge02, the Cu+ + ions are basically in sixfold coordination. Because these cupric complexes exhibit a significant axial distortion (elongation), however, they have been treated as having square planar symmetry. Since the host cations in amorphous Ge02 are tetrahedrally coordinated, the presence of square planar Cu+ + complexes suggests that, to a significant extent, the cupric ions determine their immediate environment in the glassy host. The Cu+ + ions in hexagonal Ge02 appear to be located within the system of oxygen channels (tunnels) which are present in this crystal.1. SIEGEL AND J. A. LORENC

Vibrational, EPR and optical spectroscopy of the Cu2+ doped glasses with (90–x)TeO2–10GeO2–xWO3 (7.5 ≤ x ≤ 30) composition

“…Thus, for copper ions, according to References [33][34][35][36] the three bands corresponding to the transitions 2 B 1g → 2 A 1g , 2 B 1g → 2 B 2g and 2 B 1g → 2 E g are expected. But in the present case, we have observed a single optical absorption band which is in agreement with most of the reports [42][43][44][45]. This single optical band was interpreted as the overlap of all the three transitions.…”

The structural and spectroscopic investigations of ternary tellurite glasses, doped with copper

“…Thus, for copper ions, according to References [33][34][35][36] the three bands corresponding to the transitions 2 B 1g → 2 A 1g , 2 B 1g → 2 B 2g and 2 B 1g → 2 E g are expected. But in the present case, we have observed a single optical absorption band which is in agreement with most of the reports [33][34][35][36][37][38][39]. This single optical band was interpreted as the overlap of all the three transitions.…”

EPR and Optical Absorption Spectral Investigations of Cu2+ in Bi2O3-ZnO-B2O3-Li2O Glasses

“…A single absorption band in the near-infrared region was observed for all samples. This band in the near-infrared region can be identified as d-d transition band due to Cu 2+ ions [18] and can be described in terms of ligand field theory [19]. In glasses it is assumed that due to vitreous state disorder, no site is perfectly cubic.…”