Philosophical Magazine B · 1997 · 24 citations · 13 references
Optical MaterialsX-ray SpectroscopyEngineeringMagnetic ResonanceGlass MaterialChemistryGlass-ceramicOptical PropertiesElectron Paramagnetic ResonanceQuantum MaterialsComposition X CooVanadyl IonMaterials SciencePhysicsCrystallographyVo2+ IonsNatural SciencesX-ray DiffractionApplied PhysicsCondensed Matter Physics
Abstract Glasses with the composition x Coo.(1−x)(ZnO.2B2O3) have been prepared in the CoO concentration range 0 ≤ x ≤ 0·24 containing 2 mol% V2O5. Electron paramagnetic resonance (EPR) spectra of V02+ of these glasses have been measured at the X-band frequency v ≈ 9·14 GHz, at room temperature and at liquid-nitrogen temperature. Spin-Hamiltonian parameters of the VO2+ ions have been calculated. It is found that for x ≤ 0·15 the octahedral symmetry of the V4+ site is improved. Parts of these glasses were annealed at 373 and 573 K for 2h and EPR spectra were recorded and analysed. Theoretical optical basicity values of the samples were calculated and it was found that the predictions made by these calculated values are in agreement with the experimental findings.
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