Abstract
Abstract Glasses with composition × CoO.(0.25-x) CaO.0.75 B2O3 have been prepared over the range 0 ≤ x ≤ 0.25 containing 2 mol% of V2O5. Electron paramagnetic Resonance spectra of VO2+ of these glasses has been measured at X-band (ν ≈ 9.15 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 ≤ 0.12 the octahedral symmetry of the V4+ site is improved. A part of these glasses were annealed at 473 K for 24 hours and EPR spectra were recorded and analysed.
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