Abstract
Electron spin resonance (ESR) spectra ofx(CuO · V2O5 (1 −x) (Na2O · P2O5) andx(CuO · 2V2O5) (1 −x) (Na2O · P2O5) glasses for 0 ⩽x ⩽ 40 have been studied at the X-band and at 300 K. It is found that forx ⩽ 5, both Cu2+ and VO2+ are present, mostly as isolated species. Forx ⩾ 10, broad resonance lines atg = 2.1524 forx(CuO · V2O5) (1 −x) (Na2O · P2O5) and atg = 2.1448 forx(CuO · 2V2O5) (1 −x) (Na2O · P2O5) are observed which may be mainly due to dipole-dipole type interaction between transition metal (TM) ions. Spin Hamiltonian parameters of TM ions have been calculated. Optical spectra of the sodium phosphate glasses doped with single TM ions have also been studied. The theoretical optical basicity, Ath, of these doped glasses has been calculated. It is found that for VO2+ ionsg‖,g⊥ and κ increase whileA‖,P and Δg|/Δg⊥ decrease with increase in Ath. However, no significant change is observed in the spin Hamiltonian parameters of Cu2+ with the change in Ath.
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