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- W2060822025 abstract "Spectra of electron paramagnetic resonance (EPR) of sol–gel derived silica glass doped with vanadium (1 wt%) were measured at ∼9 GHz and ∼300 K after various stages of the process (sol → fresh gel → aged gel → heat treated gel → glass). We show that the source of electron paramagnetic resonance spectra of the doped solution of aqua-complexes of vanadyl resides in the gel pores after heat treatment at temperatures Tt⩽973 K. The number of vanadyl ions in a sample decreases with increasing Tt and the remainder is immobilized on the pore surface in local environments in which the spectra of vanadium species becomes undetectable. In the temperature range in which the pores collapse a symmetrically shaped single component with observed g ∼ 1.96 is attributed to V4+ clusters. After a treatment at Tt⩾1023 K the width of this line increases at sample temperatures above 340 K. We assumed that this line is due to the formation of crystalline inclusions of non-stoichiometric VO2 for which insulator–metal transition is commonly observed at ∼340 K. The volume of crystalline phase VO2 is less than the detection limit of X-ray diffraction technique used in the present work. For the samples heat treated at Tt>1073 K the spectrum with hyperfine structure (HFS) attributed to isolated V4+ ions in tetrahedral coordination appears at 77 K. The parameters of spin Hamiltonian of orthorhombic symmetry indicate that the wave function of ground state of V4+ is the |3z2−r2〉 type. The absorption bands with maxima at ∼770 and ∼930 nm are observed in optical spectra of these samples." @default.
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- W2060822025 date "1998-11-01" @default.
- W2060822025 modified "2023-10-16" @default.
- W2060822025 title "EPR study of vanadium-containing amorphous silica formed by sol–gel method" @default.
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- W2060822025 doi "https://doi.org/10.1016/s0022-3093(98)00745-5" @default.
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