V4+ in quenched calcium silicates: An electron spin resonance spectroscopic investigation
Source abstract
Abstract
Electron spin resonance (ESR) studies of vanadium(IV) have been carried out on CaO-SiO2, CaO-MgO-SiO2 and CaO-Al2O3-SiO2 slags equilibrated with oxygen partial pressures over the range 10−9–10−2 atm and also CaO-SiO2-V2O5-Fe2O3 slag melted in air. The slags were melted at 1873 K and their V2O5 level was varied between 1 and 10 mol%. Three different melt basicities and alumina contents were investigated. Magnesia content was varied between 3.5 and 4.9 wt%. An industrial slag sample was also examined. The spin Hamiltonian parameters were determined and it was concluded that the paramagnetic vanadium was in the form of a distorted octahedral vanadyl complex (VO2+). An overlapping signal from a yet unknown paramagnetic vanadium species was present in all slags. In general this signal diminished with reduction in the oxygen pressures below 10−6 atm and V2O5 content. It also decreased with increase in basicity and magnesia content. The critical fraction of paramagnetic vanadium for induction of the second species was dependent on melt composition.
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Research context
OpenAlex topics: Metallurgical Processes and Thermodynamics · Metal Extraction and Bioleaching · Glass properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (21)
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