Thermoanalytical characterization of vanadium-chromium oxide compounds prepared by 'soft chemistry' method |
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| Authors: | O Pozdnyakova J Megyeri E Kuzmann L Szirtes |
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| Institution: | 1.Institute of Isotopes, Chemical Research Center of the Hungarian Academy of Sciences;2.Institute of Isotopes, Chemical Research Center of the Hungarian Academy of Sciences;3.Department of Nuclear Chemistry, Research Group of Nuclear Methods in Structural Chemistry HAS, E?tv?s Lorand University;4.Institute of Isotopes, Chemical Research Center of the Hungarian Academy of Sciences |
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| Abstract: | Summary Hydrated microcrystalline compound, V1-xCrxOy·nH2O, where x<0.063 and 4.4<n<8 and hydrated amorphous phases, CrVO4·H2O and Cr2V4O13·4H2O have been prepared using peroxo-polyacids of vanadium and chromium. The transformations of these hydrated phases upon heating
were studied by TG-DTA and XRD techniques and led to three crystalline anhydrous compounds: (i) phase V1-xCrxOy, which is closely related to the orthorhombic V2O5, (ii) Cr2V4O13 and (iii) monoclinic CrVO4-M. The ranges of coexistence of phases in equilibrium were also determined. |
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| Keywords: | vanadium chromium thermal analysis sol-gel |
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