Abstract
The phase equilibria in the solid state in the system FeVO4–Cu3V2O8 and FeVO4–CuO have been determined. Based on the obtained DTA and XRD analysis results and some additional research, a phase diagram in the whole subsolidus area of the system CuO–V2O5–Fe2O3 has been worked out. Eighteen subsidiary subsystems can be distinguished in this ternary system. Basic properties of the obtained phases with howardevansite- and lyonsite-type structure have been investigated by DTA, IR, and SEM methods.
Highlights
It is known that the components of the ternary systems MO–V2O5–Fe2O3 as well as the compounds existing in their lateral systems catalyze a lot of chemical reactions [1,2,3]
It can be expected that new phases forming with an involvement of all components of such systems will be active in catalytic processes, too
Compounds forming in the lateral systems of the ternary system CuO–V2O5–Fe2O3 as well as their properties are known [4,5,6]
Summary
It is known that the components of the ternary systems MO–V2O5–Fe2O3 as well as the compounds existing in their lateral systems catalyze a lot of chemical reactions [1,2,3]. It can be expected that new phases forming with an involvement of all components of such systems will be active in catalytic processes, too Searching for these new potential catalysts is very often conducted through the investigation of phase relations in subsolidus areas of the multicomponent oxide systems. As a result of the research on phase relations in the limited concentration range of the components of this ternary system, unknown till compound with the formula Cu13Fe4V10O44 has been obtained [7]. This compound crystallizes in the monoclinic system and melts incongruently at 790 ± 5 °C [7]. Both phases have ranges of homogeneity as expressed by Cu3?1.5xFe4-xV6O24 (-0.333 B x B -0.167 for howardevansite-type phase and 0.667 B x \ 0.778 for lyonsite-type phase) [13]
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