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  • Author or Editor: Grażyna Dąbrowska x
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Abstract  

The behaviour of Al2(MoO4)3 towards AIVO4 in the subsolidus area, over the whole component concentration range, has been studied using the DTA and XRD methods. The experimental results have been presented in the form of a phase diagram. It has been found that components of the system of interest do not remain in equilibrium, and AlVO4−Al2(MoO4)3 system is not a real two-component system, even in the subsolidus area.

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Abstract  

The phase equilibria in the solid state in the system AlVO4−MoO3 were determined by DTA and XRD methods. The experimental results are presented in the form of a phase diagram. In the subsolidus area, the system AlVO4−MoO3 is a real two-component system only within the range AlVO4−AlVMoO7.

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Abstract  

In this work it has been established which compounds finally are formed in air in the two-component CuO-V2O5 and CuO-α-Sb2O4 systems. Unknown thermal properties of CuV2O6, Cu2V2O7 and Cu11V6O26 have been established. Reactivity of the oxides and phase relations in the ternary V2O5-CuO-α-Sb2O4 system in air have been studied by using XRD and DTA methods. The results have showed the reaction of V2O5, CuO with α-Sb2O4 does not produce any compound where all the three oxides would be involved. It has been established that the α-Sb2O4 reacts and forms binary phases independently with CuO or V2O5. On the base of these results the investigated system was divided into subsidiary subsystem in which CuSb2O6 remains at equilibrium in the solid state with other phases formed in corresponding binary systems.

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Unknown thermal properties of ZnSb2O6 and Zn7Sb2O12 compounds

Reactivity of α-Sb2O4 with ZnO on heating in air

Journal of Thermal Analysis and Calorimetry
Authors: Elżbieta Filipek and Grażyna Dąbrowska

Abstract  

The investigations by XRD, DTA/TG and IR methods show that two compounds: ZnSb2O6 and Zn7Sb2O12 are formed in the ZnO-α-Sb2O4 system in air. Oxygen contained in the air participates in the synthesis of these compounds. ZnSb2O6 was observed as an intermediate phase, during the Zn7Sb2O12 synthesis. The temperature of the β→α-Zn7Sb2O12 transition was fixed at 1225±10°C. The mechanisms of the reactions of ZnSb2O6 and Zn7Sb2O12 thermal decomposition have been proposed. The IR studies of α and β-Zn7Sb2O12 have initially indicated that the structures of both polymorphous forms differ in the reciprocal connection of the SbO6 and ZnO6 octahedra and the ZnO4 tetrahedra.

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