Authors:V. Vassilev, V. Parvanova, and L. Aljihmani
The phase diagram of the system CdI2-Bi2O3 is studied by means of X-ray diffraction, differential thermal analysis and measurements of the density of the material.
As a result of the synthetic and peritectic interactions, two incongruently melting intermediate phases i.e. phase A - CdI22Bi2O3 and phase B - CdI24Bi2O3 (stable in the temperature interval 370-850C) are formed. The phase A exists in two polymorphic forms with a temperature
of the phase transition Ta↔b=320-370C. The unit cell parameters at low temperature modification of a-CdI22Bi2O3 were determined. (a=1.032 nm, b=1.046 nm, c=1.046 nm, α=115.02, β=109.11 and γ=82.04). The phases A and B have fields of homogeneity.
In the ternary system PbO−P2O5−PbCl2, the partial ternary system Pb5Cl2O4−Pb3Cl2O2−Pb10(PO4)6Cl2 was examined by thermal, microscopic, X-ray, dilatometric and IR absorption analyses and its phase diagram was provided.
Phase dependences in the binary system lead fluoride [PbF2]—cadmium fluoride [CdF2] were examined and the phase diagram of this system was established. The occurrence of solid continuous solutions with a
minimum melting point of 750C and a CdF2content of 35 mol% was confirmed. Thermal, dilatometric, microscopic and X-ray analytical methods were used during the investigations.
Phase dependencies in the ternary system Pb3Cl2O2−PbCl2−Pb10(PO4)6Cl2, which is a partial system of the ternary system PbO−P2O5−PbCl2, have been investigated by thermal, X-ray phase, microscopic, dilatometric and IR absorption analyses. The phase diagram
of the Pb3Cl2O2−PbCl2−Pb10(PO4)6Cl2 system has been provided. The components have been found not to form any new chemical compounds.
Reactivity of FeVO4 towards Ni2V2O7 and Ni3V2O8 in the solid state was investigated. On the base of XRD and DTA results, phase diagrams in subsolidus area of the FeVO4-Ni2V2O7 and FeVO4-Ni3V2O8 intersections of the ternary system NiO-V2O5-Fe2O3 have been worked out and the phase diagram of this ternary system in subsolidus area in the whole component concentration
range has been verified.
Authors:Jadwiga Walczak and Izabella Rychłowska-Himmel
Phase equlibria in the solid state in the system Fe2WO6−Fe8V10W16O85 were studied by means of X-ray phase powder diffraction and differential thermal analysis, This system is one of the intersections
of the three-component system Fe2O3−V2O5−WO3. The investigation demonstrated that the system is not a real two-component system even below the solidus line.
DTA and XRD methods were applied in studies on phase equilibria established in the system V9Mo6O40-AlVMoO7 up to 1000C over the whole component concentration range. The results were presented in the form of a phase diagram.
Differential thermal analysis (DTA) and X-ray powder diffraction (XRD) were used to study phase equilibria, established in
air in the V2O5-Sb2O4 system up to 1000C. It has been found that there is a new phase =SbVO5. The =SbVO5 has been prepared by two methods: by heating equimolar mixtures of V2O5 and α-Sb2O4 in air and by oxidation of the known phase of rutile type obtained in pure argon at temperatures between 550 and 650C. Thermal
decomposition of =SbVO5 in the solid state starts at 710C giving off oxygen. The results provide a basis for constructing only a part of the phase
diagram of the investigated system (up to 50.00 mol% Sb2O4).