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Phase equilibria up to solidus line in CuOIn 2 O 3 system have been investigated using XRD and DTA/ TG methods. According to the results, only one compound of the formula Cu 2 In 2 O 5 formed in the system studied. Its thermal stability was determined in the air and argon proving that the compound did not melt but underwent decomposition. The decomposition of Cu 2 In 2 O 5 in the air atmosphere began at 1080°C, while in argon at 835°C. Additional studies were undertaken to determine the hitherto unknown colour properties of samples representing the CuO-In 2 O 3 system in the equilibrium state.

The syntheses of two compounds Cu 2 In 3 VO 9 and CuInVO 5 , forming in the ternary system V 2 O 5 -CuOIn 2 O 3 , are described. The compound CuInVO 5 has been for the first time obtained as the pure phase. The temperatures and modes of melting of the compounds are determined, and their IR spectra are analysed. The phase diagram of V 2 O 5 -CuO-In 2 O 3 system in subsolidus area is constructed by DTA and XRD methods. This system is shown to consist of 11 subsidiary subsystems in which three solid phases coexist at equilibrium. The melting temperatures of these subsystems are also determined.Keywords Cu 2 In 3 VO 9 Á CuInVO 5 Á Phase diagram Á System V 2 O 5 -CuO-In 2 O 3 Á DTA Á XRD Á IR

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Thermal stability of a compound forming in a binary system MoO 3 -In 2 O 3 was investigated by DTA/TG, XRD and SEM methods in this study. For the first time, the diagram of phase equilibria established in the whole range of concentrations of this system's components has been constructed. The temperature and concentration ranges of the components of MoO 3 -In 2 O 3 system in which the compound In 2 (MoO 4 ) 3 co-exists in solid state with MoO 3 or In 2 O 3 or with the liquid were determined. The composition and melting point of the eutectic mixture consisting of In 2 (MoO 4 ) 3 and MoO 3 were found.