Authors:E. Aragon, K. Jardet, P. Satre and A. Sebaoun
The first part of this paper presented five experimental isopletic cuts in the Al-Zn-Ga ternary phase diagram. On these cuts,
two isobaric ternary invariant reactions were determined and a significant retrograde miscibility of Ga in a α′SS solid solution was observed.
In the second part, the two isobaric invariant reactions are studied more precisely. In particular, the composition of the
invariant phases are given and the Ga miscibility in the αSS ternary solid solution is studied. Isothermal sections are established. The results confirm the existence of a vanishing
point in the liquidus area, conjugated with a ternary critical point at about 290C. A general perspective shape of the equilibria
in the diagram is proposed.
Authors:M. Mansori, C. Favotto, K. Jardet, M. Roubin, A. Sebaoun and P. Satre
The oxygen exchange between the condensed phase(s) and the gas phase was studied as a function of temperature for superconducting
phases of the system (Bi,Pb)-Sr-Ca-Cu-O.
An oxygen probe apparatus allowed confirmation that the variation in oxygen composition in the Pb2212 and Pb2223 superconducting
phases is a reversible phenomenon on heating and cooling. It was demonstrated that the mass loss of both phases, for the 905
and 980°C isotherms, was due to the oxygen composition variation and to PbO loss (this latter phenomenon begin irreversible).
Authors:M. Hichri, C. Favotto, H. Zamali, Y. Feutelais, B. Legendre, A. Sebaoun and M. Jemal
Phase diagram of the binary system AgNO3—RbNO3 was studied using thermal analysis technique, differential scanning calorimetry and X-ray diffraction. This binary exhibits a congruently melting compound Ag0.5Rb0.5NO3 (m. p.=138°C), an incongruently melting one Ag0.33Rb0.66NO3 with two polymorphic varieties, two eutectics at (36 mol% RbNO3, 128°C) and at (60 mol% RbNO3, near 134°C) respectively and a peritectic at (60.5 mol% RbNO3, 141°C). This system contains also three invariant reactions at 164, 222 and 282°C due to the phase transitions of RbNO3 and another one at
164°C due to the phase transition of AgNO3.