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  • 1 Campus Universitaire Faculté des Sciences, Département de Chimie 1060 Tunis Tunisie 1060 Tunis Tunisie
  • 2 Faculté de Pharmacie Laboratoire de Chimie Physique Minérale et Bioinorganique EA-401 5, Rue J. B. Clément 92290 Châtenay Malabry France 5, Rue J. B. Clément 92290 Châtenay Malabry France
  • 3 Université de Toulon et du Var Laboratoire de Physico-chimie du Matériau et du Milieu Marin 83957 La Garde France 83957 La Garde France
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Abstract  

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.