Contributionàl'étude du système formépar l'étain,le soufre et l'iode. Mise enévidence des deux variétés de l'iodosulfure stanneux Sn2SI2: Comportement thermique etétude structurale

We have found a new compound Mn₈O₁₀Cl₃. It is prepared by oxidation of anhydrous or hydrated MnCl₂ in streaming (N₂ + O₂) at temperatures less than 680°C. At room temperature the compound is tetragonal, a = b = 9.2898 Å, c = 13.0247 Å. The more symmetric space group is $\text{I4}\text{mmm}$. Mn₈O₁₀Cl₃ becomes cubic at 360°C with the c-axis as cubic parameter. In air, DTA and GTA have shown that Mn₈O₁₀Cl₃ is transformed at 580°C into Mn₂O₃ which gives Mn₃O₄ at 960°C. The exact formula has been determined only by crystal structure analysis.