Thermal decomposition of potassium permanganate and related substances. Part III. Direct evidence that K3(MnO4)2 is not an intermediate phase in the thermal decomposition of potassium permanganate in air at ca. 200 °C

Abstract

Continuous Debye–Scherrer X-ray diffraction photographs have been recorded of potassium permanganate samples over the temperature range 25–400–25 °C in air. These show that the only solid products are K₂MnO₄ and ‘K₄Mn₇O₁₆.’ thus refuting a previous conclusion that K₃(MnO₄)₂ is an intermediate phase in the thermal decomposition of KMnO₄.