Kinetic studies of the solid-state decomposition of manganese(II) formate dihydrate. Part I. Microscopic and isothermal gravimetric measurements on single crystals

Abstract

Reliable energetic parameters for the anisotropic dehydration of manganese(II) formate dihydrate may be obtained using two distinct experimental procedures. Direct microscopic measurements of interface advancement at {011} faces yields, for the enthalpy of activation, a value of 18·6 ± 1·8 kcal mol^–1, whereas microgravimetry leads, indirectly, to a value of 17·1 ± 1·5 kcal mol^–1. The entropy change accompanying activation is insignificantly small.