Study of a Structural Description of the Endothermic Decompositions Solid 1 yields Solid 2 plus Gas. IV.

Article abstract of DOI:10.1016/0022-4596(83)90078-6

The X-ray analysis of BaC//2O//4,2H//2O crystals partially transformed into BaC//2O//4,H//2O leads to the specific reticular orientation relationships of the dehydration BaC//2O//4,2H//2O goes to BaC//2O//4,H//2O plus H//2O. Their interpretation has been made by a plane-by-plane comparison of the dihydrate crystal structure with the monohydrate. The principal features of the ionic movements are described; they differ from those which are expected from a simple topological comparison of the structures. With the assumption of a displacive transformation, coherent or semicoherent interfaces seem to be built up from all invariant plane families, as deduced from the X-ray analysis.