No abstract

Five kinds of M2+-V205-H20 xerogels (M=Ca, Mn, Co, Ni, Cu) have been synthesized by a simple aging of V,05 powder in aqueous solutions of MCI, below 100 "C. These xerogels had a layer structure with a spacing between 1.20 (for Cu) and 1.38 nm (for Co), larger than the V205 xerogel. The x-M2+-V20, bronzes were obtained by thermal dehydration of the corresponding xerogel at temperatures up to 450 "C. The bronzes synthesized had orthorhombic structure, similar to V,05, and each M2+ was located between the a6 planes of V,05. The dehydration behaviour and the structural change from xerogel to bronze were also studied.