Progress in Solid State Chemistry presents a chemical view of the solid state by providing up-to-date critical reviews written by acknowledged authorities in the field. It also publishes surveys of research progress and specialized articles devoted to summarizing particular recent developments. The aim is to address the need brought about by the literature on the chemistry of the solid state being widely dispersed, making it difficult to obtain a broad and unified assessment of the present state of knowledge. Special emphasis is given to relating physical properties and structural chemistry. Whereas structural chemistry at one time was concerned mostly with perfect solids, most activity focused upon understanding of solid properties focuses on imperfections. Entities such as vacancies, dislocations, and positive holes, which have no independent existence outside the solid itself, are of prime importance in modern solid state chemistry.