Transition-Metal Perovskites

Perovskites are one of the most important classes of inorganic materials, thanks to a variety of their functional properties and inherent chemical and structural flexibilities. This chapter provides a brief review on crystal chemistry and crystallography of perovskites with emphasis on the achievements made within the last 10–15 years. The topics covered include cooperative octahedral tilting distortions in perovskites, lone-pair-driven and electronic instabilities, ordering phenomena at cation and anion sublattices, and aperiodic order in perovskites and mixed-anion perovskites

Crystal chemistry and selected physical properties of inorganic fluorides and oxide-fluorides

importance in the development of many new technologies, andare impacting various key points of modern life, that is, energyproduction and storage, microelectronics and photonics,catalysis, automotive, building, etc. Many research fields andapplications are indeed concerned by a better knowledge of therelationships occurring between the structure of suchcompounds and some pertinent physical properties. ThisReview deals with the structural chemistry of solid-stateinorganic fluorides and oxide-fluorides, mostly transitionmetal-based, including rare-earth elements. Such a Review hasnot been published for a long time.1 Articles that recentlyappeared on inorganic fluorinated compounds were mostlyfocused on material science characteristics: morphology, surfacefunctionalization, nanostructuration of the materials andapplications, rather than on the description of characteristicstructural features.2−5 Detailed reviews focused on rare earthbasedinorganic fluorides have also appeared some yearsago..