Structural and Magnetic Properties of Hexagonal Perovskites La_1.2Sr_2.7MO_7.33 (M: Ru, Ir) Containing Peroxide Ions.

Abstract

Containing Peroxide Ions. -As revealed by powder X-ray and neutron diffraction the title compounds crystallize in the trigonal space group R3m with Z = 3. The structures contain isolated MO6 (M: Ru, Ir) octahedra, which are arranged in well-defined hexagonal perovskite slabs. These slabs are separated by [Sr2O1+δ] layers containing both O 2and ions. Compared to the Ru-compound, which shows Curie--Weiss behavior with an antiferromagnetic transition at 7 K, the magnetic susceptibility of the Ir compound is almost temperature-independent. -(GOETZFRIED*, T.; RELLER, A.; EBBINGHAUS, S. G.; Inorg.

Anionic redox processes for electrochemical devices

“…Hexagonal perovskites of general formula Ln 2 Sr 2 MO 7+ (M = Ru, Ir) that contain bulk peroxide ions are so far the only exception. [52][53][54] To broaden the spectrum of perovskite compounds hosting O-O bonding, several paths can be envisioned. The exploration of nickelate and cuprate perovskites appears as a fertile ground since these 3d-metals are known to accommodate the formation of ligand holes (high T c cuprates or La 2 NiO 4+ for instance).…”