Halide Perovskite-Type Layer Structures
(auth.), H.P.J. Wijn (eds.)The magnetic properties of halides have been compiled in subvolume 27J. The third part, 27J3, contains data on structural and magnetic properties of halide perovskite-type layer structures of the types A2MX4 (monolayer compounds), A3M2X7 (double-layer) and A4M3X10 (triple-layer) where X=F-, Cl-, etc.; M=Mg2+, Cr2+, Mn2+, Zn2+, Cd2+, etc.; and A=K+, Rb+, Cs+, etc. In addition, for X=Cl- and Br- data are presented on compounds where the alkali ions are replaced by n-alkylammonium chains, and also for diammonium compounds where two alkali ions are replaced by divalent alkylene-diammonium ions. A brief sketch of the theory of phase transitions and of the relevant models (2D Ising model, 2D XY-model, 2D Ising spin glass) is also given as well as a comprehensive selection of data on critical properties near the phase transitions.