On phase transitions in chloride perovskite layer structures

Abstract
Phase transitions in two types of chloride perovskite layer compounds with the formulae (C n H2n+1 NH3)2MCl4 with n = 1 … 10 and {NH3 - (CH2) n - NH3} MCL4 with n = 2 … 5 and M = Mn, Cu and Cd are discussed.