CURIE TEMPERATURES OF A(M-1)BI(2)M(M)O(3M+3) LAYERED FERROELECTRICS

The Curie temperatures of 53 A(m-1)Bi(2)M(m)O(3m+3) layered perovskite -like ferroelectrics are examined in relation to the structure and com position of these compounds. In general, no correlation can be reveale d between T-C and Goldschmidt's tolerance factor t. However, these com pounds can be divided into groups, each characterized by its own T-C(t ) dependence. It seems likely that the T-C of the ferroelectrics consi dered here is controlled by the chemistry of the perovskite layer.