“…and X ¼ Cl, Br, I), are built as face-shared, corner-shared, edge-shared or partly face-partly corner-shared form of [MX 6 ] 4À -octahedrons [1,2]. RbCdBr 3 belongs to the edge-shared type [3][4][5], CsCdBr 3 belongs to the faceshared type [2], and CsCdCl 3 , CsMnCl 3 belong to the partly face partly corner-shared type with different crystal symmetry [6,7].…”