Zintl phases A 2 CdP 2 (A = Sr, Ba) crystallize in a noncentrosymmetric orthorhombic space group (Cmc2 1 , no. 36). There are 5 unique atomic positions, all of which are 4a Wyckoff sites (site symmetry m). The structures belong to a family of compounds, which crystallize in the well-established Yb 2 CdSb 2 structure type. This collection of compounds have been the subject of investigation in the past, including a detailed study conducted by our team on the parent compounds (Sr 2 CdP 2 and Ba 2 CdP 2 ) of the Ba-Sr-Cd-P quaternaries that we presently discuss. These parent compounds feature a layered structure comprised of CdP 4 tetrahedra, forming [CdP 2 ] 4 layers (Figure ), with Ba/Sr atoms occupying sites between the [CdP 2 ] 4 layers (interlayer site 1) and within the [CdP 2 ] 4 layers (intralayer site 2). There are an equal number of sites 1 and 2 available in the structure. Since Ba 2(1 x) Sr 2x CdP 2 are isostructural alloys with no observed changes in the layering and coordination, the reader is referred to our previous work for the overall structural description.