Ba2Sr(PO4)2 crystallizes in the trigonal R-3m space group. Ba(1) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. Sr(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. P(1) is bonded in a tetrahedral geometry to one O(2) and three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Ba(1), one Sr(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ba(1) and one P(1) atom.
Ba2Sr(PO4)2 crystallizes in the trigonal R-3m space group. Ba(1) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. The Ba(1)-O(2) bond length is 2.58 Å. There are six shorter (2.88 Å) and three longer (2.97 Å) Ba(1)-O(1) bond lengths. Sr(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. All Sr(1)-O(1) bond lengths are 2.68 Å. P(1) is bonded in a tetrahedral geometry to one O(2) and three equivalent O(1) atoms. The P(1)-O(2) bond length is 1.54 Å. All P(1)-O(1) bond lengths are 1.57 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Ba(1), one Sr(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ba(1) and one P(1) atom.