Table 2. A Site Coordination Numbers, Bond Distances, and Bond Valence Sums in A₃YGa₂O_7.5 Phases.

			Ba–O			Sr–O			Ba to Sr
	site	CN (Ba/Sr)	average (Å)	variance (Å2)	BVS	average (Å)	variance (Å2)	BVS	no. of longer bonds
all A–O	Ba1/Sr3	10/10	3.012	0.130	1.91	2.896	0.173	1.93	3
	Ba2/Sr4	8/8	2.858	0.011	1.76	2.722	0.033	1.73	0
	Ba3/Sr2	11/11	3.050	0.089	1.72	2.987	0.177	1.57	4
	Ba4/Sr1	10/10	2.961	0.038	1.87	2.891	0.121	1.75	2
97.5% BVS	Ba1/Sr3	8/8	2.855	0.027	1.86	2.744	0.091	1.89	3
	Ba2/Sr4	8/8	2.858	0.011	1.76	2.722	0.033	1.73	0
	Ba3/Sr2	9/9	2.925	0.012	1.66	2.818	0.043	1.54	1
	Ba4/Sr1a	10/9	2.961	0.038	1.87	2.812	0.121	1.73	2

^aFor Sr1, the standard deviation is calculated over the 10 bond distances equivalent to that of Ba4. The final column gives the number of bond lengths that are longer for A = Sr.