Table 2.

Ion positions of the orthorhombic β′-Ta₂O₅ structure with lattice parameters for two formula units in the c direction of a = 6.425 Å, b = 3.769 Å and c = 7.706 Å.

Ion	x	y	z	Occupancy
Ta1	0.00	0.00	0.00	1
Ta2	0.45	0.41	0.00	1
Ta3	0.00	0.91	0.50	1
Ta4	0.45	0.50	0.50	1
O1	0.98	0.95	0.25	1
O2	0.46	0.45	0.25	1
O3	0.11	0.47	0.00	1
O4	0.34	0.94	0.00	1
O5a	0.72	0.20	0.00	1
O6	0.98	0.95	0.75	1
O7	0.47	0.45	0.75	1
O8	0.11	0.44	0.50	1
O9	0.34	0.97	0.50	1
O5b	0.72	0.70	0.50	1