Table 3.

Refined fractional coordinates, site occupancy factors (sof) and isotropic thermal parameters (U_iso).

Atom	Mult/Wy	x	y	z	sof	Uiso
X-ray powder diffraction data
Ca	24d	0	$1/4$	0.1402(3)	1	0.0234(13)
Ga	16c	0.01796(12)	0.01796(12)	0.01796(12)	1	0.0231(8)
Ga	12b	$-1/8$	0	$1/4$	1	0.0239(11)
O	48e	0.1542(5)	− 0.0356(6)	0.0661(6)	1	0.029(3)
O	16c	− 0.0611(8)	− 0.0611(8)	− 0.0611(8)	1	0.038(6)
O	24d	0.4(7)	0	$1/4$	0.625(14)	0.113(13)
Time-of-flight neutron powder diffraction data
Ca	24d	0	$1/4$	0.1433(3)	1	0.017(1)
Ga	16c	0.0190(1)	0.0190(1)	0.0190(1)	1	0.0058(5)
Ga	12b	$-1/8$	0	$1/4$	1	0.0055(6)
O	48e	0.1559(2)	− 0.0288(2)	0.0633(2)	1	0.0142(5)
O	16c	− 0.0654(2)	− 0.0654(2)	− 0.0654(2)	1	0.030(1)
O	24d	0.38(2)	0	$1/4$	0.610(9)	0.046(3)