A new orthoborate, Sr₃Ga₃(BO₃)₄O(OH)

The crystal structure of tristrontium trigallium tetraborate oxide hydro­xide has been determined by X-ray diffraction using a crystal grown by hydro­thermal crystallization of a strontium gallo-borate glass. It represents a new orthoborate structure type built of complex layers formed by BO₃ triangles sharing corners with Ga₂O₇ tetrahedral dimers and GaO₄OH square pyramids. The Sr atoms occupy both inter- and intralayer sites.

Computing details

Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1996); data reduction: SAINT; program(s) used to solve structure: SHELXS86 (Sheldrick, 1990); program(s) used to refine structure: SHELXL93 (Sheldrick, 1993); molecular graphics: XTALDRAW (Bartelmehs & Downs, 1997); software used to prepare material for publication: SHELXL93.

(I)

Crystal data

Sr3Ga3(BO3)4O(OH)	F(000) = 680
Mr = 740.27	Dx = 4.198 Mg m^−3
Monoclinic, P21/m	Mo Kα radiation, λ = 0.71073 Å
a = 4.9084 (2) Å	Cell parameters from 15160 reflections
b = 13.6795 (7) Å	θ = 2.3–36.4°
c = 9.0482 (4) Å	µ = 20.45 mm^−1
β = 105.414 (1)°	T = 299 K
V = 585.68 (5) Å^3	Prism, colourless
Z = 2	0.09 × 0.08 × 0.05 mm

Data collection

Siemens SMART 1K CCD area detector + Siemens P4 diffractometer	2838 independent reflections
Radiation source: rotating anode	2232 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.050
Detector resolution: 819.2 pixels mm^-1	θmax = 36.4°, θmin = 2.3°
area detector scans	h = −8→8
Absorption correction: multi-scan (Sheldrick, 1996)	k = −18→22
Tmin = 0.161, Tmax = 0.360	l = −15→14
15160 measured reflections

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.035	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.074	Only H-atom coordinates refined
S = 1.06	w = 1/[σ^2(Fo^2) + (0.0425P)^2] where P = (Fo^2 + 2Fc^2)/3
2835 reflections	(Δ/σ)max = 0.040
117 parameters	Δρmax = 1.00 e Å^−3
0 restraints	Δρmin = −1.85 e Å^−3

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq	Occ. (<1)
Sr1	0.38534 (6)	0.44853 (2)	0.29571 (3)	0.01081 (7)
Sr2	0.52609 (10)	0.2500	0.62463 (5)	0.01287 (9)
Ga1	−0.07776 (11)	0.2500	0.30908 (5)	0.00971 (10)
Ga2	0.16202 (8)	0.37189 (2)	−0.13029 (4)	0.01025 (8)
B1	0.0043 (8)	0.3974 (2)	0.5646 (4)	0.0096 (6)
B2	−0.2546 (8)	0.3787 (3)	0.0336 (4)	0.0119 (6)
H	−0.515 (16)	0.235 (7)	0.225 (9)	0.020*	0.50
O1	0.1115 (5)	0.3469 (2)	0.4602 (3)	0.0119 (4)
O2	0.2001 (5)	0.4363 (2)	0.6957 (3)	0.0142 (4)
O3	0.4647 (5)	0.3850 (2)	0.0366 (3)	0.0152 (4)
O4	−0.4615 (7)	0.2500	0.3096 (4)	0.0130 (6)
O5	−0.1825 (6)	0.4056 (2)	−0.0994 (3)	0.0195 (5)
O6	−0.0533 (5)	0.3488 (2)	0.1587 (3)	0.0153 (4)
O7	0.1280 (10)	0.2500	−0.2127 (4)	0.0219 (8)
O8	−0.2757 (5)	0.4077 (2)	0.5506 (3)	0.0128 (4)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Sr1	0.01031 (13)	0.01163 (12)	0.01008 (12)	−0.00155 (10)	0.00199 (10)	−0.00006 (9)
Sr2	0.0099 (2)	0.0127 (2)	0.0154 (2)	0.000	0.00224 (15)	0.000
Ga1	0.0080 (2)	0.0110 (2)	0.0098 (2)	0.000	0.0019 (2)	0.000
Ga2	0.0089 (2)	0.01202 (14)	0.00963 (15)	−0.00001 (12)	0.00206 (12)	0.00019 (11)
B1	0.0093 (14)	0.0108 (12)	0.0080 (13)	0.0006 (11)	0.0013 (11)	0.0013 (11)
B2	0.013 (2)	0.0118 (13)	0.0108 (14)	0.0009 (12)	0.0036 (12)	0.0000 (11)
O1	0.0107 (11)	0.0127 (9)	0.0131 (10)	0.0011 (8)	0.0048 (8)	−0.0015 (8)
O2	0.0140 (11)	0.0182 (10)	0.0102 (10)	−0.0062 (9)	0.0032 (8)	−0.0006 (8)
O3	0.0092 (11)	0.0255 (11)	0.0105 (10)	0.0013 (9)	0.0019 (8)	0.0002 (9)
O4	0.0074 (15)	0.0177 (14)	0.0131 (15)	0.000	0.0015 (12)	0.000
O5	0.0138 (12)	0.0332 (14)	0.0136 (11)	0.0078 (11)	0.0071 (9)	0.0113 (10)
O6	0.0110 (11)	0.0202 (10)	0.0132 (10)	−0.0029 (9)	0.0003 (9)	0.0059 (9)
O7	0.035 (2)	0.0132 (14)	0.017 (2)	0.000	0.007 (2)	0.000
O8	0.0082 (10)	0.0174 (10)	0.0125 (10)	0.0024 (8)	0.0020 (8)	0.0010 (8)

Geometric parameters (Å, º)

Sr1—O8^i	2.522 (2)	Ga2—O7	1.816 (2)
Sr1—O8^ii	2.547 (2)	Ga2—O3	1.824 (2)
Sr1—O2^iii	2.559 (2)	Ga2—O5	1.844 (3)
Sr1—O6	2.572 (3)	Ga2—O2^xi	1.856 (2)
Sr1—O3	2.625 (2)	Ga2—Sr2^xi	3.6052 (5)
Sr1—O1	2.649 (2)	Ga2—Sr1^iv	3.6546 (5)
Sr1—O5^iv	2.681 (2)	Ga2—Sr2^xii	3.7096 (6)
Sr1—O4^i	2.8118 (10)	Ga2—Sr1^xiii	3.8703 (5)
Sr1—O2^ii	3.296 (3)	B1—O8	1.354 (4)
Sr1—B1^ii	3.314 (3)	B1—O1	1.383 (4)
Sr1—B1^i	3.422 (3)	B1—O2	1.417 (4)
Sr1—B2^i	3.448 (4)	B1—Sr2^x	3.248 (3)
Sr2—O8^i	2.529 (2)	B1—Sr1^ii	3.314 (3)
Sr2—O8^v	2.529 (2)	B1—Sr1^x	3.422 (3)
Sr2—O1^vi	2.550 (2)	B2—O6	1.353 (4)
Sr2—O1	2.550 (2)	B2—O3^x	1.388 (4)
Sr2—O7^vii	2.741 (4)	B2—O5	1.391 (4)
Sr2—O4^i	2.868 (4)	B2—Sr1^x	3.448 (4)
Sr2—O7^viii	2.930 (5)	O2—Ga2^vii	1.856 (2)
Sr2—O2^vi	3.165 (3)	O2—Sr1^iii	2.559 (2)
Sr2—O2	3.165 (3)	O2—Sr1^ii	3.296 (3)
Sr2—B1^vi	3.191 (3)	O3—B2^i	1.388 (4)
Sr2—B1	3.191 (3)	O4—Sr1^ix	2.8118 (10)
Sr2—B1^i	3.248 (3)	O4—Sr1^x	2.8118 (10)
Ga1—O4	1.885 (4)	O4—Sr2^x	2.868 (4)
Ga1—O6^vi	1.944 (2)	O5—Sr1^iv	2.681 (2)
Ga1—O6	1.944 (2)	O5—Sr2^xii	3.303 (3)
Ga1—O1	1.953 (2)	O7—Ga2^vi	1.816 (2)
Ga1—O1^vi	1.953 (2)	O7—Sr2^xi	2.741 (4)
Ga1—Sr1^vi	3.5642 (4)	O7—Sr2^xii	2.930 (5)
Ga1—Sr1^ix	3.7637 (5)	O8—Sr1^x	2.522 (2)
Ga1—Sr1^x	3.7637 (5)	O8—Sr2^x	2.529 (2)
Ga1—Sr2^x	3.8580 (7)	O8—Sr1^ii	2.547 (2)
O8^i—Sr1—O8^ii	81.68 (8)	O1—Ga1—Sr1	46.96 (7)
O8^i—Sr1—O2^iii	77.43 (8)	O1^vi—Ga1—Sr1	110.60 (7)
O8^ii—Sr1—O2^iii	77.87 (8)	Sr2—Ga1—Sr1	67.737 (10)
O8^i—Sr1—O6	126.01 (7)	O4—Ga1—Sr1^vi	130.305 (9)
O8^ii—Sr1—O6	113.65 (8)	O6^vi—Ga1—Sr1^vi	44.59 (7)
O2^iii—Sr1—O6	153.95 (8)	O6—Ga1—Sr1^vi	110.33 (8)
O8^i—Sr1—O3	121.68 (8)	O1—Ga1—Sr1^vi	110.60 (7)
O8^ii—Sr1—O3	147.82 (8)	O1^vi—Ga1—Sr1^vi	46.96 (7)
O2^iii—Sr1—O3	85.73 (8)	Sr2—Ga1—Sr1^vi	67.737 (10)
O6—Sr1—O3	72.40 (8)	Sr1—Ga1—Sr1^vi	99.28 (2)
O8^i—Sr1—O1	71.34 (8)	O4—Ga1—Sr1^ix	46.245 (9)
O8^ii—Sr1—O1	83.45 (7)	O6^vi—Ga1—Sr1^ix	69.44 (8)
O2^iii—Sr1—O1	145.53 (7)	O6—Ga1—Sr1^ix	130.71 (8)
O6—Sr1—O1	60.51 (7)	O1—Ga1—Sr1^ix	135.32 (7)
O3—Sr1—O1	123.08 (7)	O1^vi—Ga1—Sr1^ix	74.43 (7)
O8^i—Sr1—O5^iv	144.01 (8)	Sr2—Ga1—Sr1^ix	117.169 (11)
O8^ii—Sr1—O5^iv	72.06 (8)	Sr1—Ga1—Sr1^ix	174.97 (2)
O2^iii—Sr1—O5^iv	73.39 (8)	Sr1^vi—Ga1—Sr1^ix	84.061 (7)
O6—Sr1—O5^iv	87.67 (8)	O4—Ga1—Sr1^x	46.245 (9)
O3—Sr1—O5^iv	76.82 (8)	O6^vi—Ga1—Sr1^x	130.71 (8)
O1—Sr1—O5^iv	127.46 (8)	O6—Ga1—Sr1^x	69.44 (8)
O8^i—Sr1—O4^i	69.02 (9)	O1—Ga1—Sr1^x	74.43 (7)
O8^ii—Sr1—O4^i	144.49 (9)	O1^vi—Ga1—Sr1^x	135.32 (7)
O2^iii—Sr1—O4^i	113.11 (9)	Sr2—Ga1—Sr1^x	117.169 (11)
O6—Sr1—O4^i	71.88 (9)	Sr1—Ga1—Sr1^x	84.061 (7)
O3—Sr1—O4^i	67.58 (9)	Sr1^vi—Ga1—Sr1^x	174.97 (2)
O1—Sr1—O4^i	68.75 (8)	Sr1^ix—Ga1—Sr1^x	92.369 (14)
O5^iv—Sr1—O4^i	142.77 (10)	O4—Ga1—Sr2^x	45.39 (11)
O8^i—Sr1—O2^ii	116.85 (7)	O6^vi—Ga1—Sr2^x	130.92 (8)
O8^ii—Sr1—O2^ii	46.05 (7)	O6—Ga1—Sr2^x	130.92 (8)
O2^iii—Sr1—O2^ii	113.33 (8)	O1—Ga1—Sr2^x	73.83 (7)
O6—Sr1—O2^ii	68.99 (7)	O1^vi—Ga1—Sr2^x	73.83 (7)
O3—Sr1—O2^ii	121.10 (7)	Sr2—Ga1—Sr2^x	83.182 (14)
O1—Sr1—O2^ii	70.25 (6)	Sr1—Ga1—Sr2^x	118.460 (10)
O5^iv—Sr1—O2^ii	59.14 (7)	Sr1^vi—Ga1—Sr2^x	118.460 (10)
O4^i—Sr1—O2^ii	133.25 (8)	Sr1^ix—Ga1—Sr2^x	62.449 (9)
O8^i—Sr1—B1^ii	95.70 (8)	Sr1^x—Ga1—Sr2^x	62.449 (9)
O8^ii—Sr1—B1^ii	22.13 (8)	O7—Ga2—O3	113.31 (15)
O2^iii—Sr1—B1^ii	97.57 (8)	O7—Ga2—O5	107.7 (2)
O6—Sr1—B1^ii	91.55 (9)	O3—Ga2—O5	115.35 (11)
O3—Sr1—B1^ii	142.08 (8)	O7—Ga2—O2^xi	96.10 (13)
O1—Sr1—B1^ii	71.89 (7)	O3—Ga2—O2^xi	114.34 (11)
O5^iv—Sr1—B1^ii	68.21 (8)	O5—Ga2—O2^xi	108.22 (11)
O4^i—Sr1—B1^ii	140.52 (9)	O7—Ga2—Sr2^xi	47.87 (13)
O2^ii—Sr1—B1^ii	24.75 (7)	O3—Ga2—Sr2^xi	97.28 (8)
O8^i—Sr1—B1^i	19.81 (8)	O5—Ga2—Sr2^xi	146.42 (9)
O8^ii—Sr1—B1^i	92.65 (8)	O2^xi—Ga2—Sr2^xi	61.29 (8)
O2^iii—Sr1—B1^i	63.62 (8)	O7—Ga2—Sr1^iv	118.15 (13)
O6—Sr1—B1^i	134.89 (8)	O3—Ga2—Sr1^iv	128.42 (8)
O3—Sr1—B1^i	104.65 (8)	O5—Ga2—Sr1^iv	44.77 (7)
O1—Sr1—B1^i	88.88 (8)	O2^xi—Ga2—Sr1^iv	64.05 (8)
O5^iv—Sr1—B1^i	136.59 (8)	Sr2^xi—Ga2—Sr1^iv	119.316 (12)
O4^i—Sr1—B1^i	66.08 (9)	O7—Ga2—Sr2^xii	51.02 (14)
O2^ii—Sr1—B1^i	134.09 (7)	O3—Ga2—Sr2^xii	155.48 (8)
B1^ii—Sr1—B1^i	110.62 (7)	O5—Ga2—Sr2^xii	62.82 (9)
O8^i—Sr1—B2^i	103.51 (8)	O2^xi—Ga2—Sr2^xii	87.97 (8)
O8^ii—Sr1—B2^i	144.16 (8)	Sr2^xi—Ga2—Sr2^xii	84.280 (11)
O2^iii—Sr1—B2^i	69.05 (8)	Sr1^iv—Ga2—Sr2^xii	69.337 (9)
O6—Sr1—B2^i	92.18 (8)	O7—Ga2—Sr1	129.04 (11)
O3—Sr1—B2^i	21.41 (8)	O3—Ga2—Sr1	36.33 (8)
O1—Sr1—B2^i	132.10 (8)	O5—Ga2—Sr1	79.01 (8)
O5^iv—Sr1—B2^i	85.32 (8)	O2^xi—Ga2—Sr1	130.69 (7)
O4^i—Sr1—B2^i	65.38 (9)	Sr2^xi—Ga2—Sr1	133.150 (13)
O2^ii—Sr1—B2^i	139.29 (7)	Sr1^iv—Ga2—Sr1	102.066 (10)
B1^ii—Sr1—B2^i	153.09 (8)	Sr2^xii—Ga2—Sr1	133.569 (13)
B1^i—Sr1—B2^i	84.95 (9)	O7—Ga2—Sr1^xiii	115.05 (13)
O8^i—Sr2—O8^v	117.09 (10)	O3—Ga2—Sr1^xiii	80.37 (8)
O8^i—Sr2—O1^vi	126.33 (7)	O5—Ga2—Sr1^xiii	122.92 (8)
O8^v—Sr2—O1^vi	72.87 (8)	O2^xi—Ga2—Sr1^xiii	34.24 (8)
O8^i—Sr2—O1	72.87 (8)	Sr2^xi—Ga2—Sr1^xiii	68.059 (9)
O8^v—Sr2—O1	126.33 (7)	Sr1^iv—Ga2—Sr1^xiii	81.375 (9)
O1^vi—Sr2—O1	62.64 (10)	Sr2^xii—Ga2—Sr1^xiii	122.171 (12)
O8^i—Sr2—O7^vii	121.43 (5)	Sr1—Ga2—Sr1^xiii	100.011 (10)
O8^v—Sr2—O7^vii	121.43 (5)	O8—B1—O1	123.3 (3)
O1^vi—Sr2—O7^vii	75.00 (9)	O8—B1—O2	119.0 (3)
O1—Sr2—O7^vii	75.00 (9)	O1—B1—O2	117.6 (3)
O8^i—Sr2—O4^i	68.00 (6)	O8—B1—Sr2	146.2 (2)
O8^v—Sr2—O4^i	68.00 (6)	O1—B1—Sr2	50.69 (15)
O1^vi—Sr2—O4^i	69.16 (8)	O2—B1—Sr2	76.1 (2)
O1—Sr2—O4^i	69.16 (8)	O8—B1—Sr2^x	47.13 (15)
O7^vii—Sr2—O4^i	137.76 (11)	O1—B1—Sr2^x	103.2 (2)
O8^i—Sr2—O7^viii	74.06 (6)	O2—B1—Sr2^x	116.9 (2)
O8^v—Sr2—O7^viii	74.06 (6)	Sr2—B1—Sr2^x	99.35 (9)
O1^vi—Sr2—O7^viii	146.60 (6)	O8—B1—Sr1^ii	45.15 (15)
O1—Sr2—O7^viii	146.60 (6)	O1—B1—Sr1^ii	160.3 (2)
O7^vii—Sr2—O7^viii	119.86 (13)	O2—B1—Sr1^ii	76.9 (2)
O4^i—Sr2—O7^viii	102.38 (10)	Sr2—B1—Sr1^ii	148.82 (11)
O8^i—Sr2—O2^vi	172.58 (7)	Sr2^x—B1—Sr1^ii	79.34 (8)
O8^v—Sr2—O2^vi	67.53 (7)	O8—B1—Sr1^x	39.15 (14)
O1^vi—Sr2—O2^vi	48.07 (7)	O1—B1—Sr1^x	92.5 (2)
O1—Sr2—O2^vi	99.73 (7)	O2—B1—Sr1^x	142.6 (2)
O7^vii—Sr2—O2^vi	54.53 (4)	Sr2—B1—Sr1^x	140.44 (11)
O4^i—Sr2—O2^vi	110.34 (6)	Sr2^x—B1—Sr1^x	72.62 (7)
O7^viii—Sr2—O2^vi	113.26 (6)	Sr1^ii—B1—Sr1^x	69.38 (7)
O8^i—Sr2—O2	67.53 (7)	O6—B2—O3^x	120.7 (3)
O8^v—Sr2—O2	172.58 (7)	O6—B2—O5	120.4 (3)
O1^vi—Sr2—O2	99.73 (7)	O3^x—B2—O5	118.9 (3)
O1—Sr2—O2	48.07 (7)	O6—B2—Sr1^x	84.4 (2)
O7^vii—Sr2—O2	54.53 (4)	O3^x—B2—Sr1^x	43.67 (15)
O4^i—Sr2—O2	110.34 (6)	O5—B2—Sr1^x	144.8 (2)
O7^viii—Sr2—O2	113.26 (6)	B1—O1—Ga1	128.4 (2)
O2^vi—Sr2—O2	107.26 (9)	B1—O1—Sr2	104.5 (2)
O8^i—Sr2—B1^vi	147.34 (8)	Ga1—O1—Sr2	102.30 (9)
O8^v—Sr2—B1^vi	76.33 (8)	B1—O1—Sr1	117.6 (2)
O1^vi—Sr2—B1^vi	24.81 (8)	Ga1—O1—Sr1	100.43 (9)
O1—Sr2—B1^vi	75.48 (8)	Sr2—O1—Sr1	98.94 (8)
O7^vii—Sr2—B1^vi	55.73 (8)	B1—O2—Ga2^vii	109.5 (2)
O4^i—Sr2—B1^vi	93.38 (8)	B1—O2—Sr1^iii	127.8 (2)
O7^viii—Sr2—B1^vi	137.92 (7)	Ga2^vii—O2—Sr1^iii	121.67 (11)
O2^vi—Sr2—B1^vi	25.76 (7)	B1—O2—Sr2	78.1 (2)
O2—Sr2—B1^vi	96.72 (8)	Ga2^vii—O2—Sr2	87.74 (9)
O8^i—Sr2—B1	76.33 (8)	Sr1^iii—O2—Sr2	93.50 (8)
O8^v—Sr2—B1	147.34 (8)	B1—O2—Sr1^ii	78.3 (2)
O1^vi—Sr2—B1	75.48 (8)	Ga2^vii—O2—Sr1^ii	85.53 (9)
O1—Sr2—B1	24.81 (8)	Sr1^iii—O2—Sr1^ii	113.33 (8)
O7^vii—Sr2—B1	55.73 (8)	Sr2—O2—Sr1^ii	151.75 (8)
O4^i—Sr2—B1	93.38 (8)	B2^i—O3—Ga2	124.9 (2)
O7^viii—Sr2—B1	137.92 (7)	B2^i—O3—Sr1	114.9 (2)
O2^vi—Sr2—B1	96.72 (8)	Ga2—O3—Sr1	119.36 (11)
O2—Sr2—B1	25.76 (7)	H—O4—Ga1	94 (6)
B1^vi—Sr2—B1	78.39 (12)	H—O4—Sr1^ix	71 (7)
O8^i—Sr2—B1^i	23.09 (8)	Ga1—O4—Sr1^ix	104.80 (7)
O8^v—Sr2—B1^i	98.01 (8)	H—O4—Sr1^x	102 (7)
O1^vi—Sr2—B1^i	136.49 (8)	Ga1—O4—Sr1^x	104.80 (7)
O1—Sr2—B1^i	94.58 (8)	Sr1^ix—O4—Sr1^x	149.97 (14)
O7^vii—Sr2—B1^i	137.72 (7)	H—O4—Sr2^x	154 (6)
O4^i—Sr2—B1^i	68.07 (8)	Ga1—O4—Sr2^x	106.71 (15)
O7^viii—Sr2—B1^i	53.61 (8)	Sr1^ix—O4—Sr2^x	88.18 (8)
O2^vi—Sr2—B1^i	163.92 (8)	Sr1^x—O4—Sr2^x	88.18 (8)
O2—Sr2—B1^i	87.77 (7)	B2—O5—Ga2	121.3 (2)
B1^vi—Sr2—B1^i	161.26 (12)	B2—O5—Sr1^iv	129.4 (2)
B1—Sr2—B1^i	99.35 (9)	Ga2—O5—Sr1^iv	106.26 (10)
O4—Ga1—O6^vi	104.43 (11)	B2—O5—Sr2^xii	109.0 (2)
O4—Ga1—O6	104.43 (11)	Ga2—O5—Sr2^xii	87.40 (9)
O6^vi—Ga1—O6	88.1 (2)	Sr1^iv—O5—Sr2^xii	88.22 (7)
O4—Ga1—O1	106.75 (11)	B2—O6—Ga1	128.9 (2)
O6^vi—Ga1—O1	148.81 (11)	B2—O6—Sr1	125.1 (2)
O6—Ga1—O1	84.93 (10)	Ga1—O6—Sr1	103.35 (10)
O4—Ga1—O1^vi	106.75 (11)	Ga2—O7—Ga2^vi	133.3 (2)
O6^vi—Ga1—O1^vi	84.93 (10)	Ga2—O7—Sr2^xi	102.70 (15)
O6—Ga1—O1^vi	148.81 (11)	Ga2^vi—O7—Sr2^xi	102.70 (15)
O1—Ga1—O1^vi	85.49 (14)	Ga2—O7—Sr2^xii	100.17 (15)
O4—Ga1—Sr2	128.57 (11)	Ga2^vi—O7—Sr2^xii	100.17 (15)
O6^vi—Ga1—Sr2	111.82 (7)	Sr2^xi—O7—Sr2^xii	119.86 (13)
O6—Ga1—Sr2	111.82 (7)	B1—O8—Sr1^x	121.0 (2)
O1—Ga1—Sr2	44.94 (7)	B1—O8—Sr2^x	109.8 (2)
O1^vi—Ga1—Sr2	44.94 (7)	Sr1^x—O8—Sr2^x	102.95 (8)
O4—Ga1—Sr1	130.305 (9)	B1—O8—Sr1^ii	112.7 (2)
O6^vi—Ga1—Sr1	110.33 (8)	Sr1^x—O8—Sr1^ii	98.32 (8)
O6—Ga1—Sr1	44.59 (7)	Sr2^x—O8—Sr1^ii	111.22 (9)

Symmetry codes: (i) x+1, y, z; (ii) −x, −y+1, −z+1; (iii) −x+1, −y+1, −z+1; (iv) −x, −y+1, −z; (v) x+1, −y+1/2, z; (vi) x, −y+1/2, z; (vii) x, y, z+1; (viii) x+1, y, z+1; (ix) x−1, −y+1/2, z; (x) x−1, y, z; (xi) x, y, z−1; (xii) x−1, y, z−1; (xiii) −x+1, −y+1, −z.