Literature DB >> 35974823

Sr9La2(WO6)4 containing [WO6] octa-hedra.

Rayko Simura1, Tomoki Watanabe1, Hisanori Yamane1.   

Abstract

A polycrystalline sample of Sr9La2(WO6)4, nona-strontium dilanthanum tetra-kis-[orthotungstate(VI)], was prepared by heating a compacted powder mixture of SrCO3, WO3, and La2O3 with an Sr:La:W molar ratio of 9:2:4 at 1473 K. X-ray crystal structure analysis was performed for a Sr9La2(WO6)4 single-crystal grain grown by reheating the sample at 1673 K. Sr9La2(WO6)4 crystallizes with four formula units in the tetra-gonal space group I41/a and is isotypic with Sr11(ReO6)4. Two W sites with site symmetries of are located at the center of isolated [WO6] octa-hedra, and four mixed (Sr/La) sites are surrounded by eight to twelve O atoms of the [WO6] octa-hedra. The structure of Sr9La2(WO6)4 can be described on the basis of the double-perovskite structure with [WO6] and [(Sr/La)O x ] polyhedra alternately placed, and a vacancy (□). © Simura et al. 2022.

Entities:  

Keywords:  crystal structure; double perovskite; tungstate

Year:  2022        PMID： 35974823      PMCID： PMC9361373          DOI： 10.1107/S2056989022006648

Source DB:  PubMed          Journal:  Acta Crystallogr E Crystallogr Commun


Chemical context

The alkaline-earth (A) rare-earth (Ln) tungstates A 9 Ln 2(WO6)4 have attracted attention as host crystals of phosphors, and various luminescence properties of these tungstates doped with activators such as Eu3+ and Mn4+ have been evaluated. For example, emissions of Eu3+ at ∼615 nm excited by ∼395 nm wavelength light have been reported for Sr9Gd1.5Eu0.5(WO6)4 (Blasse & Kemmler-Sack, 1983 ▸), Ca9Gd2–Eu (WO6)4 (Zeng et al., 2013 ▸), Ca9Eu2(WO6)4 (Qin et al., 2012 ▸; Zeng et al., 2010 ▸), Sr9Eu2(WO6)4 (Qin et al., 2012 ▸; Blasse & Kemmler-Sack, 1983 ▸; Zeng et al., 2010 ▸), and Ca9–Sr Eu2(WO6)4 (Zeng et al., 2009 ▸). Mn4+-doped Sr9Y2(WO6)4 (Shi et al., 2019 ▸) and Mn4+/Mg2+-doped Sr9Y2(WO6)4 (Zhou et al., 2020 ▸) were also studied, and deep-red luminescence with broad emission maxima at ∼680 nm were observed under excitation by light with a wavelength of 365 nm. Unit-cell parameters of a tetra­gonal cell with a = 11.664 (2) Å, c = 16.335 (4) Å (Smirnov et al., 1987 ▸) and a = 16.44 (7) Å, c = 16.32 (3) Å (Kemmler-Sack & Ehmann, 1981 ▸) have been reported for Sr9La2(WO6)4. However, details of the crystal structure, including atom positions, have not been clarified up to now. Sr9 Ln 2(WO6)4 compounds prepared by substituting Ln (a rare-earth element) for La in Sr9La2(WO6)4 have also been reported. These materials have tetra­gonal symmetry for Ln = La, Pr, and Nd; cubic (high-temperature phase) and tetra­gonal (low-temperature phase) symmetry for Sm, Eu, and Gd; monoclinic symmetry for Tb and Dy; and cubic symmetry for Ho, Er, Tm, and Y (Kemmler-Sack & Ehmann, 1981 ▸). The Sr atoms of Sr9La2(WO6)4 can also be replaced with Ca or Ba. For Ca9 Ln 2(WO6)4 (Ln = Nd, Sm, Eu, Gd, Tb, Dy), lattice parameters of a tetra­gonal unit-cell with 11.05 ≤ a ≤ 11.13 Å and 16.37 ≤ c ≤ 16.42 Å and space group I41/a have been reported (Smirnov et al., 1987 ▸). Ba9 Ln 2(WO6)4 compounds (Ln = La, Nd, Sm, Eu) are cubic (8.50 ≤ a ≤ 8.56 Å; Betz et al., 1982 ▸). The crystal structures of Sr9Gd2(WO6)4 [Fm , a = 16.47013 (6) Å] and Ba9La2(WO6)4 [Fm , a = 17.12339 (15) Å] have been fully analyzed (Ijdo et al., 2016 ▸). However, atomic positions for the tetra­gonal structures of Ca9 Ln 2(WO6)4 (Ln = Nd, Sm, Eu, Gd, Tb, Dy) compounds have not been determined. Here, we report on synthesis and crystal structure analysis of Sr9La2(WO6)4.

Structural commentary

The unit-cell parameters of Sr9La2(WO6)4 determined in the present investigation are consistent with those reported in previous studies (Smirnov et al., 1987 ▸; Kemmler-Sack & Ehmann, 1981 ▸). Fig. 1 ▸ displays the principal building units in the crystal structure of Sr9La2(WO6)4. W1 (multiplicity and Wyckoff letter 8d with site symmetry ) and W2 (8c, ) each are located at the center of a [WO6] octa­hedron. The [WO6] octa­hedra are isolated and surrounded by mixed-occupied (Sr,La) atoms. As detailed in Table 1 ▸, the inter­atomic distances between W and O are 1.901 (4)–1.934 (4) Å (average: 1.922 Å) for W1—O and 1.891 (4)–1.967 (4) Å (average: 1.925 Å) for W2—O. The bond-valence sums (BVS; Brown & Altermatt, 1985 ▸) for W1 and W2, as calculated using the parameters for W—O (R 0 = 1.921, B = 0.37) (Brese & O’Keeffe, 1991 ▸), are 5.994 and 5.957 valence units, respectively. These values are consistent with the valence state +VI for W.
Figure 1

The principal building units in the crystal structure of Sr9La2(WO6)4 with displacement ellipsoids drawn at the 99% probability level. Symmetry codes refer to Table 1 ▸.

Table 1

Selected bond lengths (Å)

Sr1/La1—O6i 2.333 (4)Sr3/La3—O1x 3.220 (4)
Sr1/La1—O22.438 (4)Sr4/La4—O12.607 (4)
Sr1/La1—O2ii 2.453 (4)Sr4/La4—O1vi 2.607 (4)
Sr1/La1—O4iii 2.458 (4)Sr4/La4—O1xi 2.607 (4)
Sr1/La1—O5iv 2.728 (4)Sr4/La4—O1ix 2.607 (4)
Sr1/La1—O3iii 2.765 (5)Sr4/La4—O42.998 (5)
Sr1/La1—O32.849 (5)Sr4/La4—O4xi 2.998 (5)
Sr1/La1—O1iii 2.861 (4)Sr4/La4—O4ix 2.998 (5)
Sr2/La2—O3v 2.470 (4)Sr4/La4—O4vi 2.998 (5)
Sr2/La2—O1vi 2.548 (4)Sr4/La4—O5i 3.131 (4)
Sr2/La2—O62.599 (4)Sr4/La4—O5xii 3.131 (4)
Sr2/La2—O2vii 2.603 (4)Sr4/La4—O5v 3.131 (4)
Sr2/La2—O12.642 (4)Sr4/La4—O5viii 3.131 (4)
Sr2/La2—O52.652 (4)W1—O31.901 (4)
Sr2/La2—O5v 2.704 (4)W1—O3xiii 1.901 (4)
Sr2/La2—O42.777 (4)W1—O6viii 1.930 (4)
Sr2/La2—O4v 2.877 (5)W1—O6xiv 1.930 (4)
Sr3/La3—O6i 2.557 (4)W1—O21.934 (4)
Sr3/La3—O6viii 2.557 (4)W1—O2xiii 1.934 (4)
Sr3/La3—O5viii 2.596 (4)W2—O4xi 1.891 (4)
Sr3/La3—O5i 2.596 (4)W2—O4v 1.891 (4)
Sr3/La3—O32.660 (4)W2—O1xv 1.917 (4)
Sr3/La3—O3ix 2.660 (4)W2—O11.917 (4)
Sr3/La3—O4ix 2.773 (4)W2—O5xi 1.967 (4)
Sr3/La3—O42.773 (4)W2—O5v 1.967 (4)
Sr3/La3—O1iii 3.220 (4)  

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) ; (vi) ; (vii) ; (viii) ; (ix) ; (x) ; (xi) ; (xii) ; (xiii) ; (xiv) ; (xv) .

The Sr/La occupancies for (Sr/La)1 (16f, 1), (Sr/La)2 (16f, 1), (Sr/La)3 (8e, 2..), and (Sr/La)4 (4a, ..) are 0.6384/0.3616 (19), 0.8913/0.1087 (18), 0.948/0.052 (4), and 0.985/0.015 (7), respectively. The inter­atomic distances between (Sr/La) and O and the coordination numbers of the cations are 2.333 (4)–2.861 (4) Å (average: 2.611 Å) and 8 for (Sr/La)1—O; 2.470 (4)–2.877 (5) Å (average: 2.660 Å) and 8 for (Sr/La)2—O; 2.557 (4)–3.220 (4) Å (average: 2.761 Å) and 10 for (Sr/La)3—O; and 2.607 (4)–3.131 (4) Å (average: 2.912 Å) and 12 for (Sr/La)4—O. As the La occupancy increases, the (Sr/La)—O inter­atomic distance decreases. The crystal structures of alkaline-earth and rare-earth tungstates are often described in relation to the double-perovskite structure type (Kemmler-Sack & Ehmann, 1981 ▸; Betz et al., 1982 ▸; Blasse & Kemmler-Sack, 1983 ▸; King et al., 2010 ▸; Ijdo et al., 2016 ▸). In the double-perovskite (A 2 BB′O6) structure, B and B′ atoms alternately occupy the B site of the perovskite (ABO3) structure. The B site is at the center of an octa­hedron formed by O atoms, and the vertex-sharing [BO6] and [B′O6] octa­hedra regularly align in the A 8 simple cubic lattice frame in the double-perovskite structure. In case of the structure of Sr9La2(WO6)4, a (Sr/La,□)8 distorted simple lattice can be derived by connecting the Sr-rich sites of (Sr/La)2, (Sr/La)3, and (Sr/La)4 and a vacancy site at (1/2, 3/4, 1/8), as shown in Fig. 2 ▸. In the distorted lattice, the [WO6] octa­hedra and the [(Sr/La)1O8] polyhedra are alternately located by sharing four vertices and two edges of the [(Sr/La)1O8] polyhedra (Fig. 2 ▸).
Figure 2

[WO6] octa­hedra and [(Sr/La)1O8] polyhedra alternately distributed in the distorted (Sr/La2–4,□)8 lattice as illustrated for the planes parallel to (001) in (a) and (110) in (b). Note that [WO6] octa­hedra and [(Sr/La)1O8] polyhedra are connected to each other by vertex- or edge-sharing.

The crystal structure of Sr9La2(WO6)4 is isotypic with those of Sr11(ReO6)4 [a = 11.6779 (1), c = 16.1488 (2); Bramnik et al., 2000 ▸], Ba11(OsO6)4 [a = 12.2414 (1), c = 16.6685 (1); Wakeshima & Hinatsu, 2005 ▸], La9Sr(IrO6)4 [a = 11.5955 (11), c = 16.2531 (15); Ferreira et al., 2018 ▸], and Sr11(MoO6)4 [a = 11.6107 (6), c = 16.4219 (13); Löpez et al., 2016 ▸].

Synthesis and crystallization

Raw powdered materials of SrCO3 (Hakushin Chemical Laboratory, 98%), WO3 (Furuuchi Chemical, 99.99%), and La2O3 (FUJIFILM Wako Pure Chemical, 99.99%; calcined at 1273 K in advance) were weighed in a Sr:La:W molar ratio of 9:2:4, mixed in an agate mortar, and pressed into a cylindrical pellet with a diameter of 6 mm. The pellet was placed on a Pt plate in an alumina crucible with a lid (Nikkato, SSA-S) and heated to 1473 K at a rate of 300 K h−1 in a furnace. This temperature was maintained for 10 h, and the power to the heater of the furnace was then shut off. After the sample had cooled to room temperature, the sintered pellet was crushed, pressed into a pellet, and heated again under the same conditions. This procedure was performed three times. Part of the sintered pellet was then placed on a Pt plate in an alumina crucible, heated at 1673 K for 6 h, and cooled to room temperature at a rate of −400 K h−1. The obtained crystalline sample was an aggregate consisting of ∼50 µm single-crystalline grains. A single crystal selected from the aggregate was placed on top of a glass fiber for X-ray structure analysis. Another single crystal was embedded in resin, mirror polished, and carbon coated in preparation for chemical analysis using an electron microprobe analyzer (EPMA; JEOL JXA-8200). The chemical composition determined by EPMA was Sr: 23.2 (4), La: 4.8 (1), W: 10.3 (3), and O: 61.7 (5) wt%. The Sr:La:W:O atomic ratio of 9.1 (1): 1.9 (1): 4.0 (1): 24.0 (2) calculated from the composition is consistent with the chemical formula Sr9La2(WO6)4.

Refinement

The results of the crystal structure analysis are summarized in Table 2 ▸. An initial structure model with two W sites, four Sr sites, and six O sites using isotropic displacement parameters showed residual electron density distribution around the four Sr sites. These sites were changed to Sr/La mixed sites, and their occupancies were refined under consideration of full occupancy, resulting in an Sr:La:W:O atomic ratio of 35.6:8.4:16:96. Given the charge balance, the numbers of Sr and La atoms in the unit cell was constrained to be 36 and 8, respectively.
Table 2

Experimental details

Crystal data
Chemical formulaSr9La2(WO6)4
M r 2185.80
Crystal system, space groupTetragonal, I41/a
Temperature (K)300
a, c (Å)11.6365 (3), 16.3040 (4)
V (Å3)2207.69 (13)
Z 4
Radiation typeMo Kα
μ (mm−1)46.16
Crystal size (mm)0.05 × 0.04 × 0.03
 
Data collection
DiffractometerBruker D8 QUEST
Absorption correctionMulti-scan (SADABS; Krause et al., 2015 ▸)
T min, T max 0.20, 0.33
No. of measured, independent and observed [I > 2σ(I)] reflections62981, 2106, 1972
R int 0.048
(sin θ/λ)max (Å−1)0.770
 
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S 0.025, 0.046, 1.37
No. of reflections2106
No. of parameters97
No. of restraints1
Δρmax, Δρmin (e Å−3)1.14, −1.50

Computer programs: APEX3 and SAINT (Bruker, 2018 ▸), SHELXT2014/5 (Sheldrick, 2015a ▸), SHELXL2018/3 (Sheldrick, 2015b ▸), VESTA (Momma & Izumi, 2011 ▸) and publCIF (Westrip, 2010 ▸).

Crystal structure: contains datablock(s) I. DOI: 10.1107/S2056989022006648/wm5650sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989022006648/wm5650Isup2.hkl CCDC reference: 2182445 Additional supporting information: crystallographic information; 3D view; checkCIF report
Sr9La2(WO6)4Dx = 6.576 Mg m−3
Mr = 2185.80Mo Kα radiation, λ = 0.71073 Å
Tetragonal, I41/aCell parameters from 9792 reflections
a = 11.6365 (3) Åθ = 3.5–33.2°
c = 16.3040 (4) ŵ = 46.16 mm−1
V = 2207.69 (13) Å3T = 300 K
Z = 4Granular, translucent colourless
F(000) = 37760.05 × 0.04 × 0.03 mm
Bruker D8 QUEST diffractometer2106 independent reflections
Radiation source: sealed X-ray tube1972 reflections with I > 2σ(I)
Detector resolution: 7.3910 pixels mm-1Rint = 0.048
ω and σcansθmax = 33.2°, θmin = 2.2°
Absorption correction: multi-scan (SADABS; Krause et al., 2015)h = −17→17
Tmin = 0.20, Tmax = 0.33k = −17→17
62981 measured reflectionsl = −25→25
Refinement on F21 restraint
Least-squares matrix: fullw = 1/[σ2(Fo2) + 62.4087P] where P = (Fo2 + 2Fc2)/3
R[F2 > 2σ(F2)] = 0.025(Δ/σ)max = 0.001
wR(F2) = 0.046Δρmax = 1.14 e Å−3
S = 1.37Δρmin = −1.50 e Å−3
2106 reflectionsExtinction correction: SHELXL-2014/7 (Sheldrick, 2015b), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
97 parametersExtinction coefficient: 0.000055 (5)
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
xyzUiso*/UeqOcc. (<1)
Sr10.20878 (3)0.22538 (3)0.53417 (2)0.00769 (8)0.6384 (19)
La10.20878 (3)0.22538 (3)0.53417 (2)0.00769 (8)0.3616 (19)
Sr20.23647 (4)0.04341 (4)0.11357 (3)0.00718 (9)0.8913 (18)
La20.23647 (4)0.04341 (4)0.11357 (3)0.00718 (9)0.1087 (18)
Sr30.00000.25000.36535 (4)0.00934 (14)0.948 (4)
La30.00000.25000.36535 (4)0.00934 (14)0.052 (4)
Sr40.00000.25000.12500.0267 (4)0.985 (7)
La40.00000.25000.12500.0267 (4)0.015 (7)
W10.00000.00000.50000.00522 (6)
W20.00000.00000.00000.00502 (6)
O10.0101 (3)0.0266 (3)0.1158 (2)0.0093 (7)
O20.0795 (3)0.0786 (3)0.5877 (2)0.0099 (7)
O30.1059 (4)0.0651 (4)0.4243 (3)0.0137 (8)
O40.1383 (4)0.1321 (4)0.2554 (3)0.0148 (8)
O50.3675 (3)0.1315 (3)0.2308 (2)0.0109 (7)
O60.4011 (3)0.1285 (3)0.0246 (2)0.0096 (7)
U11U22U33U12U13U23
Sr10.00728 (15)0.00640 (15)0.00939 (16)0.00166 (12)−0.00049 (12)0.00060 (12)
La10.00728 (15)0.00640 (15)0.00939 (16)0.00166 (12)−0.00049 (12)0.00060 (12)
Sr20.00722 (17)0.00602 (17)0.00830 (18)−0.00036 (14)0.00015 (14)−0.00025 (14)
La20.00722 (17)0.00602 (17)0.00830 (18)−0.00036 (14)0.00015 (14)−0.00025 (14)
Sr30.0127 (3)0.0080 (3)0.0074 (3)−0.0024 (2)0.0000.000
La30.0127 (3)0.0080 (3)0.0074 (3)−0.0024 (2)0.0000.000
Sr40.0091 (3)0.0091 (3)0.0620 (10)0.0000.0000.000
La40.0091 (3)0.0091 (3)0.0620 (10)0.0000.0000.000
W10.00463 (11)0.00540 (11)0.00562 (11)−0.00008 (8)0.00033 (8)0.00085 (8)
W20.00472 (11)0.00554 (11)0.00480 (11)0.00064 (8)−0.00001 (8)−0.00041 (8)
O10.0062 (14)0.0135 (17)0.0081 (16)−0.0004 (12)−0.0012 (12)−0.0019 (13)
O20.0116 (16)0.0106 (16)0.0073 (16)−0.0022 (13)0.0000 (13)−0.0007 (13)
O30.0128 (17)0.0134 (18)0.0149 (19)0.0023 (14)0.0071 (14)0.0062 (14)
O40.0184 (19)0.0141 (18)0.0118 (18)−0.0098 (15)0.0025 (15)−0.0006 (15)
O50.0117 (17)0.0112 (17)0.0098 (17)0.0032 (13)0.0018 (13)0.0006 (13)
O60.0097 (16)0.0092 (16)0.0098 (16)0.0027 (12)−0.0009 (13)−0.0005 (13)
Sr1/La1—O6i2.333 (4)Sr3/La3—O1xi3.220 (4)
Sr1/La1—O22.438 (4)Sr3/La3—W2xi3.4641 (4)
Sr1/La1—O2ii2.453 (4)Sr3/La3—W2iii3.4641 (4)
Sr1/La1—O4iii2.458 (4)Sr4/La4—O12.607 (4)
Sr1/La1—O5iv2.728 (4)Sr4/La4—O1vii2.607 (4)
Sr1/La1—O3iii2.765 (5)Sr4/La4—O1xii2.607 (4)
Sr1/La1—O32.849 (5)Sr4/La4—O1x2.607 (4)
Sr1/La1—O1iii2.861 (4)Sr4/La4—O42.998 (5)
Sr1/La1—Sr2/La2v3.4446 (6)Sr4/La4—O4xii2.998 (5)
Sr1/La1—Sr2/La2v3.4446 (6)Sr4/La4—O4x2.998 (5)
Sr1/La1—W1iii3.5630 (4)Sr4/La4—O4vii2.998 (5)
Sr1/La1—W13.6181 (4)Sr4/La4—O5i3.131 (4)
Sr2/La2—O3vi2.470 (4)Sr4/La4—O5xiii3.131 (4)
Sr2/La2—O1vii2.548 (4)Sr4/La4—O5vi3.131 (4)
Sr2/La2—O62.599 (4)Sr4/La4—O5ix3.131 (4)
Sr2/La2—O2viii2.603 (4)W1—O31.901 (4)
Sr2/La2—O12.642 (4)W1—O3xiv1.901 (4)
Sr2/La2—O52.652 (4)W1—O6ix1.930 (4)
Sr2/La2—O5vi2.704 (4)W1—O6v1.930 (4)
Sr2/La2—O42.777 (4)W1—O21.934 (4)
Sr2/La2—O4vi2.877 (5)W1—O2xiv1.934 (4)
Sr2/La2—W2iii3.2790 (4)W1—Sr1/La1xv3.5629 (4)
Sr2/La2—W23.3549 (4)W1—Sr1/La1vi3.5629 (4)
Sr2/La2—Sr1viii3.4446 (6)W1—Sr2/La2ix3.6177 (4)
Sr3/La3—O6i2.557 (4)W1—Sr2/La2v3.6177 (4)
Sr3/La3—O6ix2.557 (4)W2—O4xii1.891 (4)
Sr3/La3—O5ix2.596 (4)W2—O4vi1.891 (4)
Sr3/La3—O5i2.596 (4)W2—O1xvi1.917 (4)
Sr3/La3—O32.660 (4)W2—O11.917 (4)
Sr3/La3—O3x2.660 (4)W2—O5xii1.967 (4)
Sr3/La3—O4x2.773 (4)W2—O5vi1.967 (4)
Sr3/La3—O42.773 (4)W2—Sr2/La2xii3.2790 (4)
Sr3/La3—O1iii3.220 (4)W2—Sr2/La2vi3.2790 (4)
O6i—Sr1/La1—O2108.65 (13)W2xi—Sr3/La3—W2iii114.236 (19)
O6i—Sr1/La1—O2ii83.84 (13)O1—Sr4/La4—O1vii90.189 (10)
O2—Sr1/La1—O2ii86.10 (14)O1—Sr4/La4—O1xii90.189 (10)
O6i—Sr1/La1—O4iii139.77 (14)O1vii—Sr4/La4—O1xii173.41 (17)
O2—Sr1/La1—O4iii101.40 (14)O1—Sr4/La4—O1x173.41 (17)
O2ii—Sr1/La1—O4iii125.03 (13)O1vii—Sr4/La4—O1x90.189 (10)
O6i—Sr1/La1—O5iv83.02 (13)O1xii—Sr4/La4—O1x90.189 (10)
O2—Sr1/La1—O5iv163.00 (12)O1—Sr4/La4—O463.92 (11)
O2ii—Sr1/La1—O5iv82.86 (13)O1vii—Sr4/La4—O456.25 (11)
O4iii—Sr1/La1—O5iv74.87 (14)O1xii—Sr4/La4—O4118.30 (11)
O6i—Sr1/La1—O3iii146.51 (13)O1x—Sr4/La4—O4121.40 (11)
O2—Sr1/La1—O3iii74.94 (12)O1—Sr4/La4—O4xii56.25 (11)
O2ii—Sr1/La1—O3iii62.93 (12)O1vii—Sr4/La4—O4xii121.40 (11)
O4iii—Sr1/La1—O3iii66.83 (13)O1xii—Sr4/La4—O4xii63.92 (11)
O5iv—Sr1/La1—O3iii88.51 (12)O1x—Sr4/La4—O4xii118.30 (11)
O6i—Sr1/La1—O389.34 (13)O4—Sr4/La4—O4xii120.17 (10)
O2—Sr1/La1—O360.49 (12)O1—Sr4/La4—O4x121.40 (11)
O2ii—Sr1/La1—O3141.63 (12)O1vii—Sr4/La4—O4x118.30 (11)
O4iii—Sr1/La1—O382.66 (13)O1xii—Sr4/La4—O4x56.25 (11)
O5iv—Sr1/La1—O3133.77 (12)O1x—Sr4/La4—O4x63.92 (11)
O3iii—Sr1/La1—O3118.90 (13)O4—Sr4/La4—O4x89.71 (17)
O6i—Sr1/La1—O1iii73.37 (12)O4xii—Sr4/La4—O4x120.17 (10)
O2—Sr1/La1—O1iii123.73 (12)O1—Sr4/La4—O4vii118.30 (11)
O2ii—Sr1/La1—O1iii146.75 (12)O1vii—Sr4/La4—O4vii63.92 (11)
O4iii—Sr1/La1—O1iii67.80 (12)O1xii—Sr4/La4—O4vii121.40 (11)
O5iv—Sr1/La1—O1iii70.80 (11)O1x—Sr4/La4—O4vii56.25 (11)
O3iii—Sr1/La1—O1iii133.60 (11)O4—Sr4/La4—O4vii120.17 (10)
O3—Sr1/La1—O1iii63.35 (11)O4xii—Sr4/La4—O4vii89.71 (17)
Sr2/La2v—Sr1/La1—W161.565 (10)O4x—Sr4/La4—O4vii120.17 (10)
W1iii—Sr1/La1—W1107.502 (10)O1—Sr4/La4—O5i117.41 (11)
O3vi—Sr2/La2—O1vii143.76 (14)O1vii—Sr4/La4—O5i56.35 (11)
O3vi—Sr2/La2—O6137.69 (13)O1xii—Sr4/La4—O5i117.90 (11)
O1vii—Sr2/La2—O674.95 (12)O1x—Sr4/La4—O5i68.03 (11)
O3vi—Sr2/La2—O2viii77.47 (13)O4—Sr4/La4—O5i53.49 (10)
O1vii—Sr2/La2—O2viii127.58 (12)O4xii—Sr4/La4—O5i173.65 (10)
O6—Sr2/La2—O2viii60.75 (12)O4x—Sr4/La4—O5i62.02 (10)
O3vi—Sr2/La2—O171.74 (13)O4vii—Sr4/La4—O5i94.03 (11)
O1vii—Sr2/La2—O190.70 (17)O1—Sr4/La4—O5xiii117.90 (11)
O6—Sr2/La2—O1140.44 (12)O1vii—Sr4/La4—O5xiii117.41 (11)
O2viii—Sr2/La2—O1141.44 (12)O1xii—Sr4/La4—O5xiii68.03 (11)
O3vi—Sr2/La2—O5101.06 (13)O1x—Sr4/La4—O5xiii56.35 (11)
O1vii—Sr2/La2—O563.69 (12)O4—Sr4/La4—O5xiii173.65 (10)
O6—Sr2/La2—O580.29 (12)O4xii—Sr4/La4—O5xiii62.02 (10)
O2viii—Sr2/La2—O581.63 (12)O4x—Sr4/La4—O5xiii94.03 (11)
O1—Sr2/La2—O5126.30 (12)O4vii—Sr4/La4—O5xiii53.49 (10)
O3vi—Sr2/La2—O5vi118.64 (12)O5i—Sr4/La4—O5xiii124.29 (9)
O1vii—Sr2/La2—O5vi76.11 (12)O1—Sr4/La4—O5vi56.35 (11)
O6—Sr2/La2—O5vi78.82 (12)O1vii—Sr4/La4—O5vi68.03 (11)
O2viii—Sr2/La2—O5vi117.51 (12)O1xii—Sr4/La4—O5vi117.41 (11)
O1—Sr2/La2—O5vi61.87 (12)O1x—Sr4/La4—O5vi117.90 (11)
O5—Sr2/La2—O5vi138.23 (9)O4—Sr4/La4—O5vi94.03 (11)
O3vi—Sr2/La2—O483.96 (13)O4xii—Sr4/La4—O5vi53.49 (10)
O1vii—Sr2/La2—O459.86 (12)O4x—Sr4/La4—O5vi173.65 (10)
O6—Sr2/La2—O4128.74 (12)O4vii—Sr4/La4—O5vi62.02 (10)
O2viii—Sr2/La2—O4132.50 (13)O5i—Sr4/La4—O5vi124.29 (9)
O1—Sr2/La2—O466.80 (12)O5xiii—Sr4/La4—O5vi82.71 (14)
O5—Sr2/La2—O459.51 (12)O1—Sr4/La4—O5ix68.03 (11)
O5vi—Sr2/La2—O4109.81 (13)O1vii—Sr4/La4—O5ix117.90 (11)
O3vi—Sr2/La2—O4vi64.87 (13)O1xii—Sr4/La4—O5ix56.35 (11)
O1vii—Sr2/La2—O4vi132.31 (11)O1x—Sr4/La4—O5ix117.41 (11)
O6—Sr2/La2—O4vi104.51 (12)O4—Sr4/La4—O5ix62.02 (10)
O2viii—Sr2/La2—O4vi87.33 (12)O4xii—Sr4/La4—O5ix94.03 (11)
O1—Sr2/La2—O4vi58.90 (11)O4x—Sr4/La4—O5ix53.49 (10)
O5—Sr2/La2—O4vi163.87 (12)O4vii—Sr4/La4—O5ix173.65 (10)
O5vi—Sr2/La2—O4vi57.69 (11)O5i—Sr4/La4—O5ix82.71 (14)
O4—Sr2/La2—O4vi123.12 (9)O5xiii—Sr4/La4—O5ix124.29 (9)
W2iii—Sr2/La2—W2121.613 (13)O5vi—Sr4/La4—O5ix124.29 (9)
W2iii—Sr2/La2—Sr1/La1viii155.754 (16)O3—W1—O3xiv180.0
W2—Sr2/La2—Sr1/La1viii78.905 (11)O3—W1—O6ix86.73 (17)
O6i—Sr3/La3—O6ix90.91 (18)O3xiv—W1—O6ix93.27 (17)
O6i—Sr3/La3—O5ix169.96 (12)O3—W1—O6v93.27 (17)
O6ix—Sr3/La3—O5ix82.12 (12)O3xiv—W1—O6v86.73 (17)
O6i—Sr3/La3—O5i82.12 (12)O6ix—W1—O6v180.0 (2)
O6ix—Sr3/La3—O5i169.96 (12)O3—W1—O288.94 (18)
O5ix—Sr3/La3—O5i105.66 (18)O3xiv—W1—O291.06 (18)
O6i—Sr3/La3—O389.14 (13)O6ix—W1—O294.18 (16)
O6ix—Sr3/La3—O360.52 (12)O6v—W1—O285.82 (16)
O5ix—Sr3/La3—O393.66 (13)O3—W1—O2xiv91.07 (18)
O5i—Sr3/La3—O3111.89 (12)O3xiv—W1—O2xiv88.93 (18)
O6i—Sr3/La3—O3x60.52 (12)O6ix—W1—O2xiv85.82 (16)
O6ix—Sr3/La3—O3x89.14 (13)O6v—W1—O2xiv94.18 (16)
O5ix—Sr3/La3—O3x111.89 (12)O2—W1—O2xiv180.0
O5i—Sr3/La3—O3x93.66 (13)Sr1/La1xv—W1—Sr1/La1vi180.0
O3—Sr3/La3—O3x137.62 (19)Sr1/La1vi—W1—Sr1/La1vi0.0
O6i—Sr3/La3—O4x116.21 (12)Sr1/La1xv—W1—Sr1/La1xv0.0
O6ix—Sr3/La3—O4x117.76 (12)Sr1/La1vi—W1—Sr1/La1xv180.0
O5ix—Sr3/La3—O4x61.78 (12)Sr1/La1xv—W1—Sr2/La2ix114.745 (9)
O5i—Sr3/La3—O4x72.02 (12)Sr1/La1vi—W1—Sr2/La2ix65.255 (9)
O3—Sr3/La3—O4x154.56 (13)Sr1/La1xv—W1—Sr2/La2ix114.745 (9)
O3x—Sr3/La3—O4x64.19 (13)Sr1/La1xv—W1—Sr2/La2v65.255 (9)
O6i—Sr3/La3—O4117.76 (12)Sr1/La1vi—W1—Sr2/La2v114.745 (9)
O6ix—Sr3/La3—O4116.21 (12)Sr2/La2ix—W1—Sr2/La2v180.000 (12)
O5ix—Sr3/La3—O472.02 (12)O4xii—W2—O4vi180.0 (3)
O5i—Sr3/La3—O461.78 (12)O4xii—W2—O1xvi91.21 (17)
O3—Sr3/La3—O464.19 (13)O4vi—W2—O1xvi88.79 (17)
O3x—Sr3/La3—O4154.56 (13)O4xii—W2—O188.80 (17)
O4x—Sr3/La3—O499.40 (19)O4vi—W2—O191.20 (17)
O6i—Sr3/La3—O1iii64.45 (11)O1xvi—W2—O1180.0
O6ix—Sr3/La3—O1iii115.34 (11)O4xii—W2—O5xii88.65 (18)
O5ix—Sr3/La3—O1iii125.14 (11)O4vi—W2—O5xii91.35 (18)
O5i—Sr3/La3—O1iii55.05 (11)O1xvi—W2—O5xii90.08 (16)
O3—Sr3/La3—O1iii60.43 (11)O1—W2—O5xii89.92 (16)
O3x—Sr3/La3—O1iii119.46 (11)O4xii—W2—O5vi91.35 (18)
O4x—Sr3/La3—O1iii126.84 (11)O4vi—W2—O5vi88.65 (18)
O4—Sr3/La3—O1iii53.37 (11)O1xvi—W2—O5vi89.92 (16)
O6i—Sr3/La3—O1xi115.34 (11)O1—W2—O5vi90.08 (16)
O6ix—Sr3/La3—O1xi64.45 (11)O5xii—W2—O5vi180.0 (3)
O5ix—Sr3/La3—O1xi55.05 (11)Sr2/La2xii—W2—Sr2/La2vi180.0
O5i—Sr3/La3—O1xi125.14 (11)Sr2/La2xii—W2—Sr2/La2xii0.0
O3—Sr3/La3—O1xi119.46 (11)Sr2/La2vi—W2—Sr2/La2xii180.00 (2)
O3x—Sr3/La3—O1xi60.43 (11)Sr2/La2vi—W2—Sr2/La2vi0.000 (11)
O4x—Sr3/La3—O1xi53.37 (11)Sr2/La2xii—W2—Sr2/La2102.7
O4—Sr3/La3—O1xi126.84 (11)Sr2/La2vi—W2—Sr2/La277.309 (8)
O1iii—Sr3/La3—O1xi179.73 (14)Sr2/La2xii—W2—Sr2/La2102.691 (8)
  5 in total

1.  Crystal structure and phase transitions in Sr3WO6.

Authors:  Graham King; Artem M Abakumov; J Hadermann; Anastasiya M Alekseeva; Marina G Rozova; Tyche Perkisas; Patrick M Woodward; Gustaaf Van Tendeloo; Evgeny V Antipov
Journal:  Inorg Chem       Date:  2010-07-05       Impact factor: 5.165

2.  A Family of A-Site Cation-Deficient Double-Perovskite-Related Iridates: Ln9Sr2Ir4O24 (Ln = La, Pr, Nd, Sm).

Authors:  Timothy Ferreira; Mark D Smith; Hans-Conrad Zur Loye
Journal:  Inorg Chem       Date:  2018-06-21       Impact factor: 5.165

3.  Comparison of silver and molybdenum microfocus X-ray sources for single-crystal structure determination.

Authors:  Lennard Krause; Regine Herbst-Irmer; George M Sheldrick; Dietmar Stalke
Journal:  J Appl Crystallogr       Date:  2015-01-30       Impact factor: 3.304

4.  SHELXT - integrated space-group and crystal-structure determination.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A Found Adv       Date:  2015-01-01       Impact factor: 2.290

5.  Crystal structure refinement with SHELXL.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr C Struct Chem       Date:  2015-01-01       Impact factor: 1.172
  5 in total

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