Penta­terbium lithium tris­­tannide, Tb₅LiSn₃

The new ternary phase penta­terbium lithium tris­tannide, Tb₅LiSn₃, crystallizes in the hexa­gonal Hf₅CuSn₃ structure type, which is a `filled' version of the binary RE₅Sn₃ phases (Mn₅Si₃-type) (RE is rare earth). The asymmetric unit contains two Tb sites (site symmetries 3.2 and m2m), one Li site (site symmetry .m) and one Sn site (site symmetry m2m). The 14-vertex Frank–Kasper polyhedra are typical for Li and Tb atoms. The environment of the Sn atom is a pseudo-Frank–Kasper polyhedron with a coordination number of 13 for the tin atom. One of the Tb atoms is enclosed in a 17-vertex polyhedron. The metallic type of bonding was indicated by an analysis of the inter­atomic distances.

Related literature

For the Hf₅CuSn₃ structure type, see: Rieger & Parthé (1965). For related structures, see: Pavlyuk & Bodak (1992a,b); Pavlyuk et al. (1989, 1991, 1993). For the magnetic properties of related compounds, see: Tran et al. (2008).

Experimental

Crystal data

• Tb₅LiSn₃

• M_r = 1157.72

• Hexagonal, P 6₃ /m c m

• a = 9.0122 (14) Å

• c = 6.5744 (13) Å

• V = 462.4 (2) ų

• Z = 2

• Mo Kα radiation

• μ = 45.56 mm⁻¹

• T = 293 K

• 0.07 × 0.05 × 0.03 mm

Data collection

• Oxford Diffraction Xcalibur3 CCD diffractometer

• Absorption correction: analytical (CrysAlis RED; Oxford Diffraction, 2008) T_min = 0.322, T_max = 0.657

• 1907 measured reflections

• 216 independent reflections

• 207 reflections with I > 2σ(I)

• R_int = 0.021

Refinement

• R[F² > 2σ(F²)] = 0.021

• wR(F²) = 0.066

• S = 1.33

• 216 reflections

• 14 parameters

• Δρ_max = 1.08 e Å⁻³

• Δρ_min = −1.47 e Å⁻³

Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell refinement: CrysAlis CCD; data reduction: CrysAlis RED (Oxford Diffraction, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXL97.

Supporting information

S1. Comment

The RE₅TM₃ (RE - rare earth, T - Cu, Ag and M - Sn, Pb) ternary stannides crystallize in a hexagonal Hf₅CuSn₃ (superstructure to Ti₅Ga₄-type) with space group P6₃/mcm (Rieger and Parthé, 1965). These intermetallic compounds are characterized by two different sites for the RE atoms located at 4 d and 6 g, respectively. The Sn or Pb atoms are located at the next 6 g site and the transitions atoms occupy 2 b site.The RE₅TM₃ intermetallics are 'filled' version of the binary RE₅M₃ phases which crystallize in Mn₅Si₃ structure type. It is also possible, that the transition metals fill the octahedral voids.

For the Ce based compounds, Ce₅TM₃, investigated by (Tran et al., 2008) are found multiple magnetic phase transitions at low temperatures and discussed the role of f-spd hybridization on the evolution of heavy-fermion behaviour.

We detected the new ternary compound during the systematic study of ternary alloys of Tb—Li—Sn system from the concentration region with low content of lithium. The powder diffraction pattern of this compound is similar to the powder pattern of the RE₅Sn₃ (RE - rare-earth metals) binary phases, but has some differences. So we decided to further study this phase using single-crystal method. Obtained single-crystal data show that the title compound crystallizes with the hexagonal space group P6₃/mcm as a Hf₅CuSn₃ type. The projection of the unit cell and coordination polyhedra of the atoms are shown in Fig. 1. The distribution of tin and lithium atoms in three-dimensional-nets consisted of Tb atoms are shown in Fig. 2.

The number of neighbouring atoms correlates well with the dimensions of the central atoms. The Tb atoms are enclosed in 14- and 17-vertex polyhedra. The coordination polyhedron of the Sn atom is pseudo Frank-Kasper polyhedron with CN=13. Lithium atom is surrounded by 14 neighbours atoms in the form of 14-vertex Frank-Kasper polyhedron. The shortest interatomic distances in the title compound are in the typical for intermetallic compounds ranges and indicate metallic type of bonding.

In the title compound lithium atoms occupy the same crystallographic position that the atoms of transition metal in the original structure type. The same was observed previously when we studied RELiSn₂ compounds with the CeNiSi₂ structure type (Pavlyuk et al., 1989), RELiGe with the ZrNiAl type (Pavlyuk et al., 1991 and Pavlyuk & Bodak, 1992a), RE₃Li₂Ge₃ with Hf₃Ni₂Si₃ type (Pavlyuk & Bodak, 1992b), solid solutions RLi_xCu_{2 - x}Si₂ and RLi_xCu_{2 - x}Ge₂ (Pavlyuk et al., 1993).

Related literature

For the Hf₅CuSn₃ structure type, see: Rieger & Parthé (1965). For related structures, see: Pavlyuk & Bodak (1992a,b); Pavlyuk et al. (1989, 1991, 1993). For the magnetic properties of related compounds, see: Tran et al. (2008).

S2. Experimental

Terbium, lithium and tin, all with a nominal purity more than 99.9 wt. %, were used as starting elements. First, the pieces of the pure metals with a stoichiometry Tb₅₅Li₁₀Sn₃₅ were pressed into pellet, enclosed in tantalum crucible and placed in a resistance furnace with a thermocouple controller. Heating rate from room temperature to 670 K was equal 5 K per minute. At this temperature the alloy was held over 2 d and then the temperature was increased from 670 to 1070 K over 1 h. Then the alloy was annealed at this temperature for 8 h and slowly cooled down to room temperature. After the melting and annealing procedures, the total weight loss was less than 2%. Small good quality single-crystal of the title compound was isolated from alloy.

Computing details

Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell refinement: CrysAlis CCD (Oxford Diffraction, 2008); data reduction: CrysAlis RED (Oxford Diffraction, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures

	Fig. 1. The projection of the unit cell and coordination polyhedra of the atoms.
	Fig. 2. The distribution of tin and lithium atoms in three-dimensional-nets consisted of Tb atoms.

Pentaterbium lithium tristannide

Crystal data

Tb5LiSn3	Dx = 8.315 Mg m^−3
Mr = 1157.72	Mo Kα radiation, λ = 0.71073 Å
Hexagonal, P63/mcm	Cell parameters from 1907 reflections
Hall symbol: -P 6c 2	θ = 2.6–27.4°
a = 9.0122 (14) Å	µ = 45.56 mm^−1
c = 6.5744 (13) Å	T = 293 K
V = 462.4 (2) Å^3	Prism, metallic dark grey
Z = 2	0.07 × 0.05 × 0.03 mm
F(000) = 956

Data collection

Oxford Diffraction Xcalibur3 CCD diffractometer	216 independent reflections
Radiation source: fine-focus sealed tube	207 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.021
Detector resolution: 0 pixels mm^-1	θmax = 27.4°, θmin = 2.6°
ω scans	h = −11→11
Absorption correction: analytical (CrysAlis RED; Oxford Diffraction, 2008)	k = −11→11
Tmin = 0.322, Tmax = 0.657	l = 0→8
1907 measured reflections

Refinement

Refinement on F^2	0 restraints
Least-squares matrix: full	Primary atom site location: structure-invariant direct methods
R[F^2 > 2σ(F^2)] = 0.021	Secondary atom site location: difference Fourier map
wR(F^2) = 0.066	w = 1/[σ^2(Fo^2) + (0.0268P)^2 + 3.977P] where P = (Fo^2 + 2Fc^2)/3
S = 1.33	(Δ/σ)max < 0.001
216 reflections	Δρmax = 1.08 e Å^−3
14 parameters	Δρmin = −1.47 e Å^−3

Special details

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

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

	x	y	z	Uiso*/Ueq
Tb1	0.25088 (10)	0.0000	0.2500	0.0479 (3)
Tb2	0.3333	0.6667	0.0000	0.0535 (3)
Sn3	0.60694 (14)	0.0000	0.2500	0.0493 (4)
Li4	0.0000	0.0000	0.0000	0.055 (13)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Tb1	0.0478 (4)	0.0481 (5)	0.0479 (5)	0.0241 (3)	0.000	0.000
Tb2	0.0536 (4)	0.0536 (4)	0.0532 (6)	0.0268 (2)	0.000	0.000
Sn3	0.0491 (5)	0.0493 (7)	0.0496 (6)	0.0247 (4)	0.000	0.000
Li4	0.07 (2)	0.07 (2)	0.03 (2)	0.033 (11)	0.000	0.000

Geometric parameters (Å, º)

Tb1—Li4	2.7952 (8)	Tb2—Tb1^xii	3.8093 (7)
Tb1—Li4^i	2.7952 (8)	Tb2—Tb1^xi	3.8093 (7)
Tb1—Sn3^ii	3.1066 (11)	Tb2—Tb1^xiii	3.8093 (8)
Tb1—Sn3^iii	3.1066 (11)	Tb2—Tb1^ix	3.8093 (7)
Tb1—Sn3	3.2090 (16)	Sn3—Tb1^xvii	3.1066 (11)
Tb1—Sn3^iv	3.5281 (8)	Sn3—Tb1^xviii	3.1066 (11)
Tb1—Sn3^v	3.5281 (8)	Sn3—Tb2^vii	3.2247 (6)
Tb1—Tb2^vi	3.8093 (7)	Sn3—Tb2^vi	3.2247 (6)
Tb1—Tb2^vii	3.8093 (7)	Sn3—Tb2^ix	3.2247 (6)
Tb1—Tb2^viii	3.8093 (7)	Sn3—Tb2^viii	3.2247 (6)
Tb1—Tb2^ix	3.8093 (7)	Sn3—Tb1^iv	3.5281 (8)
Tb1—Tb1^x	3.9161 (17)	Sn3—Tb1^v	3.5281 (8)
Tb2—Sn3^xi	3.2247 (6)	Li4—Tb1^xix	2.7952 (8)
Tb2—Sn3^xii	3.2247 (6)	Li4—Tb1^xx	2.7952 (8)
Tb2—Sn3^xiii	3.2247 (6)	Li4—Tb1^xiii	2.7952 (8)
Tb2—Sn3^ix	3.2247 (6)	Li4—Tb1^x	2.7952 (8)
Tb2—Sn3^xiv	3.2247 (6)	Li4—Tb1^xiv	2.7952 (8)
Tb2—Sn3^iii	3.2247 (6)	Li4—Li4^i	3.2872 (6)
Tb2—Tb2^xv	3.2872 (6)	Li4—Li4^xxi	3.2872 (6)
Tb2—Tb2^xvi	3.2872 (6)
Li4—Tb1—Li4^i	72.03 (3)	Sn3^xiv—Tb2—Tb1^xii	144.94 (2)
Li4—Tb1—Sn3^ii	82.67 (2)	Sn3^iii—Tb2—Tb1^xii	123.785 (13)
Li4^i—Tb1—Sn3^ii	82.67 (2)	Tb2^xv—Tb2—Tb1^xii	64.439 (7)
Li4—Tb1—Sn3^iii	82.67 (2)	Tb2^xvi—Tb2—Tb1^xii	115.561 (7)
Li4^i—Tb1—Sn3^iii	82.67 (2)	Sn3^xi—Tb2—Tb1^xi	53.50 (2)
Sn3^ii—Tb1—Sn3^iii	161.86 (5)	Sn3^xii—Tb2—Tb1^xi	110.39 (2)
Li4—Tb1—Sn3	143.985 (13)	Sn3^xiii—Tb2—Tb1^xi	59.520 (16)
Li4^i—Tb1—Sn3	143.985 (13)	Sn3^ix—Tb2—Tb1^xi	51.60 (2)
Sn3^ii—Tb1—Sn3	99.07 (2)	Sn3^xiv—Tb2—Tb1^xi	123.785 (13)
Sn3^iii—Tb1—Sn3	99.07 (2)	Sn3^iii—Tb2—Tb1^xi	144.94 (2)
Li4—Tb1—Sn3^iv	147.31 (3)	Tb2^xv—Tb2—Tb1^xi	115.561 (7)
Li4^i—Tb1—Sn3^iv	75.28 (2)	Tb2^xvi—Tb2—Tb1^xi	64.439 (7)
Sn3^ii—Tb1—Sn3^iv	93.283 (5)	Tb1^xii—Tb2—Tb1^xi	63.16 (2)
Sn3^iii—Tb1—Sn3^iv	93.283 (5)	Sn3^xi—Tb2—Tb1^xiii	59.520 (16)
Sn3—Tb1—Sn3^iv	68.70 (3)	Sn3^xii—Tb2—Tb1^xiii	123.785 (13)
Li4—Tb1—Sn3^v	75.28 (2)	Sn3^xiii—Tb2—Tb1^xiii	53.50 (2)
Li4^i—Tb1—Sn3^v	147.31 (3)	Sn3^ix—Tb2—Tb1^xiii	144.94 (2)
Sn3^ii—Tb1—Sn3^v	93.283 (5)	Sn3^xiv—Tb2—Tb1^xiii	110.39 (2)
Sn3^iii—Tb1—Sn3^v	93.283 (5)	Sn3^iii—Tb2—Tb1^xiii	51.60 (2)
Sn3—Tb1—Sn3^v	68.70 (3)	Tb2^xv—Tb2—Tb1^xiii	64.439 (7)
Sn3^iv—Tb1—Sn3^v	137.41 (5)	Tb2^xvi—Tb2—Tb1^xiii	115.561 (7)
Li4—Tb1—Tb2^vi	102.887 (9)	Tb1^xii—Tb2—Tb1^xiii	102.753 (8)
Li4^i—Tb1—Tb2^vi	136.924 (8)	Tb1^xi—Tb2—Tb1^xiii	93.848 (16)
Sn3^ii—Tb1—Tb2^vi	54.444 (14)	Sn3^xi—Tb2—Tb1^ix	123.785 (13)
Sn3^iii—Tb1—Tb2^vi	140.12 (2)	Sn3^xii—Tb2—Tb1^ix	59.520 (16)
Sn3—Tb1—Tb2^vi	53.886 (12)	Sn3^xiii—Tb2—Tb1^ix	144.94 (2)
Sn3^iv—Tb1—Tb2^vi	100.83 (2)	Sn3^ix—Tb2—Tb1^ix	53.50 (2)
Sn3^v—Tb1—Tb2^vi	51.970 (13)	Sn3^xiv—Tb2—Tb1^ix	51.60 (2)
Li4—Tb1—Tb2^vii	136.924 (8)	Sn3^iii—Tb2—Tb1^ix	110.39 (2)
Li4^i—Tb1—Tb2^vii	102.887 (9)	Tb2^xv—Tb2—Tb1^ix	115.561 (7)
Sn3^ii—Tb1—Tb2^vii	140.12 (2)	Tb2^xvi—Tb2—Tb1^ix	64.439 (7)
Sn3^iii—Tb1—Tb2^vii	54.444 (14)	Tb1^xii—Tb2—Tb1^ix	93.848 (16)
Sn3—Tb1—Tb2^vii	53.886 (12)	Tb1^xi—Tb2—Tb1^ix	102.753 (8)
Sn3^iv—Tb1—Tb2^vii	51.970 (13)	Tb1^xiii—Tb2—Tb1^ix	160.55 (2)
Sn3^v—Tb1—Tb2^vii	100.83 (2)	Tb1^xvii—Sn3—Tb1^xviii	78.14 (5)
Tb2^vi—Tb1—Tb2^vii	107.77 (2)	Tb1^xvii—Sn3—Tb1	140.93 (2)
Li4—Tb1—Tb2^viii	136.924 (8)	Tb1^xviii—Sn3—Tb1	140.93 (2)
Li4^i—Tb1—Tb2^viii	102.887 (9)	Tb1^xvii—Sn3—Tb2^vii	73.951 (16)
Sn3^ii—Tb1—Tb2^viii	54.444 (14)	Tb1^xviii—Sn3—Tb2^vii	137.78 (3)
Sn3^iii—Tb1—Tb2^viii	140.12 (2)	Tb1—Sn3—Tb2^vii	72.61 (2)
Sn3—Tb1—Tb2^viii	53.886 (12)	Tb1^xvii—Sn3—Tb2^vi	137.78 (3)
Sn3^iv—Tb1—Tb2^viii	51.970 (13)	Tb1^xviii—Sn3—Tb2^vi	73.951 (16)
Sn3^v—Tb1—Tb2^viii	100.83 (2)	Tb1—Sn3—Tb2^vi	72.61 (2)
Tb2^vi—Tb1—Tb2^viii	51.122 (14)	Tb2^vii—Sn3—Tb2^vi	145.22 (4)
Tb2^vii—Tb1—Tb2^viii	86.152 (16)	Tb1^xvii—Sn3—Tb2^ix	73.951 (16)
Li4—Tb1—Tb2^ix	102.887 (9)	Tb1^xviii—Sn3—Tb2^ix	137.78 (3)
Li4^i—Tb1—Tb2^ix	136.924 (8)	Tb1—Sn3—Tb2^ix	72.61 (2)
Sn3^ii—Tb1—Tb2^ix	140.12 (2)	Tb2^vii—Sn3—Tb2^ix	61.287 (15)
Sn3^iii—Tb1—Tb2^ix	54.444 (14)	Tb2^vi—Sn3—Tb2^ix	107.56 (2)
Sn3—Tb1—Tb2^ix	53.886 (12)	Tb1^xvii—Sn3—Tb2^viii	137.78 (3)
Sn3^iv—Tb1—Tb2^ix	100.83 (2)	Tb1^xviii—Sn3—Tb2^viii	73.951 (16)
Sn3^v—Tb1—Tb2^ix	51.970 (13)	Tb1—Sn3—Tb2^viii	72.61 (2)
Tb2^vi—Tb1—Tb2^ix	86.152 (16)	Tb2^vii—Sn3—Tb2^viii	107.56 (2)
Tb2^vii—Tb1—Tb2^ix	51.122 (14)	Tb2^vi—Sn3—Tb2^viii	61.287 (15)
Tb2^viii—Tb1—Tb2^ix	107.77 (2)	Tb2^ix—Sn3—Tb2^viii	145.22 (4)
Li4—Tb1—Tb1^x	45.533 (9)	Tb1^xvii—Sn3—Tb1^iv	73.62 (2)
Li4^i—Tb1—Tb1^x	45.533 (9)	Tb1^xviii—Sn3—Tb1^iv	73.62 (2)
Sn3^ii—Tb1—Tb1^x	50.93 (2)	Tb1—Sn3—Tb1^iv	111.30 (3)
Sn3^iii—Tb1—Tb1^x	110.93 (2)	Tb2^vii—Sn3—Tb1^iv	68.510 (11)
Sn3—Tb1—Tb1^x	150.0	Tb2^vi—Sn3—Tb1^iv	125.693 (6)
Sn3^iv—Tb1—Tb1^x	108.33 (2)	Tb2^ix—Sn3—Tb1^iv	125.693 (6)
Sn3^v—Tb1—Tb1^x	108.33 (2)	Tb2^viii—Sn3—Tb1^iv	68.510 (11)
Tb2^vi—Tb1—Tb1^x	99.726 (11)	Tb1^xvii—Sn3—Tb1^v	73.62 (2)
Tb2^vii—Tb1—Tb1^x	148.420 (11)	Tb1^xviii—Sn3—Tb1^v	73.62 (2)
Tb2^viii—Tb1—Tb1^x	99.726 (11)	Tb1—Sn3—Tb1^v	111.30 (3)
Tb2^ix—Tb1—Tb1^x	148.420 (11)	Tb2^vii—Sn3—Tb1^v	125.693 (6)
Sn3^xi—Tb2—Sn3^xii	163.38 (4)	Tb2^vi—Sn3—Tb1^v	68.510 (11)
Sn3^xi—Tb2—Sn3^xiii	72.44 (2)	Tb2^ix—Sn3—Tb1^v	68.510 (11)
Sn3^xii—Tb2—Sn3^xiii	96.334 (10)	Tb2^viii—Sn3—Tb1^v	125.693 (6)
Sn3^xi—Tb2—Sn3^ix	96.334 (10)	Tb1^iv—Sn3—Tb1^v	137.41 (5)
Sn3^xii—Tb2—Sn3^ix	72.44 (2)	Tb1^xix—Li4—Tb1^xx	88.933 (19)
Sn3^xiii—Tb2—Sn3^ix	97.06 (4)	Tb1^xix—Li4—Tb1	91.067 (19)
Sn3^xi—Tb2—Sn3^xiv	96.334 (10)	Tb1^xx—Li4—Tb1	180.0
Sn3^xii—Tb2—Sn3^xiv	97.06 (4)	Tb1^xix—Li4—Tb1^xiii	180.0
Sn3^xiii—Tb2—Sn3^xiv	163.38 (4)	Tb1^xx—Li4—Tb1^xiii	91.067 (19)
Sn3^ix—Tb2—Sn3^xiv	96.334 (10)	Tb1—Li4—Tb1^xiii	88.933 (19)
Sn3^xi—Tb2—Sn3^iii	97.06 (4)	Tb1^xix—Li4—Tb1^x	91.067 (19)
Sn3^xii—Tb2—Sn3^iii	96.334 (10)	Tb1^xx—Li4—Tb1^x	91.067 (19)
Sn3^xiii—Tb2—Sn3^iii	96.334 (10)	Tb1—Li4—Tb1^x	88.933 (19)
Sn3^ix—Tb2—Sn3^iii	163.38 (4)	Tb1^xiii—Li4—Tb1^x	88.933 (19)
Sn3^xiv—Tb2—Sn3^iii	72.44 (2)	Tb1^xix—Li4—Tb1^xiv	88.933 (19)
Sn3^xi—Tb2—Tb2^xv	120.643 (7)	Tb1^xx—Li4—Tb1^xiv	88.933 (19)
Sn3^xii—Tb2—Tb2^xv	59.357 (8)	Tb1—Li4—Tb1^xiv	91.067 (19)
Sn3^xiii—Tb2—Tb2^xv	59.357 (7)	Tb1^xiii—Li4—Tb1^xiv	91.067 (19)
Sn3^ix—Tb2—Tb2^xv	120.643 (8)	Tb1^x—Li4—Tb1^xiv	180.00 (7)
Sn3^xiv—Tb2—Tb2^xv	120.643 (7)	Tb1^xix—Li4—Li4^i	126.015 (13)
Sn3^iii—Tb2—Tb2^xv	59.357 (7)	Tb1^xx—Li4—Li4^i	126.015 (13)
Sn3^xi—Tb2—Tb2^xvi	59.357 (7)	Tb1—Li4—Li4^i	53.985 (13)
Sn3^xii—Tb2—Tb2^xvi	120.643 (7)	Tb1^xiii—Li4—Li4^i	53.985 (13)
Sn3^xiii—Tb2—Tb2^xvi	120.643 (8)	Tb1^x—Li4—Li4^i	53.985 (13)
Sn3^ix—Tb2—Tb2^xvi	59.357 (8)	Tb1^xiv—Li4—Li4^i	126.015 (13)
Sn3^xiv—Tb2—Tb2^xvi	59.357 (7)	Tb1^xix—Li4—Li4^xxi	53.985 (13)
Sn3^iii—Tb2—Tb2^xvi	120.643 (7)	Tb1^xx—Li4—Li4^xxi	53.985 (13)
Tb2^xv—Tb2—Tb2^xvi	180.0	Tb1—Li4—Li4^xxi	126.015 (13)
Sn3^xi—Tb2—Tb1^xii	110.39 (2)	Tb1^xiii—Li4—Li4^xxi	126.015 (13)
Sn3^xii—Tb2—Tb1^xii	53.50 (2)	Tb1^x—Li4—Li4^xxi	126.015 (13)
Sn3^xiii—Tb2—Tb1^xii	51.60 (2)	Tb1^xiv—Li4—Li4^xxi	53.985 (13)
Sn3^ix—Tb2—Tb1^xii	59.520 (16)	Li4^i—Li4—Li4^xxi	180.0

Symmetry codes: (i) −x, −y, z+1/2; (ii) −y, x−y−1, z; (iii) −x+y+1, −x+1, z; (iv) −x+1, −y, −z+1; (v) −x+1, −y, −z; (vi) x, y−1, z; (vii) −x+1, −y+1, z+1/2; (viii) x, y−1, −z+1/2; (ix) −x+1, −y+1, −z; (x) −x+y, −x, z; (xi) y, −x+y+1, −z; (xii) x, y+1, z; (xiii) −y, x−y, z; (xiv) x−y, x, −z; (xv) x, y, −z+1/2; (xvi) x, y, −z−1/2; (xvii) −y+1, x−y, z; (xviii) −x+y+1, −x, z; (xix) y, −x+y, −z; (xx) −x, −y, −z; (xxi) −x, −y, z−1/2.

 

Footnotes

‡Also at: Institute of Chemistry, Environment Protection and Biotechnology, Jan Dlugosz University, al. Armii Krajowej 13/15, 42-200 Czestochowa, Poland.