Dy2AlGe2

inorganic papers

Acta Cryst.(2006). E62, i55–i57 doi:10.1107/S1600536806005320 Demchenkoet al. _Dy

2AlGe2

i55

Acta Crystallographica Section E

Structure Reports

Online

ISSN 1600-5368

Dy

2

AlGe

2

Grigorii Demchenko,aJoanna Kon´czyk,bPavlo Demchenko,a*

Volodymyr Kuprysyukaand

Roman Gladyshevskiia

a_{Department of Inorganic Chemistry, Ivan}

Franko National University of Lviv, Kyryla i Mefodiya St. 6, 79005 Lviv, Ukraine, and

b_{Institute of Chemistry and Environment}

Protection, Jan Dlugosz University, al. Armii Krajowej 13/15, 42-200 Czestochowa, Poland

Correspondence e-mail: [email protected]

Key indicators

Single-crystal X-ray study

T= 295 K

Mean(Ge–Ge) = 0.003 A˚

Rfactor = 0.042

wRfactor = 0.082

Data-to-parameter ratio = 20.7

For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.

Received 8 February 2006 Accepted 14 February 2006

#2006 International Union of Crystallography

All rights reserved

Single crystals of didysprosium aluminium digermanide were synthesized from the corresponding elements by arc-melting in the presence of Ni. The new intermetallic compound crystallizes in the space group P4/mbm and adopts the Mo2FeB2 structure type, with all three crystallographically

unique atoms in special positions of site symmetriesm.2m(Dy and Ge) and 4/m.. (Al). The coordination polyhedra around the metal atoms are distorted pentagonal (Dy), tetragonal (Al) and trigonal (Ge) prisms with 7, 4 and 3 additional capping atoms, respectively.

Comment

Ternary intermetallics of rare-earth metals with formulae

RE2T2XandRE2X02X(whereREis a rare earth metal,Tis a

transition metal, and X and X0 _{are p-block elements)}

crys-tallize mostly in two structure types, viz. the orthorhombic (space group Immm) W2CoB2type (Rieger et al., 1966) and

the tetragonal (space groupP4/mbm) Mo2FeB2type (Rieger

et al., 1964), the latter being a ternary ordered variant of the U3Si2type (Zachariasen, 1949). The distorted derivative of the

U3Si2type with unit-cell doubling along thecaxis is the Zr3Al2

structure type (space group P42/mnm) (Wilson & Spooner,

1960). The ternary ordered variants of the Zr3Al2type are the

U2Pt2Sn (Gravereauet al., 1994) and the Er2Au2Sn structure

types (Po¨ttgen, 1994). An extensive review dealing with intermetallic compounds with ordered U3Si2 or Zr3Al2-type

structures was published recently by Lukachuk & Po¨ttgen (2003). It should be noted that there are no aluminium germanidesRE2AlGe2of the Mo2FeB2type, while aluminium

silicidesRE2AlSi2andRE2Al2Si, as well as indium germanides

RE2InGe2, exist. However, Choeet al.(2002) found another

mode of atomic distribution for aluminium germanides that is realised in the new monoclinic structure type Gd2AlGe2.

Quite recently, Rodewaldet al.(2006) reported a new super-structure of the Mo2FeB2type,viz. a tetragonal phase (space

groupP4/m) with composition Er2.30Ni1.84In0.70.

The RE2T2X and RE2X02X phases have received special

attention for their outstanding physical properties. A precise determination of the crystal structure for phases of these compositions is a basic requirement for the better under-standing of their physical properties. During systematic investigation of the Dy–Al–Ge system (Kuprysyuk, 2005), it was established that the compound Dy2AlGe2forms neither as

a cast alloy nor when annealed at 873 K. The alloy with nominal composition Dy40Al20Ge40 was found to consist of

three different phases, namely of DyAlGe, Dy2AlGe3 and

Dy5Ge3. The new compound, namely Dy2AlGe2, was obtained

Ni—Al—Ge, and we present here the results of a single-crystal structure study.

Dy2AlGe2adopts the Mo2FeB2structure type (Riegeret al.,

1964). A clinographic projection of the unit cell is shown in Fig. 1. The coordination sphere around Dy (site symmetry

m.2m) consists of 17 atoms, if bonding interactions are considered for distances < 4.3 A˚ , resulting in a distorted pentagonal prism with seven additional capping atoms, [DyGe6Al4Dy7] (Fig. 2a). The bases of the prism have the

composition [Ge3Al2] and five additional Dy atoms cap the

faces of the prism, while two other Dy atoms cap the bases of the prism at a distance of 4.291 (3) A˚ . The coordination polyhedron for Ge (site symmetrym.2m; bonding interactions < 3.1 A˚ ) is a deformed (ratio height/width = 1.17)

triaug-mented trigonal prism [GeGeAl2Dy6] with two [Dy3] bases

and two Al and one Ge as capping atoms (Fig. 2b). The Al atom (site symmetry 4/m..; bonding interactions < 3.4 A˚ ) centres a tetragonal prism [AlGe4Dy8] with two [Dy4] bases

and four additional Ge as capping atoms (Fig. 2c). The structure of Dy2AlGe2adopts class #10 (coordination number

6 +nfor the smallest atom (n= 0–5), a trigonal prism and its derivatives as coordination polyhedron) according to the classification scheme of Krypyakevich (1977).

Dy2AlGe2belongs to the family of two-layer structures, like

more than 70 other inorganic structure types that are listed in the structure type compilation TYPIX (Parthe´ et al., 1993– 1994). The first layer atz= 0 consists of a pentagonal network [Ge2Al], and the second layer at z = 0.5 consists of a 43

2

43 network of Dy atoms (Fig. 3). The structure of Dy2AlGe2can

alternatively be described as an intergrowth of distorted CsCl and AlB2-related slabs of compositions DyAl and DyGe2,

respectively. However, slabs with exactly the same composi-tions and the same structures do not exist as binary phases.

The interatomic distances (Table 1) are in good agreement with the sums of the atomic radii (Emsley, 1991). The shortest distance with the highest deviation (96.5% of the sum of the atomic radii) is observed between Dy and Ge atoms, with a Dy—Ge distance of 2.896 (2) A˚ , which indicates partial covalent bonding.

Experimental

The single crystal used in this work was extracted from a cast alloy of nominal composition Dy25Ni25Al30Ge20, which was prepared by arc

inorganic papers

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Demchenkoet al. _Dy

[image:2.610.314.562.73.332.2]

2AlGe2 Acta Cryst.(2006). E62, i55–i57

Figure 1

A clinographic projection of the Dy2AlGe2unit cell, with displacement

[image:2.610.58.271.76.268.2]

ellipsoids drawn at the 95% probability level.

Figure 2

The coordination polyhedra around (a) the Dy atom, (b) the Ge atom and (c) the Al atoms. Key: Dy atoms are blue, Ge atoms are red and Al atoms are yellow.

Figure 3

The networks in the structure of Dy2AlGe2. The solid lines show the

pentagonal [Ge2Al] network atz= 0 and the dashed lines show the 43243

[image:2.610.68.269.315.532.2]

melting of the elements (purity for Ni, Al and Ge better than 99.9%, and 99.84% for Dy) in an electric arc furnace with a water-cooled copper bottom under an Ar atmosphere (Ti-getter). A preliminary crystal investigation was performed using Laue and rotation methods

(RKV-86 and RGNS-2 chambers, MoKradiation). The chemical

composition of the crystal was determined with an energy-dispersive X-ray spectrometer PV9800 using a standardless procedure. The results of the energy dispersive X-ray (EDX) analysis (in atomic %) are: Dy 39.06, Ni 0.39, Al 26.10, Ge 34.45, with a precision of 2%. These values are close to the composition obtained from the struc-tural refinement. No other impurities were found. According to the EDX spectra, the investigated single crystal contains a very small amount of Ni, close to the detection limit. We performed an X-ray powder analysis (‘DRON-4.13’ powder diffractometer) of the sample with nominal composition Dy40Ni6Ge34Al20, prepared as a cast alloy

and as an alloy annealed at 873 K. However, the phase Dy2AlGe2was

not detected. Therefore, we assume that the title compound forms only as single crystals, stabilized by very small amounts of Ni, or exists in a narrow temperature region.

Crystal data

Dy2AlGe2

Mr= 497.16

Tetragonal,P4=mbm a= 7.019 (3) A˚

c= 4.291 (3) A˚

V= 211.4 (2) A˚3

Z= 2

Dx= 7.809 Mg m3

MoKradiation Cell parameters from 706

reflections

= 4.8–33.2 = 48.99 mm1

T= 295 (2) K

Elongated prism, metallic light grey 0.130.050.03 mm

Data collection

Oxford Diffraction Xcalibur3 CCD diffractometer

!scans

Absorption correction: analytical (CrysAlis RED; Oxford Diffraction, 2005)

Tmin= 0.057,Tmax= 0.292

1833 measured reflections

248 independent reflections 238 reflections withI> 2(I)

Rint= 0.071 max= 33.2

h=10!10

k=10!9

l=6!3

Refinement

Refinement onF2

R[F2_{> 2(F}2_{)] = 0.042}

wR(F2_{) = 0.082}

S= 1.31 248 reflections 12 parameters

w= 1/[2_(F

o2) + (0.0073P)2

+ 11.6525P]

whereP= (Fo2+ 2Fc2)/3

(/)max< 0.001 max= 2.20 e A˚3 min=3.04 e A˚3

Extinction correction:SHELXL97

Extinction coefficient: 0.0029 (8)

Table 1

Selected bond lengths (A˚ ).

Dy—Gei 2.896 (2) Dy—Geii 3.0460 (16) Dy—Aliii 3.3605 (14) Dy—Dyiv 3.507 (2) Dy—Dyv 3.6578 (18) Ge—Gevi 2.531 (4) Ge—Alvii 2.7638 (16)

Symmetry codes: (i) xþ1;yþ1;zþ1; (ii) x1 2;yþ

1

2;z; (iii)

xþ1 2;yþ

1

2;zþ1; (iv) x;yþ1;zþ1; (v) xþ 1 2;yþ

1 2;z; (vi)

xþ1;y;z; (vii)xþ1;y;z.

Analysis of the systematic absences using the programABSEN

(McArdle, 1996) led to the extinction symbolP-b- and possible space groupsP4b2,P4bmand centrosymmetricP4/mbm. A statistical test

of the distribution of theEvalues, using the programE-STATSfrom theWinGXsystem (Farrugia, 1999), suggested that the structure is centrosymmetric with a probability of 70%. Taking into account some notes on choosing a centre of symmetry (Marsh, 1995), the structure solution and refinement were also performed in the non-centrosym-metric space groupsP4b2 andP4bm, and in space groupsP4/m(as a model of the Er2.30Ni1.84In0.70structure type),P42/mnm(as a model of

the ordered Zr3Al2structure type) andPbam(as a subgroup ofP4/

mbm). The structure refinement of Dy2AlGe2clearly indicates that

this phase crystallizes in the centrosymmetric space groupP4/mbm, since solution and refinements in the other space groups were less satisfactory and resulted in higherRfactors and atomic displacement parameters. Attempts to refine some variants of statistical atomic distribution in order to adjust the composition determined from EDX spectra, including incorporation of Ni, failed. The atomic coordinates

were standardized using the programSTRUCTURE_TIDY(Gelato

& Parthe´, 1987). The highest maximum residual electron density is 0.84 A˚ from Al and the deepest hole is 1.99 A˚ from Ge.

Data collection: CrysAlis CCD (Oxford Diffraction, 2004); cell

refinement:CrysAlis CCD; data reduction:CrysAlis RED (Oxford

Diffraction, 2005); program(s) used to solve structure:SHELXS97

(Sheldrick, 1997); program(s) used to refine structure:SHELXL97

(Sheldrick, 1997); molecular graphics: DIAMOND (Brandenburg,

1999); software used to prepare material for publication:

SHELXL97.

The authors are indebted to K. Nierzewski for performing the EDX analysis.

References

Brandenburg, K. (1999). DIAMOND. Version 2.1e. Crystal Impact GbR, Bonn, Germany.

Choe, W., McWhorter, S. & Miller, G. J. (2002).Z. Anorg. Allg. Chem.628, 1575–1580.

Emsley, J. (1991).The Elements, 2nd ed. Oxford: Clarendon Press. Farrugia, L. J. (1999).J. Appl. Cryst.32, 837–838.

Gelato, L. M. & Parthe´, E. (1987).J. Appl. Cryst.20, 139–143.

Gravereau, P., Mirambet, F., Chevalier, B., Weill, F., Fourne`s, L., Laffargue, D., Bourre´e, F. & Etourneau, J. (1994).J. Mater. Chem.4, 1893–1895. Krypyakevich, P. I. (1977). Structure Types of Intermetallic Compounds.

Moscow: Nauka. (In Russian.)

Kuprysyuk, V. (2005). PhD thesis, Maria Curie-Sklodowska University, Lublin, Poland.

Lukachuk, M. & Po¨ttgen, R. (2003).Z. Kristallogr.218, 767–787. Marsh, R. E. (1995).Acta Cryst.B51, 897–907.

McArdle, P. (1996).J. Appl. Cryst.29, 306.

Oxford Diffraction (2004).CrysAlis CCD. Version 1.170. Oxford Diffraction Ltd, Abingdon, Oxfordshire, England.

Oxford Diffraction (2005).CrysAlis RED. Version 1.171. Oxford Diffraction Ltd, Abingdon, Oxfordshire, England.

Parthe´, E., Gelato, L., Chabot, B., Penzo, M., Cenzual, K. & Gladyshevskii, R. (1993-1994).TYPIX-Standardized Data and Crystal Chemical Character-ization of Inorganic Structure Types, inGmelin Handbook of Inorganic and Organometallic Chemistry. Heidelberg, Berlin: Springer.

Po¨ttgen, R. (1994).Z. Naturforsch. Teil B,49, 1309–1313.

Rieger, W., Nowotny, H. & Benesovsky, F. (1964).Monatsh. Chem.95, 1502– 1503.

Rieger, W., Nowotny, H. & Benesovsky F. (1966).Monatsh. Chem.97, 378–382. Rodewald, U. C., Lukachuk, M., Heying, B. & Po¨ttgen, R. (2006).Monatsh.

Chem.137, 7–13.

Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Go¨ttingen, Germany.

Wilson, C. G. & Spooner, F. J. (1960).Acta Cryst.13, 358–359. Zachariasen, W. H. (1949).Acta Cryst.2, 94–99.

inorganic papers

Acta Cryst.(2006). E62, i55–i57 Demchenkoet al. _Dy

supporting information

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Acta Cryst. (2006). E62, i55–i57

supporting information

Acta Cryst. (2006). E62, i55–i57 [https://doi.org/10.1107/S1600536806005320]

Dy

2

AlGe

2

Grigorii Demchenko, Joanna Ko

ń

czyk, Pavlo Demchenko, Volodymyr Kuprysyuk and Roman

Gladyshevskii

Aluminium digermanium didysprosium

Crystal data

Dy2AlGe2

Mr = 497.16 Tetragonal, P4/mbm

Hall symbol: -P 4 2ab

a = 7.019 (3) Å

c = 4.291 (3) Å

V = 211.4 (2) Å3

Z = 2

F(000) = 418

Dx = 7.809 Mg m−3

Mo Kα radiation, λ = 0.71073 Å Cell parameters from 706 reflections

θ = 4.8–33.2°

µ = 48.99 mm−1

T = 295 K

Elongated prism, metallic light grey 0.13 × 0.05 × 0.03 mm

Data collection

Oxford Diffraction Xcalibur3 CCD diffractometer

Radiation source: fine-focus sealed tube Graphite monochromator

ω scans

Absorption correction: analytical

(CrysAlis RED; Oxford Diffraction, 2005)

Tmin = 0.057, Tmax = 0.292

1833 measured reflections 248 independent reflections 238 reflections with I > 2σ(I)

Rint = 0.071

θmax = 33.2°, θmin = 4.8°

h = −10→10

k = −10→9

l = −6→3

Refinement

Refinement on F2 Least-squares matrix: full

R[F2 _{> 2σ(F}2_{)] = 0.042}

wR(F2_{) = 0.082}

S = 1.31 248 reflections 12 parameters 0 restraints

Primary atom site location: structure-invariant direct methods

Secondary atom site location: difference Fourier map

w = 1/[σ2_(F

o2) + (0.0073P)2 + 11.6525P] where P = (Fo2 + 2Fc2)/3

(Δ/σ)max < 0.001 Δρmax = 2.20 e Å−3 Δρmin = −3.04 e Å−3

Extinction correction: SHELXL97, Fc*_{=kFc[1+0.001xFc}2_λ3_/sin(2θ)]-1/4 Extinction coefficient: 0.0029 (8)

Special details

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Acta Cryst. (2006). E62, i55–i57

Refinement. Refinement of F2 _{against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F}2_, conventional R-factors R are based on F, with F set to zero for negative F2_{. The threshold expression of F}2 _{> σ(F}2_{) 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 (Å2₎

x y z Uiso*/Ueq

Dy 0.17662 (8) 0.67662 (8) 0.5000 0.0102 (3)

Ge 0.6275 (2) 0.1275 (2) 0.0000 0.0123 (4)

Al 0.0000 0.0000 0.0000 0.0098 (13)

Atomic displacement parameters (Å2₎

U11 _U22 _U33 _U12 _U13 _U23

Dy 0.0104 (3) 0.0104 (3) 0.0099 (4) −0.0015 (3) 0.000 0.000 Ge 0.0124 (6) 0.0124 (6) 0.0121 (7) −0.0015 (7) 0.000 0.000

Al 0.010 (2) 0.010 (2) 0.010 (3) 0.000 0.000 0.000

Geometric parameters (Å, º)

Dy—Gei _{2.896 (2) Ge—Dy}i _{2.896 (2)}

Dy—Geii _{2.896 (2) Ge—Dy}ii _{2.896 (2)}

Dy—Geiii _{3.0460 (16) Ge—Dy}ix _{3.0460 (16)}

Dy—Geiv _{3.0460 (16) Ge—Dy}xvii _{3.0460 (16)}

Dy—Gev _{3.0460 (16) Ge—Dy}vii _{3.0460 (16)}

Dy—Gevi _{3.0460 (16) Ge—Dy}xiii _{3.0460 (16)}

Dy—Alvii _{3.3605 (14) Al—Ge}xiii _{2.7638 (16)}

Dy—Alviii _{3.3605 (14) Al—Ge}iii _{2.7638 (16)}

Dy—Alix _{3.3605 (14) Al—Ge}xv _{2.7638 (16)}

Dy—Alx _{3.3605 (14) Al—Ge}xviii _{2.7638 (16)}

Dy—Dyxi _{3.507 (2) Al—Dy}xiii _{3.3605 (14)}

Dy—Dyiv _{3.6578 (18) Al—Dy}iii _{3.3605 (14)}

Dy—Dyxii _{3.6578 (18) Al—Dy}xix _{3.3605 (14)}

Dy—Dyxiii _{3.6578 (18) Al—Dy}xi _{3.3605 (14)}

Dy—Dyxiv _{3.6578 (18) Al—Dy}xvii _{3.3605 (14)}

Ge—Gexv _{2.531 (4) Al—Dy}vi _{3.3605 (14)}

Ge—Alxvi _{2.7638 (16) Al—Dy}xx _{3.3605 (14)}

Ge—Alix _{2.7638 (16) Al—Dy}xxi _{3.3605 (14)}

Gei_—Dy—Geii _{95.62 (8) Dy}xiii_—Dy—Dyxiv _{122.72 (4)} Gei_—Dy—Geiii _{155.29 (3) Ge}xv_—Ge—Alxvi _{116.11 (4)} Geii_—Dy—Geiii _{82.23 (5) Ge}xv_—Ge—Alix _{116.11 (4)} Gei_—Dy—Geiv _{155.29 (3) Al}xvi_—Ge—Alix _{127.78 (8)}

Geii_—Dy—Geiv _{82.23 (5) Ge}xv_—Ge—Dyi _{132.19 (4)}

Geiii_—Dy—Geiv _{49.09 (7) Al}xvi_—Ge—Dyi _{72.81 (4)}

Gei_—Dy—Gev _{82.23 (5) Al}ix_—Ge—Dyi _{72.81 (4)}

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Acta Cryst. (2006). E62, i55–i57

Geiii_—Dy—Gev _{109.72 (5) Al}xvi_—Ge—Dyii _{72.81 (4)}

Geiv_—Dy—Gev _{89.56 (6) Al}ix_—Ge—Dyii _{72.81 (4)}

Gei_—Dy—Gevi _{82.23 (5) Dy}i_—Ge—Dyii _{95.62 (8)}

Geii_—Dy—Gevi _{155.29 (3) Ge}xv_—Ge—Dyix _{65.46 (4)} Geiii_—Dy—Gevi _{89.56 (6) Al}xvi_—Ge—Dyix _{70.487 (15)} Geiv_—Dy—Gevi _{109.72 (5) Al}ix_—Ge—Dyix _{134.40 (3)}

Gev_—Dy—Gevi _{49.09 (7) Dy}i_—Ge—Dyix _{143.21 (4)}

Gei_—Dy—Alvii _{51.79 (2) Dy}ii_—Ge—Dyix _{75.94 (4)}

Geii_—Dy—Alvii _{109.11 (4) Ge}xv_—Ge—Dyxvii _{65.46 (4)} Geiii_—Dy—Alvii _{105.53 (5) Al}xvi_—Ge—Dyxvii _{134.40 (3)} Geiv_—Dy—Alvii _{151.79 (4) Al}ix_—Ge—Dyxvii _{70.487 (15)} Gev_—Dy—Alvii _{88.96 (5) Dy}i_—Ge—Dyxvii _{143.21 (4)} Gevi_—Dy—Alvii _{50.82 (3) Dy}ii_—Ge—Dyxvii _{75.94 (4)} Gei_—Dy—Alviii _{51.79 (2) Dy}ix_—Ge—Dyxvii _{70.28 (5)} Geii_—Dy—Alviii _{109.11 (4) Ge}xv_—Ge—Dyvii _{65.46 (4)} Geiii_—Dy—Alviii _{151.79 (4) Al}xvi_—Ge—Dyvii _{70.487 (15)} Geiv_—Dy—Alviii _{105.53 (5) Al}ix_—Ge—Dyvii _{134.40 (3)} Gev_—Dy—Alviii _{50.82 (3) Dy}i_—Ge—Dyvii _{75.94 (4)} Gevi_—Dy—Alviii _{88.96 (5) Dy}ii_—Ge—Dyvii _{143.21 (4)} Alvii_—Dy—Alviii _{95.21 (4) Dy}ix_—Ge—Dyvii _{89.56 (6)} Gei_—Dy—Alix _{109.11 (4) Dy}xvii_—Ge—Dyvii _{130.91 (7)} Geii_—Dy—Alix _{51.79 (2) Ge}xv_—Ge—Dyxiii _{65.46 (4)} Geiii_—Dy—Alix _{50.82 (3) Al}xvi_—Ge—Dyxiii _{134.40 (3)} Geiv_—Dy—Alix _{88.96 (5) Al}ix_—Ge—Dyxiii _{70.487 (15)} Gev_—Dy—Alix _{151.79 (4) Dy}i_—Ge—Dyxiii _{75.94 (4)} Gevi_—Dy—Alix _{105.53 (5) Dy}ii_—Ge—Dyxiii _{143.21 (4)} Alvii_—Dy—Alix _{79.35 (5) Dy}ix_—Ge—Dyxiii _{130.91 (7)} Alviii_—Dy—Alix _{154.96 (3) Dy}xvii_—Ge—Dyxiii _{89.56 (6)} Gei_—Dy—Alx _{109.11 (4) Dy}vii_—Ge—Dyxiii _{70.28 (5)} Geii_—Dy—Alx _{51.79 (2) Ge}xiii_—Al—Geiii _{180.00 (8)}

Geiii_—Dy—Alx _{88.96 (5) Ge}xiii_—Al—Gexv _90.0

Geiv_—Dy—Alx _{50.82 (3) Ge}iii_—Al—Gexv _90.0

Gev_—Dy—Alx _{105.53 (5) Ge}xiii_—Al—Gexviii _90.0 Gevi_—Dy—Alx _{151.79 (4) Ge}iii_—Al—Gexviii _90.0 Alvii_—Dy—Alx _{154.96 (3) Ge}xv_—Al—Gexviii _{180.00 (4)} Alviii_—Dy—Alx _{79.35 (5) Ge}xiii_—Al—Dyxiii _{124.59 (3)} Alix_—Dy—Alx _{95.21 (4) Ge}iii_—Al—Dyxiii _{55.41 (3)} Gei_—Dy—Dyxi _{132.19 (4) Ge}xv_—Al—Dyxiii _{58.69 (3)} Geii_—Dy—Dyxi _{132.19 (4) Ge}xviii_—Al—Dyxiii _{121.31 (3)} Geiii_—Dy—Dyxi _{54.86 (2) Ge}xiii_—Al—Dyiii _{55.41 (3)} Geiv_—Dy—Dyxi _{54.86 (2) Ge}iii_—Al—Dyiii _{124.59 (3)}

Gev_—Dy—Dyxi _{54.86 (2) Ge}xv_—Al—Dyiii _{121.31 (3)}

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Acta Cryst. (2006). E62, i55–i57

Geii_—Dy—Dyiv _{53.88 (4) Dy}xiii_—Al—Dyxix _{114.06 (3)} Geiii_—Dy—Dyiv _{134.77 (3) Dy}iii_—Al—Dyxix _{65.94 (3)} Geiv_—Dy—Dyiv _{107.82 (3) Ge}xiii_—Al—Dyxi _{121.31 (3)} Gev_—Dy—Dyiv _{107.82 (3) Ge}iii_—Al—Dyxi _{58.69 (3)} Gevi_—Dy—Dyiv _{134.77 (3) Ge}xv_—Al—Dyxi _{124.59 (3)} Alvii_—Dy—Dyiv _{99.42 (3) Ge}xviii_—Al—Dyxi _{55.41 (3)} Alviii_—Dy—Dyiv _{57.028 (13) Dy}xiii_—Al—Dyxi _{65.94 (3)} Alix_—Dy—Dyiv _{99.42 (3) Dy}iii_—Al—Dyxi _{114.06 (3)} Alx_—Dy—Dyiv _{57.028 (13) Dy}xix_—Al—Dyxi _{180.000 (19)} Dyxi_—Dy—Dyiv _{151.358 (18) Ge}xiii_—Al—Dyxvii _{124.59 (3)} Gei_—Dy—Dyxii _{53.88 (4) Ge}iii_—Al—Dyxvii _{55.41 (3)} Geii_—Dy—Dyxii _{53.88 (4) Ge}xv_—Al—Dyxvii _{58.69 (3)} Geiii_—Dy—Dyxii _{107.82 (3) Ge}xviii_—Al—Dyxvii _{121.31 (3)} Geiv_—Dy—Dyxii _{134.77 (3) Dy}xiii_—Al—Dyxvii _{79.35 (5)} Gev_—Dy—Dyxii _{134.77 (3) Dy}iii_—Al—Dyxvii _{100.65 (5)} Gevi_—Dy—Dyxii _{107.82 (3) Dy}xix_—Al—Dyxvii _{65.94 (3)} Alvii_—Dy—Dyxii _{57.028 (13) Dy}xi_—Al—Dyxvii _{114.06 (3)} Alviii_—Dy—Dyxii _{99.42 (3) Ge}xiii_—Al—Dyvi _{55.41 (3)} Alix_—Dy—Dyxii _{57.028 (13) Ge}iii_—Al—Dyvi _{124.59 (3)}

Alx_—Dy—Dyxii _{99.42 (3) Ge}xv_—Al—Dyvi _{121.31 (3)}

Dyxi_—Dy—Dyxii _{151.358 (18) Ge}xviii_—Al—Dyvi _{58.69 (3)} Dyiv_—Dy—Dyxii _{57.28 (4) Dy}xiii_—Al—Dyvi _{100.65 (5)} Gei_—Dy—Dyxiii _{108.780 (16) Dy}iii_—Al—Dyvi _{79.35 (5)} Geii_—Dy—Dyxiii _{108.780 (16) Dy}xix_—Al—Dyvi _{114.06 (3)} Geiii_—Dy—Dyxiii _{50.17 (4) Dy}xi_—Al—Dyvi _{65.94 (3)} Geiv_—Dy—Dyxiii _{95.09 (4) Dy}xvii_—Al—Dyvi _{180.000 (4)} Gev_—Dy—Dyxiii _{95.09 (4) Ge}xiii_—Al—Dyxx _{121.31 (3)} Gevi_—Dy—Dyxiii _{50.17 (4) Ge}iii_—Al—Dyxx _{58.69 (3)} Alvii_—Dy—Dyxiii _{57.028 (13) Ge}xv_—Al—Dyxx _{124.59 (3)} Alviii_—Dy—Dyxiii _{138.77 (3) Ge}xviii_—Al—Dyxx _{55.41 (3)} Alix_—Dy—Dyxiii _{57.028 (13) Dy}xiii_—Al—Dyxx _{114.06 (3)} Alx_—Dy—Dyxiii _{138.77 (3) Dy}iii_—Al—Dyxx _{65.94 (3)} Dyxi_—Dy—Dyxiii _{61.358 (18) Dy}xix_—Al—Dyxx _{100.65 (5)} Dyiv_—Dy—Dyxiii _{147.28 (4) Dy}xi_—Al—Dyxx _{79.35 (5)}

Dyxii_—Dy—Dyxiii _{90.0 Dy}xvii_—Al—Dyxx _{65.94 (3)}

supporting information

sup-5

Acta Cryst. (2006). E62, i55–i57

Dyiv_—Dy—Dyxiv _{90.0 Dy}xx_—Al—Dyxxi _{180.000 (4)}

Dyxii_—Dy—Dyxiv _{147.28 (4)}