Crystal structure of europium dirhodium digermanium, EuRh₂Ge₂ with ThCr₂Si₂ type

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Reference

Crystal structure of europium dirhodium digermanium, EuRh

Ge

with ThCr

Si

type

GLADYSHEVSKII, Roman, PARTHE, Erwin

GLADYSHEVSKII, Roman, PARTHE, Erwin. Crystal structure of europium dirhodium

digermanium, EuRh

Ge

with ThCr

Si

type. Zeitschrift für Kristallographie - Crystalline Materials , 1992, vol. 198, no. 1-4, p. 173-174

DOI : 10.1524/zkri.1992.198.14.173

Available at:

http://archive-ouverte.unige.ch/unige:99963

Disclaimer: layout of this document may differ from the published version.

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Zeitschrift für

Kristatlographie 198,

(1992)

© by

Oldenbourg Verlag,

-

0044-2968/92

Crystal ^{structure of} europium ^dirhodium digermanium, ^{EuRh2Ge2 with} ThCr2Si2 type

R. E.

Gladyshevskii ^and

^Parthé

Laboratoire de

Cristallographie

Rayons X,

Geneve,

quai

Ansermet,

4,

(Received April ^19, 1991)

Source of material: Synthesis from the elements by

melting ^and

nealing

800° C. in evacuated quartz ^tubes.

EuRh2Ge2 crystallizes ^{in the} ThCr2Si2

CeGa2Al2 type. ^{The structural} features of this

type ^{have been described} in the literature

(see ^ref. 1).

Tetragonal, I4/mmm (no 139),

4.1591(7),

10.585(2) A, ^V

183.10(7) A3,

2,

^0.037.

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174

Gladyshevskii

Table 1. Parametersused for the

X-ray

type:

Wave

length:

Crystal

Temperature

measurement:

26

Philips

Ka

(07107 A)

metallic

plate,

.040 x.040 x.012^mm 293 K

60

Number of

unique

reflections:

Criterion for unob-

Fc

3<t(Fq)

served reflections:

Number of refined 9

parameters:

Scan mode: co-20

u: 414.42

cm"1

Structure solution XTAL3.0 program used:

Table 2.Final atomic coordinates and

displacement

(in A2)

Atom x y ^z IWUn U22 U33 U12 U13 U23

Ge 0.0 0.0 0.3703(4) 0.004(1) 0.004(1) 0.013(2) ^{0.0 0.0 0.0}

Rh 0.0 0.5 0.25 0.003(1) 0.003(1) 0.013(1) 0.0 0.0 0.0

En 0.0 0.0 0.0 0.005(1) 0.005(1) 0.014(1) ^{0.0 0.0 0.0}

Further details of thestructuredetermination

(e.g.

factors)

deposited

the relevant database and can be accessed as Collection No.370007 or ordered from the Fachinformationszentrum

Karlsruhe,

Eggenstein-Leopoldshafen.

References:

1.

Parthé,

Chabot, B., Braun, H.F., Engel,

Ternary BaAl4

—

typederivativestructures.

Acta

Cryst.

(1983)

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