Crystal structure of ytterbium nickel dialuminium, YbNiAl<sub>2</sub> with MgCuAl<sub>2</sub> type

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Reference

Crystal structure of ytterbium nickel dialuminium, YbNiAl

₂

with MgCuAl

₂

type

GLADYSHEVSKII, Roman, PARTHE, Erwin

GLADYSHEVSKII, Roman, PARTHE, Erwin. Crystal structure of ytterbium nickel dialuminium, YbNiAl

₂

with MgCuAl

₂

type. Zeitschrift für Kristallographie , 1992, vol. 199, no. 1-4, p.

316-317

DOI : 10.1524/zkri.1992.199.14.316

Available at:

http://archive-ouverte.unige.ch/unige:104772

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

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Zeitschrift für Kristallographie 199, 316 - 317 (1992)

Crystal structure of ytterbium nickel dialuminium, YbNiAlz with MgCuAlj type

R.E. Gladyshevskii and E. Parthe

Laboratoire de Cristallographie aux Rayons X, Universite de Geneve, 24 quai Emest- Ansermet, CH-1211 Geneva 4, Switzerland

(Received September 3,1991)

HEIGHT O 1/2

- o o

AI \ »

o

Ni O O

Source of material: Synthesis from the Clements by arc melting.

YbNiAlz crystallizes in the MgCuAlz type, a substitution derivative of the RcßB type (see ref. 1). The Yb and Ni atoms are in the centers of pentagonal and trigonal prisms, respectively.

Orthorhombic, Cmcm (no 63), a = 4.0402(5), b = 9.889(1), c = 6.824(2) Ä, V = 272.64(9) Ä ^ Z = 4, R« = 0.035.

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Ytterbium nickel dialuminiutn 317

Table 1. Parameters used for the X-ray data collection

DifTractometer Number of unique

type: Philips PWllOO reflections: 215

Wave length: Mo K, radiation Criterion for unob-

(0.7107 Ä) served reflections: F„<3ff(F,) Crystal character- metallic needle, size Number of reßned

istics: .064 X.032 X.032 m m Parameters: 15

Temperature of Scan mode: (0-20

measurement: 293 K Ii: 398.35 c m - '

60° Stnicture Solution

program used: XTAL3.0

Table 2. Final atomic coordinates and displacement parameters (in A^)

Atom X y ^z U t o / U i , U , 3 U | , U „

AI 0.0 0.1310(6) 0.0S4(1) 0.006(3) 0.013(3) 0.008(3) 0.0 0.0 0.002(2)

Yb 0.0 0.4359(1) 0.25 0.0121(6) 0.007«(5) 0.0057(6) 0.0 0.0 0.0

Ni 0.0 0.7144(3) 0.25 0.010(2) 0.011(2) 0.005(2) 0.0 0.0 0.0

Further details of the stnictuie determination (e.g. stnicture Factors) have been deposited within the relevant database and can be accessed as Collection No. 370014 or ordered from the Fachinformationszentrum Karlsruhe, D-7514 Eggenstein-Leopoldshafen.

References:

Rykhal', R.M., Zarechnyuk, O.S., Yarmolyuk, Ya.P.: Crystal structtire of the Compounds YNiAU and YNiAU- Sov. Phys. Crystallogr. 17 (1972) 453 - 4 5 5 .

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