The crystal structure of the ternary alloy <i>c</i>-Al<sub>68</sub>Pd<sub>20</sub>Ru<sub>12</sub>

Zeitschrift fur Kristallographie - Crystalline Materials - Tập 211 Số 1 - Trang 17-24 - 1996
Stefan Mahne, Walter Steurer

Tóm tắt

Abstract The crystal structure of cubic Al68Pd20Ru12 was investigated by means of single crystal X-ray structure analysis: space group P23 (No. 195), a = 15.540(2) Å, V = 3753(1) Å3, Pearson symbol cP296–46.85. The chemical composition was determined by microprobe analysis: Al68Pd20Ru12, M r = 6316, Z = 2, D calc = 5.59 Mg m−3; MoKα , refined as Al87Pd38, F(000) = 5758, μ = 9.89 mm−1, R(wR) = 0.056(0.052) for 1289 reflections with F > 3σ(F) and 133 variables, goodness of fit S = 2.21. The structure contains 35 different orbits. Body centred pseudo symmetry is broken by the distribution of atoms, the non-centrosymmetric point symmetry 23 of this structure is close to m[unk] in space group Pn[unk]. Disorder of Al atoms is observed at a number of positions. Interatomic distances cover the ranges of 2.98 Å to 3.20 Å, 2.43 Å to 3.12 Å and 2.54 Å to 3.66 Å, for contacts TM–TM, Al–TM and Al–Al, respectively (TM: transition metal). The coordination shells contain triangular and/or quadrangular faces forming icosahedra, rhombic dodecahedra or respective combinations of these two basic forms. Links to cubic approximants of icosahedral phases are shown and relationships to neighboring crystalline and decagonal phases are discussed.

Từ khóa


Tài liệu tham khảo

10.1016/0921-4526(88)90039-7

Brunner G. O., 1971, Kristallstrukturen. Z. Kristallogr., 133, 127, 10.1524/zkri.1971.133.133.127

10.1107/S0108768193013989

10.1103/PhysRevB.38.1638

10.1107/S0365110X67004372

10.1107/S0365110X6600149X

Daams J., 1988, Z. Kristallogr., 185, 714

10.1016/0925-8388(92)90570-Y

10.3891/acta.chem.scand.19-2124

10.3891/acta.chem.scand.20-0427

10.3891/acta.chem.scand.22-2374

10.1016/0022-5088(82)90048-0

10.1007/BF02664249

10.1016/0925-8388(93)90505-H

Janot, 1989, Phys.-Condens. Mat., 1, 1048, 10.1088/0953-8984/1/6/001

Mahne S., 1995, Z. Kristallogr. Supplement Issue, 9, 122

Matsuo Y., Philos. Mag. Lett., 70, 155, 10.1080/09500839408240969

10.1107/S0108767392011930

10.1107/S0108768193008729

10.1107/S0108768188010481

10.4028/www.scientific.net/MSF.150-151.15

10.1080/09500839108214684

Tsai A. P., 1993, Mater. Trans., 34, 155, 10.2320/matertrans1989.34.155

10.1080/09500839208215144

Thông tin
Thông tin xuất bản

Zeitschrift fur Kristallographie - Crystalline Materials

Tập 211 Số 1

17-24

Thông tin tác giả