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Ternary Rare Earth (R) Transition Metal Aluminides R3T4Al12 (T = Ru and Os) with Gd3Ru4Al12 Type Structure

✍ Scribed by Jens Niermann; Wolfgang Jeitschko

Publisher
John Wiley and Sons
Year
2002
Tongue
German
Weight
183 KB
Volume
628
Category
Article
ISSN
0372-7874

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✦ Synopsis

The isotypic intermetallic compounds R 3 Ru 4 Al 12 (R Ο­ Y, Pr, Nd, Sm, GdΟͺTm) and R 3 Os 4 Al 12 (R Ο­ Y, CeΟͺNd, Sm, GdΟͺTm) were prepared by reaction of the elemental components in an arc-melting furnace. Their crystal structure was determined from four-circle X-ray diffractometer data of Y 3 Ru 4 Al 12 : P6 3 /mmc, a Ο­ 877.7(1) pm, c Ο­ 952.3(1) pm, Z Ο­ 2, R Ο­ 0.028 for 361 structure factors and 28 variable parameters. It was also refined for Nd 3 Os 4 Al 12 (a Ο­ 889.2(1) pm, c Ο­ 960.3(1) pm, R Ο­ 0.021 for 425 F values and 30 variables) and Gd 3 Os 4 Al 12 (a Ο­ 884.7(1) pm, c Ο­ 955.3(2) pm, R Ο­ 0.020; 427 F values, 30 variables). The refinements of the occupancy parameters revealed mixed T/Al occupancy for some of the aluminum sites resulting in the compositions Y 3 Ru 4.060(3) Al 11.940(3) , Nd 3 Os 4.43(1) Al 11.57(1) , and Gd 3 Os 4.44(1) -Al 11.56(1) , respectively. The structure is related to those found for Y

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