In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 62, No. 11 ( 2007-11-1), p. 1397-1406
Abstract:
New rare earth metal-rich indium compounds RE 3 T 2−x In x (RE = Gd, Tb, Dy, Ho, Er, Tm; T = Rh, Pd, Ir) were synthesized from the elements via high-frequency melting and subsequent annealing in sealed silica ampoules. These intermetallics crystallize with substitution variants of the tetragonal Y 3 Rh 2 -type structure, space group I4/mcm, Z = 28. All samples were studied by powder and single crystal X-ray diffraction: a = 1164.2(2), c = 2486.5(5) pm, for Tb 3 Rh 1.25 In 0.71 , a = 1139.4(2), c = 2480.8(5) pm for Er 3 Rh 1.48 In 0.52 , a = 1153.7(2), c = 2465.4(5) pm for Tm 3 Rh 1.25 In 0.71 , a = 1146.4(2), c = 2498.4(5) pm for Tb 3 Ir 1.62 In 0.33 , a = 1154.9(2), c = 2500.1(5) pm for Tb 3 Ir 1.52 In 0.44 , a = 1187.8(2), c = 2559.2(5) pm for Gd 3 Pd 1.27 In 0.71 , and a = 1169.1(2), c = 2530.3(5) pm for Ho 3 Pd 1.27 In 0.71 . The indium atoms show different site occupancies on the transition metal positions, and for most crystals small defects occur for one transition metal site. Gd 3 Rh 1.30 In 0.64 (a = 1166.3(2), c = 2512.0(5) pm) and Dy 3 Rh 1.31 In 0.64 reveal complete rhodium-indium ordering. These two indides crystallize with the translationengleiche subgroup I4/m. The rare earth atoms in these RE 3 T 2 − x In x indides have coordination numbers between 13 and 15. A striking structural motif is the tetrahedral indium coordination in the first coordination sphere of the RE5 position (305 pm Gd-In in Gd 3 Rh 1.30 In 0.64 ). The transition metal atoms show trigonal prismatic or square anti-prismatic rare earth coordination. In all compounds investigated, the indium atoms substitute these metals only at the square prismatic sites and at one site of coordination number 10. The crystal chemical consequences of the different ordered and statistical transition metal-indium substitutions are discussed
Type of Medium:
Online Resource
ISSN:
1865-7117
,
0932-0776
DOI:
10.1515/znb-2007-1108
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2007
detail.hit.zdb_id:
2078109-X
detail.hit.zdb_id:
124635-5
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