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Secondary Au−Au and Sn−Sn Interactions in the Superstructure of YbAuSnMissing Link in the Series of KHg2 Superstructures
The stannide YbAuSn has been synthesized in quantitative yield by reacting the elements in sealed tantalum tubes in a high-frequency furnace. The structure was determined from single-crystal X-ray data: Imm2, a = 469.7(1) pm, b = 2191.2(4) pm, c = 812.7(1) pm, wR2 = 0.111, 2061 F 2 values, and 58 v...
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Published in: | Chemistry of materials 2001-11, Vol.13 (11), p.4019-4025 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | The stannide YbAuSn has been synthesized in quantitative yield by reacting the elements in sealed tantalum tubes in a high-frequency furnace. The structure was determined from single-crystal X-ray data: Imm2, a = 469.7(1) pm, b = 2191.2(4) pm, c = 812.7(1) pm, wR2 = 0.111, 2061 F 2 values, and 58 variables. It crystallizes with a pronounced KHg2 type subcell (a, 1/3b, c, Imma). In the superstructure the tripled b axis allows an ordered stacking of Au3Sn3 hexagons with weak gold−tin, gold−gold, and tin−tin interlayer bonding interactions. The determined stacking sequence − + − − + −, − + − − + − in YbAuSn realizes a so far missing sequence within a general ordering scheme of KHg2 type superstructures. The group−subgroup relation in going from the KHg2 subcell and chemical bonding in YbAuSn are discussed. Each ytterbium site has an ordered near-neighbor environment of six gold and six tin atoms in the form of two tilted hexagons. Magnetic susceptibility measurements show a nonmagnetic ground state of the ytterbium atoms. YbAuSn is a metallic conductor with a specific resistivity of 50 μΩ cm at room temperature. 119Sn Mössbauer spectroscopic data show one signal at an isomer shift of 1.922(5) mm/s subjected to quadrupole splitting of 0.929(9) mm/s. |
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ISSN: | 0897-4756 1520-5002 |
DOI: | 10.1021/cm011089q |