Low- and high-temperature structures of YbCuBi

✍ Scribed by Tkachuk, Andriy V.; Mozharivskyj, Yurij; Mar, Arthur

• Book ID: 120650200
• Publisher: Oldenbourg Wissenschaftsverlag
• Year: 2006
• Tongue: English
• Weight: 116 KB
• Volume: 221
• Category: Article
• ISSN: 2194-4946
• DOI: 10.1524/zkri.2006.221.5-7.539

✦ Synopsis

Abstract

A variable temperature single-crystal X-ray diffraction study was undertaken on the intermetallic compound YbCuBi, which undergoes a phase transition at ∼375 K. At low temperatures (T = 193 K, a = 4.5821(3) Å, c = 7.8107(8) Å; T = 295 K, a = 4.5825(6) Å, c = 7.8597(10) Å), YbCuBi adopts the LiGaGe-type (ordered CaIn~2~-type) structure (Pearson symbol __hP__6, space group __P__6~3~
mc, Z = 2). At high temperatures (T = 393 K, a = 4.5885(14) Å, c = 7.913(2) Å; T = 473 K, a = 4.594(4) Å, c = 7.928(6) Å), YbCuBi adopts the ZrBeSi-type (ordered Ni~2~In-type) structure (Pearson symbol __hP__6, space group __P__6~3~/mmc, Z = 2). The structure consists of Yb atoms separating hexagonal ~∞~
^2^[CuBi] nets, which are buckled at low temperatures but planar at high temperatures.