• Subotić, Nikola
• Kadowaki, Kazuo
• Kashiwagi, Takanari
• Matsushita, Yoshitaka
• Mochiku, Takashi

Abstract

<jats:p>RhPb<jats:sub>2</jats:sub> (rhodium dilead) is a superconductor crystallizing in the CuAl<jats:sub>2</jats:sub> structure type (space group <jats:italic>I</jats:italic>4/<jats:italic>mcm</jats:italic>). The Rh and Pb atoms are located at the 4<jats:italic>a</jats:italic> (site symmetry 422) and 8<jats:italic>h</jats:italic> (<jats:italic>m</jats:italic>.2<jats:italic>m</jats:italic>) sites, respectively. The crystal structure is composed of [RhPb<jats:sub>8</jats:sub>] antiprisms, which share their square faces along the <jats:italic>c</jats:italic> axis and the edges in the direction perpendicular to the <jats:italic>c</jats:italic> axis. We have succeeded in growing single crystals of RhPb<jats:sub>2</jats:sub> and have re-determined the crystal structure on basis of single-crystal X-ray diffraction data. In comparison with the previous structure studies using powder X-ray diffraction data [Wallbaum (1943). <jats:italic>Z. Metallkd</jats:italic>. <jats:bold>35</jats:bold>, 218–221; Havinga <jats:italic>et al.</jats:italic> (1972). <jats:italic>J. Less-Common Met.</jats:italic><jats:bold>27</jats:bold>, 169–186], the current structure analysis of RhPb<jats:sub>2</jats:sub> leads to more precise unit-cell parameters and fractional coordinates, together with anisotropic displacement parameters for the two atoms. In addition and likewise different from the previous studies, we have found a slight deficiency of Rh in RhPb<jats:sub>2</jats:sub>, leading to a refined formula of Rh<jats:sub>0.950 (9)</jats:sub>Pb<jats:sub>2</jats:sub>.</jats:p>

Topics

• impedance spectroscopy
• single crystal
• Rhodium
• laser emission spectroscopy
• anisotropic
• powder X-ray diffraction
• space group