Structure study of superconducting Li2Pd3B system by neutron powder diffraction

✍ Scribed by T. Mochiku; H. Takeya; T. Wuernisha; K. Mori; T. Ishigaki; T. Kamiyama; H. Fujii; K. Hirata

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 239 KB
• Volume: 445-448
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2006.03.077

✦ Synopsis

The crystal structure of the superconducting boride Li 2 Pd 3 B has been refined by Rietveld analysis of time-of-flight neutron powder diffraction data at room temperature. This compound exhibits superconductivity at 8 K, and X-ray diffraction study shows that this compound has a cubic structure with the distorted BPd 6 octahedron. The neutron powder diffraction study revealed that there was no deficiency and no anomaly in the atomic displacement parameters of the Li and B sites. The Li partial structure is rigid, and the distorted BPd 6 octahedron exists at the clearance gap of the Li partial structure. The Li 2 Pt 3 B compound substituted of Pt for Pd has larger distortion of the BPt 6 octahedron than that of the BPd 6 octahedron, which affects the decrease of the superconducting transition temperature.