Synthesis and Characterization of New Quaternary BorocarbidesRRh2B2C (R=Rare Earth)

✍ Scribed by Jinhua Ye; Toetsu Shishido; Takahiko Sasaki; Toshitsugu Takahashi; Kazuo Obara; Ryunosuke Note; Takehiko Matsumoto; Tsuguo Fukuda

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 320 KB
• Volume: 133
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7318

✦ Synopsis

Arc-melting syntheses of RRh 2 B 2 C were carried out for all lanthanide elements except promethium. X ray diffraction revealed that new compounds exist for R" "Y, La-Er (except Eu), and the stability of RRh 2 B 2 C decreases for the smaller lanthanide. The tetragonal a-axis of RRh 2 B 2 C was found to contract as R goes from La to Er. The c-axis, however, expands slightly. In accordance with the lattice parameter change, interatomic distances between Rh atoms decrease significantly from 2.7623 A s in LaRh 2 B 2 C to 2.6552 A s in ErRh 2 B 2 C. The reduced stability of the RRh 2 B 2 C phase for the smaller rare earth is explained by the change in the crystallographic parameters with the size of R.