Magnetic Properties of the RCo4B Compounds (R=Y, Pr, Nd, Sm, Gd, Tb)

✍ Scribed by Cyril Chacon; Olivier Isnard

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 155 KB
• Volume: 154
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8843

✦ Synopsis

The RCo 4 B (R ‫؍‬ rare earth) compounds crystallize with the CeCo 4 B-type structure. They are obtained by an ordered substitution of cobalt by boron in every second layer of the CaCu 5 structure. We report on a study of the structural and magnetic properties of the RCo 4 B with di4erent rare-earth elements (R ‫؍‬ Y, Pr, Nd, Sm, Gd, Tb). The c lattice parameter of the hexagonal structure remains almost constant, while the a parameter goes up when the atomic radius of the rare-earth element increases. The compounds with R ‫؍‬ Y, Pr, and Nd are ferromagnetically ordered, whereas the compounds with Gd and Tb are ferrimagnetic. We also present the evolution of the easy magnetization direction depending on R at room temperature. The ordering temperatures are presented and the saturation magnetization at both temperatures 5 and 300 K are discussed for each compound.