Magnetic Properties of Ordered Perovskites Ba2LnIrO6 (Ln=Sm, Eu, Gd, and Yb)

✍ Scribed by Makoto Wakeshima; Daijitsu Harada; Yukio Hinatsu; Nobuyuki Masaki

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 149 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8425

✦ Synopsis

Magnetic properties of ordered perovskites Ba 2 LnIrO 6 (Ln ‫؍‬ Sm, Eu, Gd, and Yb) are reported. Their magnetic susceptibilities were measured from 2 to 350 K. The 151 Eu MoK ssbauer spectrum of Ba 2 EuIrO 6 and the electronic paramagnetic resonance (EPR) spectrum of Ba 2 GdIrO 6 were measured at room temperature. Ba 2 EuIrO 6 and Ba 2 SmIrO 6 show Van Vleck paramagnetism. A spin+orbit coupling constant of the Eu 3؉ ion is determined to be 364 cm ؊1 . The MoK ssbauer spectrum of Ba 2 EuIrO 6 shows that the Eu ion is in the trivalent state, and the symmetry of the Eu site is slightly distorted from an octahedral symmetry because of the existence of a quadrupole interaction. The magnetic susceptibilities of Ba 2 GdIrO 6 and Ba 2 YbIrO 6 follow the Curie law and the crystal 5eld splitting of the Yb 3؉ ion is calculated. The g value of the Gd 3؉ ion in Ba 2 GdIrO 6 is determined to be 1.99 and Gd 3؉ is very slightly a4ected by the crystal 5eld from the EPR measurement.