Magnetic Properties of Layered Perovskites NaLnTiO4(Ln=Sm, Eu, and Gd)

✍ Scribed by Keitaro Tezuka; Yukio Hinatsu; Nobuyuki M. Masaki; Masakatsu Saeki

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 317 KB
• Volume: 138
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7794

✦ Synopsis

The magnetic properties of the layered perovskite compounds NaLnTiO 4 (Ln ‫؍‬ Sm, Eu, and Gd) are reported. Their dc susceptibilities were measured from 4.5 to 320 K. The Mo¨ssbauer spectrum of 151 Eu and the electron paramagnetic resonance (EPR) spectrum of Gd 3؉ were also measured at room temperature. NaEuTiO 4 shows Van Vleck paramagnetism which corresponds to the singlet ground state 7 F 0 of Eu 3؉ ions, with a spin-orbit coupling constant ‫؍‬ 323 cm ؊1 . NaSmTiO 4 also behaves as a Van Vleck paramagnet. The magnetic susceptiblity of NaGdTiO follows the Curie law. The Mo¨ssbauer spectrum of NaEuTiO 4 clearly shows that Eu is in the trivalent state, and a quadrupole interaction is found to exist in this compound. From the EPR measurement the g value of Gd 3؉ in NaGdTiO 4 is determined to be 1.99. Both the magnetic susceptibility results and the EPR measurements show that Gd 3؉ ion in this compound is scarcely affected by the crystal field.