Synthesis and Magnetic Properties of Ln2/3TiO3 (Ln=Pr and Nd)

✍ Scribed by K. Yoshii

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 161 KB
• Volume: 149
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8544

✦ Synopsis

The A-site-de5cient perovskite compounds Ln 2/3 TiO 3 with Ln ‫؍‬ Pr and Nd were synthesized under an H 2 +Ar atmosphere at 1400 and 14503C, respectively. The samples were found to have slight oxygen de5ciencies of &0.006 in Ln 2/ 3 TiO 3+ . It was also found that no single-phase compound could be prepared in air from the same initial mixtures. Their crystal structures were assigned to a double perovskite structure with the orthorhombic space group Pmmm, as in the case of La 2/ 3 TiO 3 . In both systems, no obvious magnetic ordering was observed between 2 and 300 K in susceptibility}temperature ( +T) curves. Inverse susceptibil-ity+temperature (1/ +T ) curves were found to deviate from the Curie+Weiss law below &30 and &90 K for Pr 2/3 TiO 3 and Nd 2/ 3 TiO 3 , respectively. Magnetization+5eld (M+H) curves exhibited paramagnetic pro5les for Pr 2/3 TiO 3 down to 2 K and a tendency toward magnetic ordering for Nd 2/3 TiO 3 at 2 K.