Electron Paramagnetic Resonance Study of Pr4+Ions Doped in BaSnO3, Ba2SnO4, and Ba3Sn2O7

✍ Scribed by Yukio Hinatsu; Keitaro Tezuka

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 281 KB
• Volume: 138
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7792

✦ Synopsis

The isotropic electron paramagnetic resonance (EPR) spectra of powders with Pr 4؉ doped in the cubic perovskite BaSnO3 and the layered perovskites Ba2SnO4 and Ba3Sn2O7 were measured at 4.2 K. Very large hyperfine interactions with the 141 Pr nucleus were observed in all of the host materials. The results were analyzed based on the weak-field approximation, and the g values and hyperfine coupling constants A were obtained. The measured g values are much smaller than "؊10/7", showing that the crystal field effect on the behavior of a 4f electron is large. The value of " g" decreases from 0.646 (Pr 4؉ /Ba2SnO4) to 0.606 (Pr 4؉ /Ba3Sn2O7) to 0.583 (Pr 4؉ /BaSnO3), which is caused by the increase of the crystal field due to the shortening of the Pr 4؉ -O 2؊ distance. On the other hand, the hyperfine coupling constants are almost constant: A ‫؍‬ 0.060 cm ؊1 .