Point Defects in Rare-Earth Perovskite Systems BaMO₃ (M = Ce, Pr and Tb) on Dielectric and Magnetic Behaviors

Abstract

This study focused on the rare-earth hetero-valent substituted perovskite BaMO₃ (M = Ce, Pr and Tb) which expected to show magnetoelectric response. In general, diamagnetic feature is presented in the 4f ⁰ BaCeO₃ system down to 2 K which is chosen as a reference in the study while BaPrO₃ (4f ¹) and BaTbO₃ (4f ⁷) display antiferromagnetic phase transition at T_N = 11.7 and 33.2 K, respectively, measured by MPMS magnetometer. At high oxygen partial pressure and donor ion-substitution (Nb⁵⁺), the BaMO₃ systems demonstrate a similar defect chemistry to titanate perovskite which compensated by Ba-vacancy. Dielectric relaxation is detected for the doublet (BaPrO₃ and BaTbO₃) at the antiferromagnetic phase transition region. In order to examine the magnetoelectric response, the 8 Tesla of magnetic field is applied to the samples during the dielectric measurement. BaTbO₃ shows a modest magnetoelectric response around 0.2% at the antiferromagnetic phase transition while that of BaPrO₃ is silent. The activation energies derived from Arrhenius equation are reported to be in the range of 0.2 − 0.6 eV.

Keywords:

• Rare-earth perovskite
• point defect
• magnetoelectric

Acknowledgments

W’e would like to thank our colleagues, Dr. Usa Sukkha, for the helpful support in this research.

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported financially by KMITL under Grant No. KREF116501. The work of Phieraya Pulphol was supported financially by King Mongkut’s Institute of Technology Ladkrabang (KMITL) under Grant No. KREF146503. The work of T. Bongkarm was supported by Naresuan University (NU) and National Science, Research and Innovation Fund (NSRF) with Grant No. R2566B002.