Multiferroic properties and impedance spectrum of Ho³⁺ and Ti⁴⁺ co-doped BiFeO₃ ceramics

Abstract

Bi_0.8Ho_0.2Fe_0.95Ti_0.05O₃ (BHFTO) nanoceramics with a grain size below 100 nm were prepared by spark plasma sintering (SPS) method, and their sintering process, microstructure, dielectric, and magnetic properties were studied. The analysis of microstructure suggests the formation of orthorhombic structure (space group, Pnma) in BHFTO nanoceramics with a homogeneous distribution in grain sizes. The defect types in BHFTO nanoceramics are distinguished, oxygen vacancies are dominant defects in BHFTO nanoceramics. BHFTO nanoceramics showed a high magnetization due to the broken of spin spiral structure in BiFeO₃ system.

Keywords:

• BiFeO3
• multiferroics
• nanoceramics
• defects

Additional information

Funding

This work was supported by the Project of Department of Education, Jiangxi Province (No. GJJ180982), Natural Science Foundation of Jiangxi University of Technology (No. ZR1810).