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.

摘要

采用放电等离子体烧结（SPS）法制备了粒径小于100 nm的Bi _0.8 Ho _0.2 Fe _0.95 Ti _0.05 O ₃（BHFTO）纳米陶瓷，研究了其烧结过程，微观结构，介电性能和磁性能。微观结构分析表明在BHFTO纳米陶瓷中形成了正交晶结构（空间群，P nma），晶粒尺寸分布均匀。BHFTO纳米陶瓷中的缺陷类型非常明显，氧空位是BHFTO纳米陶瓷中的主要缺陷。由于BiFeO ₃体系中自旋螺旋结构的破坏，BHFTO纳米陶瓷表现出很高的磁化强度。