Structural Evolution and Multiferroics in Sr‐Doped Bi7Fe1.5Co1.5Ti3O21 Ceramics
Abstract
The ceramics with the composition of SrxBi7−xFe1.5Co1.5Ti3O21−δ (0 ≤ x ≤ 1, SBFCT) were prepared by a citrate–nitrate combustion method, and the phase evolution with an increasing Sr content was investigated. Pure Aurivillius phase SBFCT with a layer number of n = 6 was obtained when x ≤ 0.25, and then the structure collapsed to 5 layers for x = 0.50, then alternating 4 and 5 layers for x = 0.75, and finally 4 layers for x = 1.00. Meanwhile, secondary phase Sr1−mBimFe1−iCoiO3−γ appeared when x > 0.25, which is antiferromagnetic (AFM) and with low resistivity. Enhanced ferromagnetic and ferroelectric properties were observed from single phase SBFCTs at the room temperature, and the ferromagnetic transition temperature (Tc) increases with the Sr doping level x in the single phase range. The remnant magnetization (2Mr) is 2.27 emu/g and the remnant polarization (2Pr) is 2.89 μC/cm2 at an applied electric field of 100 kV/cm for the x = 0.25 sample.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 06, 2015
- Source ID
- 10.1111/jace.13495
Entities
People
- Jianlin Wang
- Lin Li
- Min Liu
- Ranran Peng
- Yalin Lu
- Zhengping Fu
Organizations
- 2011 Quantum Information and Quantum Technology Collaborative Innovation Center
- Air Force Office of Scientific Research
- Defense Threat Reduction Agency
- Hefei National Laboratory for Physical Sciences at the Microscale
- National Natural Science Foundation of China
- Natural Science Foundation of Anhui Province
- Program 973
- United States Air Force Academy
- University of Science and Technology of China