Dielectric hysteresis in single crystal BiFeO3

Crystallographic and Magnetic Structure of the Perovskite-Type Compound BaFeO2.5: Unrivaled Complexity in Oxygen Vacancy Ordering

“…In the brownmillerite-type structure, the B site cation is found in octahedral and tetrahedral coordination (ratio 1:1, with layered ordering of the differently coordinated B-site ions) and the structure can be found in a large variety of compounds, including SrFeO 2. 5 23,24 . Since such anion deficient perovskites are of interest for a wide range of applications, the clarification of the different types of anion vacancy ordering is important, since even for systems which appear cubic by diffraction techniques, local vacancy ordering may occur.…”

“…Mössbauer spectroscopy data 27 were interpreted in terms of the structure which was assumed to contain seven crystallographically different Fe 3+ ions resulting in a coordination scheme of Ba 7 Fe [6] 3 Fe [5] 1 Fe [4] 3 O 17.5 and which, in principal, is in agreement with a general site multiplicity of 4 for P2 1 /c. Attempts to investigate the explicit order of vacancies were performed by HREM and CIP experiments 28 and helped to reveal a general pattern for this ordering.…”

Magnetic and magnetoelectric studies in pure and cation doped

“…Though the physics of ferroelectricity and magnetoelectric (ME) coupling in AMnO 3 is very exciting, they are not useful for practical applications at room temperature since the magnetic field-induced ferroelectric polarization is rather small and the magnetic transition occurs mostly below the liquid nitrogen temperature. The ferrimagnetic magnetic transition of PbFe 0.5 Nb 0.5 O 3 is also below 300 K. 8 The high values of ferroelectric Curie temperature (T C(FE) ~ 836 °C) 9,10 and antiferromagnetic transition temperature (T N ~ 370 °C) 11 found in BiFeO 3 make this compound more attractive. Ferroelectricity in BiFeO 3 is driven by the sterochemical 2 activity of 6s 2 lone pair of Bi 3+ ions, whereas the Fe ions order antiferromagnetically.…”

Electrical Processes in Polycrystalline BiFeO3 Film

“…As an oxide with perovskite structure, Bismuth ferrite (BiFeO 3 , BFO) has been studied from 1970s (Teague, et al 1970;Kaczmarek, et al 1975). The structure and magnetic properties of BFO were confirmed before 1970s.…”

“…BFO is G-type antiferromagnetic. It was controversial about whether BFO was ferroelectrics until the hysteresis loop of single crystal BFO was measured in 1970 (Teague, et al 1970). According to Teague's results, the single crystal BFO was anisotropy.…”