Recent development in lead-free perovskite piezoelectric bulk materials

Multiferroic bismuth ferrite-based materials for multifunctional applications: Ceramic bulks, thin films and nanostructures

The thermodynamic stability of BiFeO3 is investigated by high temperature X-ray diffraction and isothermal heat treatment of Bi2O3−Fe2O3 powder mixture as well as phase pure BiFeO3 prepared by a wet chemical route. Experimental evidence for decomposition of BiFeO3 to Bi25FeO39 and Bi2Fe4O9 in the temperature interval 720−1040 K is reported. The experimental observations are discussed in terms of available thermodynamic data for the system. Finally, the stability of BiFeO3 and related Bi-based perovskites is discussed in relation to Goldschmidt tolerance factor and the influence of pressure and chemical substitution.

On the Thermodynamic Stability of BiFeO3

BiFeO3, the paradigm of single-phase multiferroic materials, has potential applications in information storage, sensors and actuators This perovskite has a rhombohedral R3c crystallographic structure and shows a spin-modulated cycloidal magnetic structure with a modulation period of ∼62 nm It reveals magnetoelectric coupling at room temperature However, its low remanent magnetization and relatively important leakage current are the main limitations for possible applications In this review we summarize recent studies on doped BiFeO3 Special attention is put on obtaining and sintering bulk BiFeO3 ceramics and the effect of doping on the electric and magnetic properties

BiFeO3: A review on synthesis, doping and crystal structure

Investigation of transport behavior in Ba doped BiFeO3

The authors prepared Yb-doped bismuth iron oxide ceramics (Bi1−xYbxFeO3, with 0⩽x⩽0.20) by rapid liquid phase sintering method and investigated the material’s structures and electrical properties. The x-ray diffraction measurements showed that the doping of Yb has induced noticeable lattice distortion in the ceramics, and a largest distortion was observed when the concentration of Yb was 15%. By doping electrical resistivity, ferroelectric and dielectric properties of the ceramics were improved. Among all samples, BiFeO3 doped with 15% Yb was found to have the smallest leakage current density (<10−7A∕cm2) and the largest remnant polarization (8.5μC∕cm2).

/pdf/processing-and-properties-of-yb-doped-bifeo3-ceramics-1514mnkw56.pdf

Processing and properties of Yb-doped BiFeO3 ceramics

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Processing and properties of Yb-doped BiFeO3 ceramics