Abstract: |
This invention relates to a method for preparing BiFeO3-based multifunctional oxide ceramic. The method comprises: (1) pre-pressing BLTFO8 powder into a disc, loading oxide protective powder (Al2O3, CeO2, ZrO2 or FeO) into a graphite mold, and pressing; (2) transferring the BLTFO8 disc onto the oxide protective powder layer in the mold; (3) continuing adding oxide protective powder into the mold to embed the BLTFO8 disc, and pressing; (4) transferring the mold into an SPS sintering furnace, heating to 600 deg.C within 3 min, then heating to the sintering temperature at a rate of 50 deg.C/min, keeping the temperature, and sintering. Since BiFeO3 has G-type antiferromagnetic structure, doping with rare earth element such as La or Tb, or metal element such as Ba or K can alter its antiferromagnetic structure, and the obtained BiFeO3-based multifunctional oxide ceramic has ferromagnetism at room temperature. The method can inhibit the valency change of the elements and reduce loss, and the BiFeO3-based multifunctional oxide ceramic has good ferroelectric and ferromagnetic properties at room temperature. |