Method for preparing bismuth ferrite based multifunctioanl oxide ceramic material
Title:
Method for preparing bismuth ferrite based multifunctioanl oxide ceramic material
Application Number:
200710099070
Application Date:
2007/05/11
Announcement Date:
2007/10/10
Pub. Date:
Publication Number:
101050120
Announcement Number:
Grant Date:
Granted Pub. Date:
ApplicationType:
Invention
State/Country:
11[China|beijing]
IPC:
C04B 35/63C04B 35/645C04B 35/40
Applicant(s):
Tsinghua Univ.
Inventor(s):
Nan Cewen, Jiang Qinghui, Lin Yuanhua, Shen Zhijian
Key Words:
ceramic material, multifunctioanl, bismuth ferrite
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.

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