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Ceramics international v.43 no.6, 2017년, pp.5189 - 5194   SCI SCIE SCOPUS
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Effect of oxygen vacancies on the microstructure and multiferroic behavior of Bi4.25La0.75Fe0.5Co0.5Ti3O15 ceramics

Zou, Baowen (College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China ); Wu, Yuying (College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China ); Wang, Wei (College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China ); Mao, Xiangyu (College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China ); Sun, Hui (College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China ); Lu, Yalin (CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China ); Chen, Xiaobing (College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China );
  • 초록  

    Abstract In order to reveal the solid relationship between oxygen vacancies and multiferroic properties, polycrystalline Bi 4.25 La 0.75 Fe 0.5 Co 0.5 Ti 3 O 15 (BLFCT) ceramics were sintered in argon (BLFCT-Ar), air (BLFCT-air) and oxygen (BLFCT-O 2 ) by conventional solid state reaction, respectively. Their microstructures, ferroelectric, magnetic properties and valence states of magnetic ions were investigated and compared. X-ray diffraction patterns confirmed a single phase crystal structure in all samples. The lattice constants were calculated and the minor variation of the lattice constants is attributed to the different oxygen vacancy concentration. Furthermore, different oxygen vacancy concentration may be responsible for the different values of RT-recorded remanant magnetization (2 M r ), remanent polarization (2 P r ) as well as magnetic phase transition temperatures ( T CM ). The magnetic response of sample sintered in argon (2 M r = 0.52emu/g, T CM =3 392K) is significantly superior to that of the others, while the sample sintered in oxygen exhibits a better remnant polarization (2 P r = 11.6 μC/cm 2 ) at an applied electric field of 160kV/cm. The BLFCT-Ar sample was then annealed in oxygen to further justified the dependence of 2 P r and 2 M r on oxygen vacancies. Finally, outcome of the XPS measurement manifested the ratios of Fe 2+ /Fe 3+ and Co 2+ /Co 3+ , and reconfirmed the different oxygen vacancy concentration in three samples.


  • 주제어

    Multiferroic .   Ceramic .   Oxygen vacancy .   Magnetism .   Ferroelectricity.  

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