Multiferroic composites in nano-microscale with non-solid solution by Co-ferrite and (K0.5Na0.5)NbO3-based ferroelectric matrix

作者：Zhou Yun; Zhang Jincang^*; Li Li; Su Yuling; Cheng Jinrong; Cao Shixun

来源：Journal of Alloys and Compounds, 2009, 484(1-2): 535-539.

DOI：10.1016/j.jallcom.2009.04.154

• Multiferroic composite
• Dielectric property
• Magnetic property
• Magnetoelectric effect

A new kind of lead-free multiferroic magnetoelectric composites was successfully prepared by incorporating the dispersed CoFe2O4 (CFO) ferromagnetic nanoparticles into (K0.5Na0.5)NbO3-LiSbO3 (KNN-LS5.2) ferroelectric micromatrix. The dependence of dielectric properties and DC magnetization on CFO phase content was systemically studied. The results show that the dielectric constant decreases with increasing CFO phase content at higher frequencies while the loss tangent and the magnetic moment increase with it. Variation of dielectric constant and dielectric loss with frequency also showed dispersion in the low frequency range, and the values of (epsilon(r max) - epsilon(r min))/epsilon(r max) increase with the increase in ferrite CFO content. The value of H-bias corresponding to alpha(max)(E) almost linearly increases with the increase in ferrite CFO content in composites. We can conclude that the main reasons of dispersion were correlative with the heterogeneous conduction in the multiphase structure of the composites. A maximum magnetoelectric voltage coefficient of 15.01 mV cm(-1) Oe(-1) was observed from the composites with 40 mol% CFO at 1 kHz, which was a very high value in the lead-free magnetoelectric composite system for the potential use on actuators and sensors, etc.

• 出版日期2009-9-18
• 单位中国计量大学; 上海大学