CaCu3Ti4O12/NiCuZn铁氧体基磁电复合材料研究

将CCTO(CaCu3Ti4O12)与NiCuZn铁氧体进行复合,系统地研究了组分变化对这种新型磁电复合材料的烧结性能、晶相结构、显微结构和磁电性能的影响。随后,为了实现复合材料的低温烧结以及综合考虑复相陶瓷的磁电性能,选取80%(质量分数,下同)NiCuZn铁氧体/20%CCTO组分,以BBSZ(Bi2O3-H3BO3-SiO2-ZnO)玻璃作为助熔剂,研究了CCTO/NiCuZn铁氧体基复合材料的烧结行为和磁电性能。结果表明,掺杂BBSZ后,900℃下烧结的所有样品的密度均达到了复相陶瓷理论密度的95%,且复相陶瓷的介电常数和磁导率在1～30 MHz范围内均不依赖于频率的变化。在10 MHz的频率下,当BBSZ的含量从0增加到3%时,复相陶瓷磁导率μ从13.2增加到47.9,磁损耗tanδμ从0.022下降到0.017,同时,样品的谐振频率从109Hz左右移动到3.2×108Hz。相应地,复相陶瓷的介电常数ε从9.2增加到16,介电损耗tanδε从0.069下降到0.012。这一优异的整体性能使其有望实际应用。

Investigations on CaCu3 Ti4 O12/NiCuZn Magnetoelectric Composite Materials

In this paper,CCTO/NiCuZn ferrite composite materials were synthesized by the the conventional ceramic processing.The effect of composition on the sintering properties,crystalline-phase structure,microstructure,magnetic and dielectric properties of the new ferrite-dielectric composite materials had been investigated systematically.To realize low temperature sintering of the composite materials and by a comprehensive evaluation of both magnetic and dielectric properties,we chose the composition of 80% NiCuZn(mass fraction) ferrite/20 wt% CCTO in here.Then,BBSZ glass was considered as an additive and its effect on sintering behavior,magnetic and dielectric properties of CCTO/NiCuZn ferrite composite materials were studied.The results showed that the density of all BBSZ-doped samples sintered at 900 ℃ had reached 95% of theoretical density.The dielectric constant and permeability of composites showed weak frequency dependence in a frequency range from 1 MHz to 30 MHz.At 10 MHz,as the BBSZ content increased from 0 to 3%(mass fraction),the permeability μ of composites increased from 13.2 to 47.9,and the magnetic loss tanδμ decreased from 0.022 to 0.017.Meanwhile,the resonant frequency of composites decreased from 109 Hz to 3.2×108 Hz.Correspondingly,the dielectric constant ε of composites increased from 9.2 to 16,and the dielectric loss tanδε decreased from 0.069 to 0.012.The excellent whole performances of composites are expected to be able to promote practical applications.