电子元件与材料
電子元件與材料
전자원건여재료
ELECTRONIC COMPONENTS & MATERIALS
2014年
7期
24-29
,共6页
任丽%张荣芬%李峥%张安邦%邓朝勇
任麗%張榮芬%李崢%張安邦%鄧朝勇
임려%장영분%리쟁%장안방%산조용
钛酸钡%镍锌铁氧体%复合陶瓷%介电性能%巨介电常数%介电损耗%Maxwell-Wagner模型
鈦痠鋇%鎳鋅鐵氧體%複閤陶瓷%介電性能%巨介電常數%介電損耗%Maxwell-Wagner模型
태산패%얼자철양체%복합도자%개전성능%거개전상수%개전손모%Maxwell-Wagner모형
BaTiO3%NiZnFe2O4%composite ceramics%dielectric properties%giant permittivity%dielectric loss%Maxwell-Wagner model
采用传统的固相反应法和氧化物陶瓷工艺制备了无铅磁电复合陶瓷(1–x)BaTiO3/x Ni0.5Zn0.5Fe2O4(质量配比,x=0,0.2,0.5,0.8)(BTO/NZF),研究了NZF含量对复合陶瓷的物相组成、微观形貌、致密度和介电性能的影响。结果表明:当NZF含量较低(x=0,0.2,0.5)时,NZF对复合陶瓷有介电稀释效应;当NZF含量较高(x=0.8)时,复合陶瓷晶粒尺寸、致密度及两相间接触面积增大,其NZF含量达到复合陶瓷渗流阈值,产生Maxwell-Wagner (M-W)表面极化效应,使得复合陶瓷在低频(f=40 Hz)下具有高的巨介电常数(ε′=312238)和较低的介电损耗(tanθ=0.40)。
採用傳統的固相反應法和氧化物陶瓷工藝製備瞭無鉛磁電複閤陶瓷(1–x)BaTiO3/x Ni0.5Zn0.5Fe2O4(質量配比,x=0,0.2,0.5,0.8)(BTO/NZF),研究瞭NZF含量對複閤陶瓷的物相組成、微觀形貌、緻密度和介電性能的影響。結果錶明:噹NZF含量較低(x=0,0.2,0.5)時,NZF對複閤陶瓷有介電稀釋效應;噹NZF含量較高(x=0.8)時,複閤陶瓷晶粒呎吋、緻密度及兩相間接觸麵積增大,其NZF含量達到複閤陶瓷滲流閾值,產生Maxwell-Wagner (M-W)錶麵極化效應,使得複閤陶瓷在低頻(f=40 Hz)下具有高的巨介電常數(ε′=312238)和較低的介電損耗(tanθ=0.40)。
채용전통적고상반응법화양화물도자공예제비료무연자전복합도자(1–x)BaTiO3/x Ni0.5Zn0.5Fe2O4(질량배비,x=0,0.2,0.5,0.8)(BTO/NZF),연구료NZF함량대복합도자적물상조성、미관형모、치밀도화개전성능적영향。결과표명:당NZF함량교저(x=0,0.2,0.5)시,NZF대복합도자유개전희석효응;당NZF함량교고(x=0.8)시,복합도자정립척촌、치밀도급량상간접촉면적증대,기NZF함량체도복합도자삼류역치,산생Maxwell-Wagner (M-W)표면겁화효응,사득복합도자재저빈(f=40 Hz)하구유고적거개전상수(ε′=312238)화교저적개전손모(tanθ=0.40)。
The lead-free composite ceramics (1–x)BaTiO3/xNi0.5Zn0.5Fe2O4 (mass ration, x=0, 0.2, 0.5, 0.8) were prepared by conventional solid-state reaction route and the oxide ceramic technology. Influences of NZF content on the phase composition, microstructure, density and dielectric properties of the composite ceramic were studied. The results show that, NZF has dielectric dilution effect on the composite ceramics when NZF content(x=0, 0.2, 0.5) is lower. And when NZF content is high (x = 0.8), composite ceramic’s grain size, density and contact area between the two phases increase; NZF content achieves percolation threshold of the composite ceramic, the composite ceramic shows Maxwell-Wagner (M-W) surface polarization effect, which makes the dielectric constant (ε′) of composite ceramic reaches as high as 312 238 while the dielectric loss (tanθ) keeps a low value of about 0.40 at low frequency.