钙钛矿锰氧化物Ca_(0.5)Nd_(0.5)(Mn_(0.7)Fe_(0.3))O_3掺杂对Ca_(0.61)Nd_(0.26)TiO_3微波介电性能的影响  

Effects of perovskite manganese oxides Ca_(0.5)Nd_(0.5)(Mn_(0.7)Fe_(0.3))O_3 addition on microwave dielectric properties of Ca_(0.61)Nd_(0.26)TiO_3 ceramics

作　　者：刘飞[1] 屈婧婧[2] 黄先培[3] 刘心宇[3] LIU Fei QU Jingjing HUANG Xianpei LIU Xinyu(School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi Zhuang Autonomous Region, China Department of Computer Science and Engineering, Guilin University of Aerospace Tectmology, Guilin 541004, Guangxi Zhuang Autonomous Region, China School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi Zhuang Autonomous Region, China)

机构地区：[1]桂林电子科技大学机电工程学院,广西桂林541004 [2]桂林航天工业学院计算机科学与工程系,广西桂林541004 [3]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《电子元件与材料》2017年第2期6-9,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助(No.61561011);广西高校中青年教师基础能力提升项目(No.KY2016YB534)

摘　　要：研究了传统固相反应法制备所得xCa_(0.5)Nd_(0.5)(Mn_(0.7)Fe_(0.3))O_3-(1–x)Ca_(0.61)Nd_(0.26)TiO_3(0.1≤x≤0.25,CNMFT_x)多晶陶瓷相组成、显微结构、烧结性能与微波介电性能之间的影响关系。X射线衍射研究表明,在研究组分范围内CNMFT_x样品均为单一正交钙钛矿结构;当烧结条件为1 400℃/4 h,x=0.1~0.2时,Fe^(3+)/Mn^(3+,4+)替代Ca_(0.61)Nd_(0.26)TiO_3中Ti^(4+)后,相对介电常数(εr为88.5~77.5)、品质因子(Q·f为7 010~9 370 GHz)和谐振频率温度系数(τf为207.4×10^(–6)/℃~149.1×10^(–6)/℃)逐渐降低,而当x=0.25时,εr(73.4)与τf值(119.6×10^(–6)/℃)仍按规律降低,虽然此时样品晶粒尺寸更为均匀,但Q·f值(5 100 GHz)降幅增加。因此,对于ABO3型钙钛矿结构的微波介质陶瓷,当具有铁磁效应离子的添加量较小时,微波介电性能的变化符合预期规律;但当置换量达到一定比例时,铁磁性增加,导电性增强,巨磁电阻效应减小,致使微波陶瓷介电损耗增加。xCao 5Nd0.5（Mno.vFe0.3）O3-（1-x）Ca0.61Nd0.26TiO3（0.1 ≤x≤0.25, CNMFTx） ceramics were prepared by the solid state reaction method. The phases structure, microstructures, sintering behaviors and microwave dielectric properties of the ceramics were studied. XRD results show that an orthorhombic perovskite structure is formed in the CNMFTx compositions with x = 0.1-0.25. With an increasing of Fe3＋/Mn3＋,4＋ substitution for Ti4＋ in CNMFTx （x = 0.1-0.2） samples sintered at 1 400 ℃ for 4 h, the relative permittivity （εr）, quality factor （Q · J） and temperature coefficient of resonant frequency （τf） decrease gradually from 88.5, 9 370 GHz and 207.4×106/℃ to 77.5, 7 010 GHz and 149.1×10-5/℃, respectively. When x = 0.25, the er （73.4） and τfvalue （119.6× 10-6/℃） of the samples are still decreased in accordance with the expectation, however, an obvious decreasing Q τfvalue （5 100 GHz） is found in the sample with uniform grain size distribution. Thus, for the microwave ceramic dielectric materials （ABO3 perovskite structure）, a small number of ferromagnetism Fe3＋/Mn3＋,4＋ ions additive can make a coexistence in ferromagnetism and microwave dielectric properties. But an increasing proportion of these ions additive can also enhance the dielectric loss due to an increase in ferromagnetism, conductivity and a decrease in rnagnetoresistance.

关 键 词：正交相 显微结构 铁磁性 Fe3＋/Mn（3＋ 4＋） 微波介电性能 Ca（0.61）Nd（0.26）TiO3 

分 类 号：TM28[一般工业技术—材料科学与工程]