Ca/Zr协同置换对CaSmAlO_(4)基陶瓷显微结构与微波介电性能的影响  

Effect of Ca/Zr co-substitution on microstructure and microwave dielectric characteristics of CaSmAlO_(4)-based ceramics

作　　者：李晶 李昊 刘飞 刘绍军[1] LI Jing;LI Hao;LIU Fei;LIU Shao-jun(Powder Metallurgy Research Institute,Central South University,Changsha 410000,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410000

出　　处：《粉末冶金技术》2021年第2期127-134,共8页Powder Metallurgy Technology

摘　　要：通过传统固相合成法成功制备了层状钙钛矿结构Ca_(1+x)Sm_(1−x)Al_(1−x)Zr_(x)O_(4)(x=0.1,0.2,0.3,0.4)微波陶瓷。利用X射线衍射、拉曼光谱、电子背散射衍射、能谱及矢量网络分析表征了Ca/Zr协同置换对微波陶瓷材料晶体结构、微观形貌及介电性能的影响。结果表明,随着x值的增加,晶胞参数(a、c)和晶胞体积(V_(cell))增大,理论极化率(α_(theo))增加,进而导致了介电常数(ε_(r))和谐振频率温度系数(τ_(f))增大;协同置换引入的适量CaO第二相有利于品质因子(Q×f)的提高。当x=0.2时,Ca1.2Sm0.8Al0.8Zr0.2O4陶瓷呈现出良好的微波性能,介电常数为20.16,品质因子为72489,谐振频率温度系数为−3.46×10^(−6)·℃^(−1)。Ca_(1+x)Sm_(1−x)Al_(1−x)Zr_(x)O_(4)(x=0.1,0.2,0.3,0.4)microwave ceramics in the lamellar perovskite structure were fabricated by the traditional solid-phase synthesis method.The effect of the Ca/Zr co-substitution on the crystal structure,microstructure,and dielectric characteristics of the microwave ceramics were investigated by X-ray diffraction(XRD),Raman spectra,electron backscatter diffraction(EBSD),energy dispersive spectroscopy(EDS),and vector network analysis(VNA).In the results,the cell parameters(a,c),cell volume(V_(cell)),and theoretical polarizability(α_(theo))increase with the increase of x,leading to the increase of the dielectric constant(ε_(r))and resonant frequency temperature coefficient(τ_(f));meanwhile,a moderate amount of CaO secondary phases can improve the quality factor(Q×f).Ca1.2Sm0.8Al0.8Zr0.2O4(x=0.2)ceramics show the excellent microwave performance asεr=20.16,Q×f=72489,andτf=−3.46×10^(−6)·℃^(−1).

关 键 词：微波陶瓷 协同置换 钙钛矿 晶体结构 介电性能 

分 类 号：TM22[一般工业技术—材料科学与工程]