MgO/SrO/La_2O_3多元添加对(Zr_(0.8)Sn_(0.2))TiO_4微波陶瓷结构性能影响  

Effects of MgO, SrO and La_2O_3 Co-doping on Structure and Properties of(Zr_(0.8)Sn_(0.2))TiO_4 Ceramics

作　　者：孙庆磊[1] 周洪庆[1] 钱磊[1] 王亚洲[1] 朱海奎[1] 岳振星[2] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《无机材料学报》2016年第8期812-818,共7页Journal of Inorganic Materials

基　　金：江苏省2015年度普通高校研究生实践创新计划项目(SJZZ15_0095);教育部创新团队项目(IRT_15R35);江苏高校优势学科建设工程资助项目(PAPD)~~

摘　　要：基于液相促进固相反应烧结机制,设计Mg O/Sr O/La_2O_3多元复合添加(Zr_(0.8)Sn_(0.2))TiO_4(ZST)体系,探究复合添加剂对ZST陶瓷的物相组成、微观结构、烧结特性以及高频介电性能等参数的影响。实验结果表明:陶瓷的主晶相均为ZST相;适量添加Mg O/Sr O/La_2O_3可以有效地降低ZST陶瓷的烧结温度,获得较优的微波介电性能;但Mg O添加量的增多对材料的综合性能有小幅度的影响;Sr O的添加量过大会造成晶粒的不完全生长、瓷体不致密和气孔的增多,从而导致材料的密度、介电常数和Q×f值的下降;此外,添加剂对陶瓷的频率温度系数(τ_f)影响不大。在复合添加0.2wt%Mg O、0.6wt%Sr O、1.0wt%La_2O_3时,1300℃保温5 h的ZST陶瓷综合性能优异:ρ=5.14 g/cm^3,ε_r=40.11,Q×f=51000 GHz(f=5.61 GHz),τ_f=-2.85×10^(-6)℃^(-1)。（Zr_（0.8）Sn_（0.2））TiO_4（ZST） ceramics were fabricated via conventional solid-state reaction method which was promoted by liquid phase. The effects of Mg O, Sr O and La_2O_3 co-doping ZST ceramics on phase composition, microstructures, sintering behavior, and high frequency dielectric properties were investigated systematically. The results showed that the main crystalline phase of the ceramics was ZST. The appropriate amount of Mg O, Sr O and La_2O_3 additions effectively decreased the sintering temperature of ZST ceramics and improved the microwave dielectric properties. The increment of Mg O addition influenced comprehensive properties of ZST ceramics slightly. The decrement in bulk densities, dielectric constants and Q×f values with excessive Sr O addition was due to incomplete growth of grains, incompact structures and increasing porosities. Additionally, the additives did not affect obviously the temperature coefficient of resonant frequency（τ_f） of the ceramics. When added 0.2wt% Mg O, 0.6wt% Sr O and 1.0wt% La_2O_3 and sintered at 1300 for ℃ 5 h, ZST ceramics displayed the optimum comprehensive prop-erties： ρ = 5.14 g/cm^3, ε_r = 40.11, Q×f = 51000 GHz（f = 5.61 GHz）, τ_f = –2.85×10^（-6）℃^（-1）.

关 键 词：(Zr0.8Sn0.2)TiO4 MgO/SrO多元添加 微观结构 烧结特性 介电性能 

分 类 号：TB34[一般工业技术—材料科学与工程]