添加TiO_2对0.97Li_(2.3)MgTi_3O_(8.15)-0.03R3725材料的物相组成及介电性能的影响
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摘要
采用传统固相反应法制备了(1-x)(0.97Li_(2.3)MgTi_3O_(8.15)-0.03R3725)-xTiO_2(0.04≤x≤0.10,质量分数)陶瓷,研究了不同含量TiO_2添加对0.97Li_(2.3)MgTi_3O_(8.15)-0.03R3725 (0.97LMT-0.03R3725)陶瓷烧结特性、相结构、微观形貌以及微波介电性能的影响。结果表明:当x≤8%时,(1-x)(0.97LMT-0.03R3725)-xTiO_2所有组分的物相都能够被Li_2MgTi_3O_8和Li_2O标记,并且随着x的增加,Li_2O特征峰的相对强度在逐渐降低,当x增加到10%时,Li_2O反应完全,TiO_2过量,出现TiO_2的特征峰。随着TiO_2含量的增加,陶瓷的烧结温度、ε_r、τ_f和σ_f(抗弯强度)增加,ρ和Q·f先增加后减小。烧结温度为880℃时,0.92(0.97LMT-0.03R3725)-0.08TiO_2陶瓷表现出了优良的综合性能:ε_r=26.8,Q·f=36386 GHz(7.05 GHz),τ_f=3.02×10~(-6)℃~(-1),σ_f=182.5 PMa。且在此温度下介质材料与Ag电极兼容性良好,表明该材料是制备LTCC器件的备选材料。
(1-x)(0.97 Li_(2.3) MgTi_3 O_(8.15)-0.03 R3725)-x TiO_2(0.04 ≤ x ≤ 0.10, mass fraction) ceramics were prepared by the solid state reaction method. The effects of TiO2 addition on the sintering behavior, phase structure, microstructure and microwave dielectric properties of 0.97 Li_(2.3) MgTi_3 O_(8.15)-0.03 R3725(0.97 LMT-0.03 R3725) ceramics were studied. The results show that(1-x)(0.97 LMT-0.03 R3725)-x TiO_2 ceramics are made up of Li_2 MgTi_3 O_8 and Li_2 O phase as x ≤ 8%. With x increasing to 10%, the Li_2 O completes reaction and TiO_2 is in excess, the characteristic peak of TiO_2 shows up. With increasing TiO_2 content, the sintering temperature, ε_r, τ_f and σ_f(flexural strength) increase, while the ρ, and Q·f firstly increase and then decrease. 0.92(0.97 LMT-0.03 R3725)-0.08 TiO_2 ceramic shows excellent comprehensive performance with sintering temperature of 880 ℃ : ε_r=26.8, Q·f=36386 GHz(7.05 GHz), τ_f=3.02×10~(-6)℃~(-1) and σf=182.5 PMa. The dielectric sintered at 880 ℃ shows good chemical compatibility with silver electrodes, indicating that the material could be alternative to fabricated LTCC devices.
(1-x)(0.97 Li_(2.3) MgTi_3 O_(8.15)-0.03 R3725)-x TiO_2(0.04 ≤ x ≤ 0.10, mass fraction) ceramics were prepared by the solid state reaction method. The effects of TiO2 addition on the sintering behavior, phase structure, microstructure and microwave dielectric properties of 0.97 Li_(2.3) MgTi_3 O_(8.15)-0.03 R3725(0.97 LMT-0.03 R3725) ceramics were studied. The results show that(1-x)(0.97 LMT-0.03 R3725)-x TiO_2 ceramics are made up of Li_2 MgTi_3 O_8 and Li_2 O phase as x ≤ 8%. With x increasing to 10%, the Li_2 O completes reaction and TiO_2 is in excess, the characteristic peak of TiO_2 shows up. With increasing TiO_2 content, the sintering temperature, ε_r, τ_f and σ_f(flexural strength) increase, while the ρ, and Q·f firstly increase and then decrease. 0.92(0.97 LMT-0.03 R3725)-0.08 TiO_2 ceramic shows excellent comprehensive performance with sintering temperature of 880 ℃ : ε_r=26.8, Q·f=36386 GHz(7.05 GHz), τ_f=3.02×10~(-6)℃~(-1) and σf=182.5 PMa. The dielectric sintered at 880 ℃ shows good chemical compatibility with silver electrodes, indicating that the material could be alternative to fabricated LTCC devices.
引文
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[5]Shannon R D.Dielectric polarizabilities of ions in oxides and fluorides[J].J.Appl.Phys.,1993,73(1):348-366.
[6]Shannon R D,Oswald R A,Parise J B,et al.Dielectric-constants and crystal-structures of CaYAlO4,CaNdAlO4 and SrLaAlO4,and deviations from the oxide additivity rule[J].J.Solid.State.Chem.,1992,98(1):90-98.