(Mg1-xZnx)2 SiO4 (0≤x≤1)陶瓷微波介电性能研究

doi:10.3724/SP.J.1077.2010.00255

摘要/Abstract

摘要： 采用固相反应法制备(Mg _1-x Zn_x)₂ SiO₄ (0≤x≤1)微波介质陶瓷, 研究(Mg _1-x Zn_x)₂ SiO₄ 陶瓷在0≤x≤1范围内的相演变、微结构与其微波介电性能间相互关系. XRD测试结果表明：橄榄石结构的Mg₂SiO₄与硅矽矿结构的Zn₂SiO₄在晶体结构上存在很大差别, (Mg, Zn)₂ SiO₄在0≤x≤1范围内只能部分地实现有限固溶. 背散射电子扫描显微镜（BESEM）测试结果显示：随着x的增加, MgSiO₃第二相得到抑制; 陶瓷出现液相烧结, 促进晶粒生长与玻璃相在晶界处沉积. 微波介电性能测试结果表明：由于Zn ²⁺离子极化能力大于Mg ²⁺离子, (Mg _1-x Zn_x)₂ SiO₄ (0≤x≤1)陶瓷介电常数随x值增加而增大; 0≤
x≤1范围内, Mg₂SiO₄陶瓷微波性能由于第二相、气孔率增加与晶粒增大而降低, Zn₂SiO₄陶瓷由于微结构得到改善, 陶瓷微波性能得到优化. 当x=0.6时, 得到较好的(Mg _0.4 Zn _0.6)₂ SiO₄ 陶瓷微波性能为：ε_r=6.6, Qf=95650GHz,τ_f=-60×10^-6/℃

关键词: (Mg _1-x Zn_x)₂ SiO₄, 陶瓷, 微波性能

Abstract: The phase evolutions, microstructures, and microwave dielectric properties of (Mg _1-x Zn_x)₂ SiO₄ (0≤x≤1) ceramics were investigated. The XRD results show that Mg₂SiO₄ and Zn₂SiO₄are partly limited solid solution in the systems of (Mg _1-x Zn_x)₂ SiO₄ ceramics, due to the large differences between their crystal structures. BESEM images show that with the increases of x, the second phase of MgSiO3 will be suppressed, and the occurrence of liquid phase sintering accelerates the growth of crystal grain and aggradations of glass phase in the boundary of grain. The dielectric constants of (Mg _1-x Zn_x)₂ SiO₄ ceramics gradually increase because of the polarization of Zn²⁺ ion is larger than that of Mg ²⁺ ion. The microwave properties of (Mg _1-x Zn_x)₂ SiO₄ ceramics change with the variant of x value, together with external factors of the secondary phase, porosity and grain size of(Mg _1-x Zn_x)₂ SiO₄ ceramics. When x is equal to 0.6, the optimum microwave dielectric properties of (Mg_0.4 Zn _0.6 )₂ SiO₄ ceramics is obtained：ε_r=6.6, Qf=95650GHz, τ_f=-60×10^-6 /℃.

Key words: (Mg _1-x Zn_x)₂ SiO₄, ceramics, microwave properties

中图分类号:

TM221

宋开新,应智花,邵李焕,郑梁,徐军明,秦会斌. (Mg_1-xZn_x)₂ SiO₄ (0≤x≤1)陶瓷微波介电性能研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2010.00255.

SONG Kai-Xin,YING Zhi-Hua,SHAO Li-Huan,ZHENG Liang,XU Jun-Ming,QIN Hui-Bin. Investigation of Microwave Dielectric Properties of (Mg_1-xZn_x)₂SiO₄(0≤x≤1) Ceramics[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00255.

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(Mg_1-xZn_x)₂ SiO₄ (0≤x≤1)陶瓷微波介电性能研究

Investigation of Microwave Dielectric Properties of (Mg_1-xZn_x)₂SiO₄(0≤x≤1) Ceramics

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