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Li2AGeO4 (A = Zn, Mg): Two novel low-permittivity microwave dielectric ceramics with olivine structure
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2017-12-21 , DOI: 10.1016/j.jeurceramsoc.2017.12.038
Chunchun Li , Huaicheng Xiang , Minyu Xu , Ying Tang , Liang Fang

Two low-permittivity dielectric materials Li2AGeO4 (A = Zn, Mg) were prepared via the solid-state reaction method. X-ray diffraction analysis and Rietveld refinement indicated that both ceramics crystallize in an orthorhombic olivine structure with a space group Pmn21. Dense ceramics with high relative density and homogeneous microstructure were obtained. Li2ZnGeO4 densified at 1200 °C possessed a relative permittivity εr = 6.5, a quality factor Q × f = 35,400 GHz, and a temperature coefficient of resonant frequency. Li2MgGeO4 exhibited εr = 6.1, Q × f = 28,500 GHz, and τf = –74.7 ppm/°C when sintered at 1220 °C. Additionally, the large negative τf values of Li2AGeO4 (A = Zn, Mg) ceramics were successfully adjusted compensated by forming composite ceramics with CaTiO3 and near-zero τf values of +2.9 ppm/°C and +5.8 ppm/°C were achieved in 0.92Li2ZnGeO4-0.08CaTiO3 and 0.90Li2MgGeO4-0.10CaTiO3, respectively.



中文翻译:

Li 2 AGeO 4(A = Zn,Mg):两种新颖的具有橄榄石结构的低介电常数微波介电陶瓷

通过固态反应法制备了两种低介电常数的电介质材料Li 2 AGeO 4(A = Zn,Mg)。X射线衍射分析和Rietveld精炼表明,两种陶瓷均以正交晶体橄榄石结构(空间群为Pmn2 1)结晶。获得具有高相对密度和均质微观结构的致密陶瓷。李2 ZnGeO 4在1200致密化℃下所具有的相对介电常数ε - [R  =  6.5,品质因数Q×˚F  = 35400千兆赫,及谐振频率的温度系数。李2 MgGeO 4显示出ε - [R =  6.1,Q×˚F  = 28500千兆赫,和τ ˚F  = -74.7 PPM /℃时,在1220℃下烧结°。此外,该大的负τ ˚F李的值2 AGEO 4(A =锌,镁)陶瓷成功地调节通过用的CaTiO形成复合陶瓷补偿3和接近零的τ ˚F 2.9 PPM的值/℃和5.8 ppm的/℃分别在0.92Li 2 ZnGeO 4 -0.08CaTiO 3和0.90Li 2 MgGeO 4 -0.10CaTiO 3中实现

更新日期:2017-12-21
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