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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Characterization on low loss dielectric Li2MgTiO4 ceramics based on chemical bond theory at microwave frequency
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Characterization on low loss dielectric Li2MgTiO4 ceramics based on chemical bond theory at microwave frequency

机译：基于化学键理论的微波低损耗介电Li2MgTiO4陶瓷的表征

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The low loss microwave dielectric materials Li2MgTiO4 with rock salt structure were prepared by the modified solid state method. Sintering characteristics and microwave dielectric properties were investigated under various sintering temperatures ranging from 1200 degrees C to 1375 degrees C. The crystal structure was studied by the X-ray diffraction and the micro-structure was studied by the scanning electron microscopy (SEM) techniques. Rietveld refinement was used to analyze the structure of the crystalline phase. Based on the cell parameters, the bond ionicity, lattice energy, bond energy and coefficient of thermal expansion were calculated to evaluate the structural characteristics. The epsilon(r) values could be strongly dependent on the bond ionicity of the Ti-O bond. The Q.f values were affected by the lattice energy of Ti-O bonds. As for the tau(f) values, it could be mainly affected by the coefficient of thermal expansion of Li-O bonds. At the sintering temperature of 1350 degrees C, Li2MgTiO4 ceramics exhibited the excellent microwave properties of epsilon(r) = 15.07, Q.f = 97,629 GHz (at 8.2 GHz) and tau(f) = 3.81 ppm/degrees C. These results demonstrated that Li2MgTiO4 ceramics could be promising candidate materials for the application of highly selective microwave ceramic resonators and filters. (C) 2016 Elsevier B.V. All rights reserved.
机译：采用改进的固态法制备了具有岩盐结构的低损耗微波介电材料Li2MgTiO4。在1200℃至1375℃的各种烧结温度下研究了烧结特性和微波介电性能。通过X射线衍射研究了晶体结构，并通过扫描电子显微镜（SEM）技术研究了微结构。 Rietveld精炼用于分析结晶相的结构。根据电池参数，计算键离子性，晶格能量，键能量和热膨胀系数以评估结构特性。 ε值可能强烈依赖于Ti-O键的键离子性。 Q.f值受Ti-O键的晶格能影响。至于tau（f）值，它可能主要受到Li-O键的热膨胀系数的影响。在1350摄氏度的烧结温度下，Li2MgTiO4陶瓷表现出优异的微波特性，ε= 15.07，Qf = 97,629 GHz（在8.2 GHz时）和tau（f）= 3.81 ppm /℃。这些结果表明Li2MgTiO4陶瓷可能是应用高选择性微波陶瓷谐振器和滤波器的有前途的候选材料。 （C）2016 Elsevier B.V.保留所有权利。

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