Abstract Low dielectric loss Zn0.7Mg0.3TiO3 and MgTiO3 microwave dielectric resonators were prepared by the conventional solid state reaction method. The microwave interaction with these materials has been studied using both single-mode and multimode microwave furnaces operating at a frequency of 2.45 GHz. Microwave sintering could be achieved using a multimode microwave furnace only, whereas, interaction with a single-mode furnace showed plasma generation. Phase formation was observed by X-ray diffraction. Microwave dielectric characteristics such as dielectric constant (s’), quality factor (Q*f) and temperature coefficient of resonant frequency (t/) of microwave sintered samples were measured using a vector network analyzer and compared with conventional sintered ones. Microstructure of all the conventional and microwave sintered samples was observed using high resolution scanning electron microscope. Although s’ and t/ of the conventional and microwave sintered samples are found to be comparable, the quality factor (the vital characteristic of dielectric resonators) of microwave sintered samples are observed to be much lower than those obtained by conventional sintering. The difference in these values is discussed with respect to the grain size.

中文翻译：

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低损耗（Zn, Mg）TiO3 介电谐振器材料的微波烧结研究

摘要 采用常规固相反应法制备了低介电损耗Zn0.7Mg0.3TiO3和MgTiO3微波介质谐振器。使用频率为 2.45 GHz 的单模和多模微波炉研究了微波与这些材料的相互作用。微波烧结可以仅使用多模式微波炉来实现，而与单模式炉的相互作用显示等离子体生成。通过X射线衍射观察到相形成。使用矢量网络分析仪测量微波烧结样品的介电常数 (s')、品质因数 (Q*f) 和谐振频率温度系数 (t/) 等微波介电特性，并与传统烧结样品进行比较。使用高分辨率扫描电子显微镜观察所有常规和微波烧结样品的微观结构。尽管发现常规和微波烧结样品的 s' 和 t/ 具有可比性，但观察到微波烧结样品的品质因数（介电谐振器的重要特性）远低于通过常规烧结获得的品质因数。这些值的差异将根据晶粒尺寸进行讨论。