The microwave dielectric properties of Eu₂TiO₅ ceramic prepared by a conventional solid‐state method were investigated for the first time. An orthorhombic structure with Pnam space group was obtained from x‐ray diffraction. On the basis of P‐V‐L chemical bond theory and refined lattice parameters, the bond parameters of bond ionicity, lattice energy, bond energy, and coefficient of thermal expansion of Eu₂TiO₅ were computed. The relationship between chemical bond characteristics and microwave dielectric properties was discussed. Besides, far‐infrared reflective spectra indicated the absorption of structural phonon oscillation might be the main contribution to polarization for Eu₂TiO₅ ceramic. Eu₂TiO₅ ceramic sintered at 1300°C for 6 hours possessed excellent microwave dielectric properties of ε_r  ~ 14.4 ± 0.2, Q  × f  ~ 21 000 ± 500 GHz, and τ_f ~ −10 ± 2 ppm/°C.

中文翻译：

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新型Eu2TiO5陶瓷的结构，红外光谱和微波介电性能

首次研究了用常规固态方法制备的Eu ₂ TiO ₅陶瓷的微波介电性能。通过X射线衍射获得具有Pnam空间群的正交结构。根据P‐V‐L化学键理论和精细的晶格参数，计算了键离子性，晶格能，键能和Eu ₂ TiO ₅的热膨胀系数的键参数。讨论了化学键特性与微波介电性能之间的关系。此外，远红外反射光谱表明，结构声子振荡的吸收可能是Eu ₂ TiO ₅极化的主要贡献。陶瓷的。的Eu ₂的TiO ₅的陶瓷在1300℃下烧结6小时，所具有的优异的微波电介质特性ε _{- [R}  〜14.4±0.2，Q  ×  ˚F  〜21 000±500千兆赫，和τ _˚F 〜-10±2 PPM /℃。