Structure, infrared spectra and microwave dielectric properties of the novel Eu 2 TiO 5 ceramics
Structure, infrared spectra and microwave dielectric properties of the novel Eu 2 TiO 5 ceramics
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DOI：
10.1111/jace.17092
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发表时间：
2020-08
影响因子：
3.9
通讯作者：
Zheng Jinjie;Yang Yaokang;Wu Haitao;Y. Zhou;Zhiliang Zhang
中科院分区：
文献类型：
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作者：
Zheng Jinjie;Yang Yaokang;Wu Haitao;Y. Zhou;Zhiliang Zhang
本文首次研究了传统固态法制备eu2tio5陶瓷的微波介电性能。x射线衍射得到了具有Pnam空间群的正交结构。根据P - V - L化学键理论和改进的晶格参数，计算了eu2tio5的键离子性、晶格能、键能和热膨胀系数等键参数。讨论了化学键特性与微波介电性能的关系。此外，远红外反射光谱表明，结构声子振荡的吸收可能是eu2tio5陶瓷极化的主要原因。在1300℃下烧结6h的eu2tio5陶瓷具有优异的微波介电性能，εr~ 14.4±0.2,Q×f~ 21000±500 GHz, τf~−10±2 ppm/°C。
The microwave dielectric properties of Eu2TiO5ceramic 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 Eu2TiO5were 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 Eu2TiO5ceramic. Eu2TiO5ceramic sintered at 1300°C for 6 hours possessed excellent microwave dielectric properties ofεr~ 14.4 ± 0.2,Q×f~ 21 000 ± 500 GHz, andτf~ −10 ± 2 ppm/°C.