Structure, infrared spectra and microwave dielectric properties of the novel Eu2TiO5 ceramics

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, t...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2020-08, Vol.103 (8), p.4333-4341
Main Authors: Jinjie, Zheng, Yaokang, Yang, Haitao, Wu, Zhou, Yuanyuan, Zhang, Zhiliang
Format: Article
Language:English
Subjects:
Bond energy
Ceramics
Chemical bonds
Dielectric properties
Eu2TiO5
far‐infrared spectrum
Infrared spectra
Lattice parameters
microwave dielectric ceramics
P‐V‐L chemical bond theory
Thermal expansion
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Summary: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 εr ~ 14.4 ± 0.2, Q × f ~ 21 000 ± 500 GHz, and τf  ~ −10 ± 2 ppm/°C.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17092