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Structure, infrared spectra and microwave dielectric properties of the novel Eu 2 TiO 5 ceramics
Author(s) -
Jinjie Zheng,
Yaokang Yang,
Haitao Wu,
Zhou Yuanyuan,
Zhang Zhiliang
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17092
Subject(s) - orthorhombic crystal system , ceramic , dielectric , microwave , materials science , lattice energy , infrared , infrared spectroscopy , chemical bond , bond length , thermal expansion , crystal structure , analytical chemistry (journal) , chemistry , crystallography , optics , composite material , organic chemistry , physics , optoelectronics , quantum mechanics
The microwave dielectric properties of Eu 2 TiO 5 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 Eu 2 TiO 5 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 Eu 2 TiO 5 ceramic. Eu 2 TiO 5 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.