Correlation among crystal structures, dielectric properties, and lattice vibrations of A(Mg1/2W1/2)O3 (A = Ba, Sr, Ca) ceramics

A 2 MgWO 6 (AMW, A = Ba, Sr, Ca) microwave dielectric ceramics were prepared by a traditional solid-phase synthesis method and then characterized by X-ray diffraction, scanning electron microscopy, Raman, and Fourier transform infrared spectroscopy. The XRD results showed that the main phase of the...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2022-06, Vol.33 (16), p.12573-12583
Main Authors: Liu, Tong, Wang, Xiangyu, Cao, Zhikai, Xu, Yue, An, Zhongfen, Song, Fuzhou, Shi, Feng, Qi, Ze-Ming, Zhang, Lingcui
Format: Article
Language:English
Subjects:
Barium
Calcium
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Crystal lattices
Crystal structure
Crystals
Degree of crystallinity
Dielectric loss
Dielectric properties
Fourier transforms
Infrared spectra
Lattice vibration
Materials Science
Optical and Electronic Materials
Perovskites
Solid phase synthesis
Spectrum analysis
Strontium
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Summary:A 2 MgWO 6 (AMW, A = Ba, Sr, Ca) microwave dielectric ceramics were prepared by a traditional solid-phase synthesis method and then characterized by X-ray diffraction, scanning electron microscopy, Raman, and Fourier transform infrared spectroscopy. The XRD results showed that the main phase of the Ba(Mg 1/2 W 1/2 )O 3 and Sr(Mg 1/2 W 1/2 )O 3 samples was cubic perovskite (Fm-3m) and that of the Ca(Mg 1/2 W 1/2 )O 3 sample was monoclinic perovskite (P2 1 /c). The SEM images showed that the Sr(Mg 1/2 W 1/2 )O 3 ceramic was composed of dense grains with a uniform particle distribution. It had a high degree of crystallinity, while the Ba(Mg 1/2 W 1/2 )O 3 ceramic had many pores, and the Ca(Mg 1/2 W 1/2 )O 3 ceramic had no obvious interfaces. The intrinsic properties were calculated by fitting the infrared spectra, which showed that the dielectric loss of the AMW ceramics was connected to the vibrations of the Mg/WO 6 octahedra, and the dielectric constants were related to the central symmetric vibrations of A-site cations. The dielectric response mechanism of the AMW microwave dielectric ceramics was revealed by the lattice vibration, and the relationships between the crystal structure and dielectric properties were studied based on lattice vibrations.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-022-08173-1