Effect of Ca/Zr co-substitution on microstructure and microwave dielectric characteristics of CaSmAlO4-based ceramics
Ca1+xSm1−xAl1−xZrxO4 (x=0.1, 0.2, 0.3, 0.4) microwave ceramics in the lamellar perovskite structure were fabricated by the traditional solid-phase synthesis method. The effect of the Ca/Zr co-substitution on the crystal structure, microstructure, and dielectric characteristics of the microwave ceram...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Powder Metallurgy Technology
2021-04-01
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| Series: | Fenmo yejin jishu |
| Subjects: | |
| Online Access: | https://pmt.ustb.edu.cn/article/doi/10.19591/j.cnki.cn11-1974/tf.2021020002 |
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| Summary: | Ca1+xSm1−xAl1−xZrxO4 (x=0.1, 0.2, 0.3, 0.4) microwave ceramics in the lamellar perovskite structure were fabricated by the traditional solid-phase synthesis method. The effect of the Ca/Zr co-substitution on the crystal structure, microstructure, and dielectric characteristics of the microwave ceramics were investigated by X-ray diffraction (XRD), Raman spectra, electron backscatter diffraction (EBSD), energy dispersive spectroscopy (EDS), and vector network analysis (VNA). In the results, the cell parameters (a, c), cell volume (Vcell), and theoretical polarizability (αtheo) increase with the increase of x, leading to the increase of the dielectric constant (εr) and resonant frequency temperature coefficient (τf); meanwhile, a moderate amount of CaO secondary phases can improve the quality factor (Q×f). Ca1.2Sm0.8Al0.8Zr0.2O4 (x=0.2) ceramics show the excellent microwave performance as εr=20.16, Q×f=72489, and τf = −3.46×10−6·℃−1. |
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| ISSN: | 1001-3784 |