Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/151490
Title: Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies
Authors: Lu, Xiaochi
Du, Zehui
Quan, Bin
Bian, Wenjie
Zhu, Haikui
Zhang, Qitu
Keywords: Engineering::Materials
Issue Date: 2019
Source: Lu, X., Du, Z., Quan, B., Bian, W., Zhu, H. & Zhang, Q. (2019). Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies. Journal of Materials Chemistry C, 7(27), 8261-8268. https://dx.doi.org/10.1039/C9TC01959F
Journal: Journal of Materials Chemistry C
Abstract: Zn[CrGa(₁-ⅹ)]₂O₄ (abbreviated Cr-ZGO) ceramics with x = 0–0.15 were synthesized by the conventional solid state method. The correlation between the microwave dielectric properties and the changes in the crystal structure and cation distribution of Cr-ZGO as a function of Cr³⁺ substitution for Ga3+ has been systematically investigated. The addition of Cr³⁺ promotes the densification of the ceramics and results in a normal spinel structure with Cr³⁺ occupying an octahedral site. With an increase in the Cr3+ content from 0 to 15 mol%, the er of the ceramics increases, while the tf remains almost unchanged and the Q f values ramp up to a maximum at 1 mol% Cr³⁺ addition and then ramp down continuously. 1Cr-ZGO exhibits the best microwave dielectric properties, with er, Q f, tand and tf being 9.88 (@9.9 GHz), 111 470 GHz, 8.87, and 74 ppm ⁰C-¹ , respectively. The Q f value was increased by almost 40% compared with the pure ZGO ceramics (B80 000 GHz). The enhancement of er and Q f values of Cr-ZGO can be attributed to the better bulk density, but further analysis by Rietveld refinement, Raman spectroscopy and FT-IR spectroscopy elucidated that the octahedral tilting in the spinel structure and the degree of short-range cation distribution are other governing factors. The effect of Cr³⁺ substitution for Ga³⁺ on the octahedral distortion and cation distribution in the spinel structure has been discussed in detail.
URI: https://hdl.handle.net/10356/151490
ISSN: 2050-7526
DOI: 10.1039/C9TC01959F
Rights: © 2019 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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