Lin Cao , Yuanyuan Wang , Xueqing Yu , Zhilun Lu , Ge Wang , Minmin Mao , Bing Liu , Lei Cao , Hadi Barzegar Bafrooei , Matjaz Spreitzer , Dawei Wang , Kaixin Song
{"title":"Significantly enhanced microwave-millimeterwave properties of cordierite ceramics: Roundness regulation of Si-Al hexagonal ring, analysis of far-infrared reflectance and terahertz time-domain spectroscopy","authors":"Lin Cao , Yuanyuan Wang , Xueqing Yu , Zhilun Lu , Ge Wang , Minmin Mao , Bing Liu , Lei Cao , Hadi Barzegar Bafrooei , Matjaz Spreitzer , Dawei Wang , Kaixin Song","doi":"10.1016/j.jeurceramsoc.2024.117045","DOIUrl":null,"url":null,"abstract":"<div><div>Ultra-low permittivity (<em>ε</em><sub><em>r</em></sub>:4–5) Mg<sub>2</sub>Al<sub>4–<em>x</em></sub>(Ge<sub>0.5</sub>Mg<sub>0.5</sub>)<sub><em>x</em></sub>Si<sub>5</sub>O<sub>18</sub> (0.12 ≤ <em>x</em> ≤ 0.28) and Mg<sub>2</sub>Al<sub>4–<em>y</em></sub>(Mn<sub>0.5</sub>Mg<sub>0.5</sub>)<sub><em>y</em></sub>Si<sub>5</sub>O<sub>18</sub> (0.1 ≤ <em>y</em> ≤ 0.3) cordierite ceramics were fabricated by solid-state reaction method. The improvement in [(Si<sub>4</sub>Al<sub>2</sub>)O<sub>18</sub>] hexahedral ring roundness significantly enhances the quality factor through the substitution of complex ionic pairs of Ge<sub>0.5</sub>Mg<sub>0.5</sub>/Mn<sub>0.5</sub>Mg<sub>0.5</sub> for Al lattice sites in the [(Si<sub>4</sub>Al<sub>2</sub>)O<sub>18</sub>] hexahedral ring of these cordierite ceramics. Excellent microwave dielectric performances of Mg<sub>2</sub>Al<sub>3.8</sub>(Ge<sub>0.5</sub>Mg<sub>0.5</sub>)<sub>0.2</sub>Si<sub>5</sub>O<sub>18</sub> and Mg<sub>2</sub>Al<sub>3.8</sub>(Mn<sub>0.5</sub>Mg<sub>0.5</sub>)<sub>0.2</sub>Si<sub>5</sub>O<sub>18</sub> ceramics sintered at 1400 °C were demonstrated using the Hakki-Coleman resonant method with <em>ε</em><sub><em>r</em></sub> = 4.676, <em>Q×f</em> = 186, 503 [email protected] GHz and 199,476 GHz @ 27.434 GHz, <em>τ</em><sub><em>f</em></sub> = −20.02 ppm/°C and <em>ε</em><sub><em>r</em></sub> = 4.807, <em>Q×f</em> = 101,420 [email protected] GHz and 143,005 GHz @ 27.366 GHz, <em>τ</em><sub><em>f</em></sub> = −26.44 ppm/°C, respectively. These results present the potential application of high-quality cordierite in future B5G/6 G millimeter and terahertz communication frequency bands.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The European Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S095522192400918X","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
Ultra-low permittivity (εr:4–5) Mg2Al4–x(Ge0.5Mg0.5)xSi5O18 (0.12 ≤ x ≤ 0.28) and Mg2Al4–y(Mn0.5Mg0.5)ySi5O18 (0.1 ≤ y ≤ 0.3) cordierite ceramics were fabricated by solid-state reaction method. The improvement in [(Si4Al2)O18] hexahedral ring roundness significantly enhances the quality factor through the substitution of complex ionic pairs of Ge0.5Mg0.5/Mn0.5Mg0.5 for Al lattice sites in the [(Si4Al2)O18] hexahedral ring of these cordierite ceramics. Excellent microwave dielectric performances of Mg2Al3.8(Ge0.5Mg0.5)0.2Si5O18 and Mg2Al3.8(Mn0.5Mg0.5)0.2Si5O18 ceramics sintered at 1400 °C were demonstrated using the Hakki-Coleman resonant method with εr = 4.676, Q×f = 186, 503 [email protected] GHz and 199,476 GHz @ 27.434 GHz, τf = −20.02 ppm/°C and εr = 4.807, Q×f = 101,420 [email protected] GHz and 143,005 GHz @ 27.366 GHz, τf = −26.44 ppm/°C, respectively. These results present the potential application of high-quality cordierite in future B5G/6 G millimeter and terahertz communication frequency bands.
期刊介绍:
The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.