Publication Date:
2020
Description:
〈p〉Publication date: 15 March 2020〈/p〉
〈p〉〈b〉Source:〈/b〉 Materials Letters, Volume 263〈/p〉
〈p〉Author(s): Huanfu Zhou, Chengming Lu, Shixuan Li, Jiji Deng, Kangguo Wang〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉Novel Ca〈sub〉3〈/sub〉Al〈sub〉2〈/sub〉(GeO〈sub〉4〈/sub〉)〈sub〉3〈/sub〉 microwave dielectric ceramic with high 〈em〉Q〈/em〉 was prepared by a conventional solid-phase reaction method. X-ray diffraction patterns (XRD) and X-ray Photoelectron Spectroscopy (XPS) analysis shown that the ceramic was a single garnet phase with parameters of 〈em〉a〈/em〉 = 〈em〉b〈/em〉 = 〈em〉c〈/em〉 = 12.11845(16)Å, 〈em〉V〈/em〉 = 1779.625(69) Å〈sup〉3〈/sup〉 and 〈em〉Z〈/em〉 = 8. As the sintering temperature increased from 1250 °C to 1350 °C, the bulk density (〈em〉ρ〈/em〉), relative permittivity (〈em〉ε〈sub〉r〈/sub〉〈/em〉) and quality factor (〈em〉Q × f〈/em〉) values increased first, reached a maximum value and then decreased. The temperature coefficient of resonator frequency (〈em〉τ〈sub〉f〈/sub〉〈/em〉) varied slightly in a small negative range from −15 to –22 ppm/°C. The Ca〈sub〉3〈/sub〉Al〈sub〉2〈/sub〉(GeO〈sub〉4〈/sub〉)〈sub〉3〈/sub〉 ceramic sintered at 1325 °C exhibited the best microwave dielectric properties of 〈em〉ε〈sub〉r〈/sub〉〈/em〉 = 7.6, 〈em〉Q × f〈/em〉 = 104,100 GHz and 〈em〉τ〈sub〉f〈/sub〉〈/em〉 = −15 ppm/°C, showing that it is a good candidate for microwave devices with low dielectric loss.〈/p〉〈/div〉
〈/div〉
Print ISSN:
0167-577X
Electronic ISSN:
1873-4979
Topics:
Chemistry and Pharmacology
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Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
