Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7886824 | Ceramics International | 2018 | 7 Pages |
Abstract
In current study, only 5â¯mol% Mn2+ was applied to fabricate high performance microwave dielectric ZnGa2O4 ceramics, via a traditional solid state method. The crystal structure, cation distribution and microwave dielectric properties of as-fabricated Mn-substituted ZnGa2O4 ceramics were systematically investigated. Mn2+-substitution led to a continuous lattice expansion. Raman, EPR and crystal structure refinement analysis suggest that Mn2+ preferentially occupies the tetrahedral site and the compounds stay normal-spinel structure. The experimental and theoretical dielectric constant of Zn1-xMnxGa2O4 ceramics fit well. In all, this magnetic ion, Mn2+, could effectively adjust the Ïf value to near zero and double the quality factor from 85,824â¯GHz to 181,000â¯GHz of Zn1-xMnxGa2O4 ceramics at the meantime. Zn1-xMnxGa2O4 (xâ¯=â¯0.05) ceramics sintered at 1400â¯Â°C for 2â¯h exhibited excellent microwave dielectric properties, with εr =â¯9.7(@9.85â¯GHz), Qâ¯Ãâ¯fâ¯=â¯181,000â¯GHz, tanδâ¯=â¯5.44â¯Ãâ¯10â5,and Ïf =â¯ââ¯12â¯ppm/°C.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xiaochi Lu, Wenjie Bian, Chengfa Min, Zhenxiao Fu, Qitu Zhang, Haikui Zhu,