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- Title
The apparent difference in microwave dielectric properties of Ca<sub>3</sub>MZnGe<sub>3</sub>O<sub>12</sub> (M = Zr, Sn) garnets originating from compression and rattling effects.
- Authors
Wang, Zhaohui; Fang, Weishuang; Tang, Ying; Xiang, Huaicheng; Li, Jie; Fang, Liang
- Abstract
Ca3MZnGe3O12 (M = Zr, Sn) ceramics crystallized in a cubic garnet structure (A3B2C3O12) with a space group of Ia-3d, and promising microwave dielectric properties with low coefficients of thermal expansion (αL) were obtained, namely, εr = 10.5 and 9.3, Q × f = 79,700, and 96,040 GHz, τf = − 36.1 and − 61.5 ppm/°C, and αL = 4.3 and 4.7 ppm/°C for Ca3ZrZnGe3O12 and Ca3SnZnGe3O12, respectively. Bond valence calculation reveals that Ca3SnZnGe3O12 exhibits a slight "compressed" effect at A-site and B-site with a slightly negative deviation (Δεr ~ − 1.01%) of the porosity corrected εr(corr) from theoretical εr(C–M) calculated by the C–M equation, while Ca3ZrZnGe3O12 shows a "rattling" effect at the A-site and C-site with a large positive Δεr ~ 15.8%, leading to a high εr, a more close to zero τf and a lower Q × f value as compared to those of Ca3SnZnGe3O12. The relationship between structure and their intrinsic microwave dielectric properties was investigated by complex chemical bond theory and far-infrared reflectivity spectra.
- Subjects
DIELECTRIC properties; MICROWAVES; VALENCE bonds; CHEMICAL bonds; GARNET; SPACE groups
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 26, p21101
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-08913-3