Correlation between crystal structure and microwave dielectric properties of CaRE4Si3O13 (RE = La, Nd, Sm, and Er)
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Novel CaRE4Si3O13 (RE = La, Nd, Sm, and Er) microwave dielectric ceramics were prepared using solid-state reaction sintered at 1350–1400 °C for 5 h. CaRE4Si3O13 (RE = La, Nd, Sm, and Er) possessed an apatite structure with the P63/m space group. The lattice parameters a, b and c; theoretical density and unit cell volumes of CaRE4Si3O13 (RE = La, Nd, Sm, and Er) gradually decreased when RE changed from La to Er, and a pure phase was formed at all compositions. The εr, Q × f, and τf values of the CaRE4Si3O13 (RE = La, Nd, Sm, and Er) ceramics were related to the total ionic polarizability, packing fraction, and polyhedral distortion of RE/Ca(2)O7, respectively. The optimal microwave dielectric properties of the CaRE4Si3O13 ceramics (εr = 13.37, Q × f = 18,600 GHz, and τf = − 17.8 ppm/°C) were obtained at RE = Er.
This work was supported by the National Natural Science Foundation of China (NSFC-51572093 and 51772107), Research Projects of Electronic Components and Devices of China (1807WM0004), the Major Programs of Technical Innovation in Hubei Province of China (2018AAA039), and the Innovation Team Program of Hubei Province (New microwave devices for next generation wireless communication systems).
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