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 ε_r, Q × f, and τ_f 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 (ε_r = 13.37, Q × f = 18,600 GHz, and τ_f = − 17.8 ppm/°C) were obtained at RE = Er.

中文翻译：

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CaRE 4 Si 3 O 13（RE = La，Nd，Sm和Er）的晶体结构与微波介电性能之间的相关性

新型Ca RE ₄ Si ₃ O ₁₃（RE = La，Nd，Sm和Er）微波介电陶瓷是通过在1350–1400°C下烧结5 h的固态反应制备的。CaRE ₄ Si ₃ O ₁₃（RE = La，Nd，Sm和Er）具有P 6 ₃ / m空间群的磷灰石结构。晶格参数a，b和c ; 当RE从La变为Er时，CaRE ₄ Si ₃ O ₁₃（RE = La，Nd，Sm和Er）的理论密度和单位晶胞体积逐渐减小，并且在所有组成下均形成了纯相。的ε _{- [R} ，Q  ×  ˚F，和τ _˚F护理的值₄的Si ₃ ö ₁₃（RE =镧，钕，钐，和Er）陶瓷进行了相关的总离子极化，包装部分，以及多面体失真RE /钙（2）O ₇。护理的最佳微波介电性能₄的Si ₃ ö ₁₃陶瓷（ε _{- [R}  = 13.37，Q  ×  ˚F  = 18600千兆赫，和τ _˚F 在RE =尔得到- 17.8 PPM /°C =）。