Scholarlink

<p>The Na<sub>5</sub>Tm<sub>1 − x</sub>(Y<sub>1/3</sub>Yb<sub>2/3</sub>)<sub>x</sub>(MoO<sub>4</sub>)<sub>4</sub> ceramics (x=0-0.18) were successfully synthesized via the solid-state reaction method. XRD analysis revealed that they possessed a single-phase tetragonal scheelite structure belonging to the space group I4₁/a(88). SEM analysis demonstrated that the samples sintered at 600&#xa0;°C exhibited a dense microstructure, with a relative density as high as 94.9% and an average grain size ranging from 2.172&#xa0;μm to 2.424&#xa0;μm. The relative density serves as an external factor influencing ε<sub>r</sub> and Q×f, while τ<sub>f</sub> is related to bond valence. The ionicity of the Tm-O bond, and the lattice energy and bond energy of the Mo-O bond are the intrinsic factors determining ε<sub>r</sub>, Q×f, and τ<sub>f</sub>, respectively. Raman spectroscopy provided an intuitive characterization of the vibrational properties of the [MoO<sub>4</sub>]<sup>2−</sup> tetrahedra within the ceramics. Although the pure phase Na₅Tm(MoO<sub>4</sub>)<sub>4</sub> ceramic exhibited optimal dielectric properties (ε<sub>r</sub>=8.025, Q×f=18,967&#xa0;GHz, and τ<sub>f</sub> = -101 ppm/°C) at 625&#xa0;°C, the Na<sub>5</sub>Tm<sub>0.91</sub>Y<sub>0.03</sub>Yb<sub>0.06</sub>(MoO<sub>4</sub>)<sub>4</sub> ceramic sintered at 600&#xa0;°C demonstrated superior dielectric properties (ε<sub>r</sub>=7.82, Q×f=34,752&#xa0;GHz, and τ<sub>f</sub> = -71.9 ppm/°C).</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Raman spectra and microwave dielectric properties of Na5Tm1 − x(Y1/3Yb2/3)x(MoO4)4 ceramics with ultra-low sintering temperature

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月24日

查看全文
  • Yuan-Bin Chen,
  • Siyi Xiong

摘要

The Na5Tm1 − x(Y1/3Yb2/3)x(MoO4)4 ceramics (x=0-0.18) were successfully synthesized via the solid-state reaction method. XRD analysis revealed that they possessed a single-phase tetragonal scheelite structure belonging to the space group I4₁/a(88). SEM analysis demonstrated that the samples sintered at 600 °C exhibited a dense microstructure, with a relative density as high as 94.9% and an average grain size ranging from 2.172 μm to 2.424 μm. The relative density serves as an external factor influencing εr and Q×f, while τf is related to bond valence. The ionicity of the Tm-O bond, and the lattice energy and bond energy of the Mo-O bond are the intrinsic factors determining εr, Q×f, and τf, respectively. Raman spectroscopy provided an intuitive characterization of the vibrational properties of the [MoO4]2− tetrahedra within the ceramics. Although the pure phase Na₅Tm(MoO4)4 ceramic exhibited optimal dielectric properties (εr=8.025, Q×f=18,967 GHz, and τf = -101 ppm/°C) at 625 °C, the Na5Tm0.91Y0.03Yb0.06(MoO4)4 ceramic sintered at 600 °C demonstrated superior dielectric properties (εr=7.82, Q×f=34,752 GHz, and τf = -71.9 ppm/°C).