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<p>In this study, Sr<sup>2+</sup> was employed to substitute Ca<sup>2+</sup> in KCaPr(MoO<sub>3</sub>)<sub>4</sub> ceramics. Such ion substitution was found to effectively enhance the Q × f value of KCaPr(MoO<sub>3</sub>)<sub>4</sub> and moderately decrease its sintering temperature. Scanning electron microscopy (SEM) observations and density measurements indicated satisfactory sintering characteristics of this series of ceramics. Meanwhile, X-ray diffraction (XRD) and Raman spectroscopy analyses suggested the formation of a solid solution without obvious secondary phases or impurities, verifying the successful preparation of single-phase molybdate ceramics. On the basis of P–V–L theoretical analysis, it was suggested that K/Ca/Pr–O bonds mainly contribute to the bond ionicity (fᵢ), whereas Mo–O bonds exert considerable influences on the lattice energy (U), bond energy (E), and thermal expansion coefficient (α). Among the as-prepared ceramic samples, KCa<sub>0.98</sub>Sr<sub>0.02</sub>Pr(MoO<sub>3</sub>)<sub>4</sub> exhibited the most favorable dielectric properties at 700 ℃ with a relative permittivity (εᵣ) of 10.744, a quality factor-frequency product (Q × <i>f</i>) of 89 349&#xa0;GHz, and a temperature coefficient of resonant frequency (τ<sub><i>f</i></sub>) of − 59.947&#xa0;ppm/&#xa0;&#xa0;C. Benefiting from the ion substitution strategy, the obtained materials possessed relatively low sintering temperatures and high Q × <i>f</i> values, suggesting promising potential for application in ultra-low-temperature co-fired ceramics (ULTCC).</p>

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Effect of Sr2+ substitution on crystal structure, Raman characteristics and microwave dielectric properties of KCa1-xSrxPr(MoO3)4 ceramics for ULTCC applications

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Xiuyuan Su,
  • Yuan-Bin Chen,
  • Junyu Chen,
  • Shijie Ma,
  • Haiqiang Lin

摘要

In this study, Sr2+ was employed to substitute Ca2+ in KCaPr(MoO3)4 ceramics. Such ion substitution was found to effectively enhance the Q × f value of KCaPr(MoO3)4 and moderately decrease its sintering temperature. Scanning electron microscopy (SEM) observations and density measurements indicated satisfactory sintering characteristics of this series of ceramics. Meanwhile, X-ray diffraction (XRD) and Raman spectroscopy analyses suggested the formation of a solid solution without obvious secondary phases or impurities, verifying the successful preparation of single-phase molybdate ceramics. On the basis of P–V–L theoretical analysis, it was suggested that K/Ca/Pr–O bonds mainly contribute to the bond ionicity (fᵢ), whereas Mo–O bonds exert considerable influences on the lattice energy (U), bond energy (E), and thermal expansion coefficient (α). Among the as-prepared ceramic samples, KCa0.98Sr0.02Pr(MoO3)4 exhibited the most favorable dielectric properties at 700 ℃ with a relative permittivity (εᵣ) of 10.744, a quality factor-frequency product (Q × f) of 89 349 GHz, and a temperature coefficient of resonant frequency (τf) of − 59.947 ppm/  C. Benefiting from the ion substitution strategy, the obtained materials possessed relatively low sintering temperatures and high Q × f values, suggesting promising potential for application in ultra-low-temperature co-fired ceramics (ULTCC).