高熵（MgxCa0.6-xSr0.39Ba0.01）ZrO3陶瓷的微波介电性能与微观结构

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2025-05-02 DOI:10.1016/j.oceram.2025.100793

Huei-Jyun Shih , Chin-Tung Shih , Ying-Chieh Lee

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引用次数: 0

摘要

研究了不同烧结温度下MgxCa0.6-xSr0.39Ba0.01ZrO3 （x = 0.01, 0.03, 0.05）陶瓷的固相合成与表征。结果表明：随着MgO掺杂量的增加和烧结温度的升高，陶瓷的体积密度增大，MgO的烧结增强效果显著；然而，过量的MgO掺杂超过了溶解度极限，导致密度降低和二次相的形成。介电测量表明，当MgO掺杂浓度达到1%时，介电常数增加，但在较高浓度时介电常数降低。在1350°C下烧结的陶瓷具有最佳的介电性能，其中介电常数高达32.98，在8-9 GHz处的Q × f值为22,012。这些结果表明，由于Mg作为第五阳离子掺杂，在高频下具有最小损耗的稳定介电性能。这种行为表明介电弛豫与高熵效应有关。

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Microwave dielectric properties and microstructure of high entropy (MgxCa0.6-xSr0.39Ba0.01)ZrO3 ceramics

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Microwave dielectric properties and microstructure of high entropy (MgxCa0.6-xSr0.39Ba0.01)ZrO3 ceramics

The synthesis and characterization of Mg_xCa_0.6-xSr_0.39Ba_0.01ZrO₃ (x = 0.01, 0.03, and 0.05) ceramics using the solid-state method was investigated at varying sintering temperatures in this study. The results show that increasing MgO doping and higher sintering temperatures enhance the ceramic’s bulk density, highlighting the sintering enhancement effect of MgO. However, excessive MgO doping exceeds the solubility limit, resulting in reduced density and the formation of secondary phases. Dielectric measurements reveal that the dielectric constant increases with MgO doping up to 1 % but decreases at higher concentrations. Ceramics sintered at 1350 °C exhibit optimal dielectric properties, including a high permittivity of 32.98 and a Q × f value of 22,012 at 8–9 GHz. These results demonstrate stable dielectric performance with minimal loss at high frequency due to Mg doping as a fifth cation. This behavior suggests that dielectric relaxation is associated with the high entropy effect.

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