Herein, Li2MgxZrO3+x (x = 0–1) +2 wt.% LiF ceramics with a rock salt structure were prepared by the solid‐state reaction method. The phase transition mechanism was systematically investigated by X‐ray diffraction, and first‐principles calculations. With a gradual increase in MgO content, the samples underwent a monoclinic‐Li2ZrO3 to tetragonal‐Li2ZrO3 to tetragonal‐Li2MgZrO4 to cubic‐phase transition. The variations of the microwave dielectric properties due to the phase transition were systematically analyzed by the multi‐phase mixtures law. In addition, CO2 adsorption of the samples was quantitatively analyzed by X‐ray photoelectron spectroscopy, and the long‐term stability of the Q × f of the samples was investigated. The optimal microwave dielectric properties were obtained in Li2Mg0.2ZrO3.2 ceramic at 950°C: εr = 19.5, Q × f = 44 500 GHz, and τf = 2.6 ppm/°C. In addition, the ceramic samples were compatible with Ag, which indicates that Li2MgxZrO3+x (x = 0−1) +2 wt.% LiF is a promising material for low‐temperature co‐fired ceramics.

中文翻译：

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LiF辅助烧结Li2MgxZrO3+x微波介电陶瓷的相变机制及长期稳定性

在此，李2镁X氧化锆3+X（X= 0–1) +2 wt.% 采用固相反应法制备了具有岩盐结构的 LiF 陶瓷。通过X射线衍射和第一性原理计算系统地研究了相变机制。随着 MgO 含量的逐渐增加，样品经历了单斜 Li2氧化锆3至四方-Li2氧化锆3至四方-Li2氧化镁4到立方相变。利用多相混合定律系统地分析了相变引起的微波介电性能的变化。此外，一氧化碳2采用X射线光电子能谱对样品的吸附情况进行定量分析，并对样品的长期稳定性进行了分析。问×F的样品进行了调查。Li获得了最佳的微波介电性能2镁0.2氧化锆3.2950°C 陶瓷：εr= 19.5，问×F= 44 500 GHz，并且τF= 2.6 ppm/°C。此外，陶瓷样品与Ag相容，这表明Li2镁X氧化锆3+X（X= 0−1) +2 wt.% LiF 是一种有前途的低温共烧陶瓷材料。