Order-Disorder Phase Transition and Magneto-Dielectric Properties of (1-x)LiFe5O8-xLi2ZnTi3O8Spinel-Structured Solid Solution Ceramics
Order-Disorder Phase Transition and Magneto-Dielectric Properties of (1-x)LiFe5O8-xLi2ZnTi3O8Spinel-Structured Solid Solution Ceramics
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(1-x)LiFe5O8-xLi2ZnTi3O8尖晶石结构固溶体陶瓷的有序无序相变和磁介电性能
DOI：
10.1111/jace.13547
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发表时间：
2015
影响因子：
3.9
通讯作者：
Wang Hong
中科院分区：
文献类型：
--
作者：
He Li;Mi Shao-Bo;Jin Xiaowei;Zhang Hui;Zhou Di;Xiang Feng;Yang Haibo;Wang Hong
本文采用固相反应法制备了尖晶石型（1−x）LiFe 5 O 8-xLi 2 ZnTi 3 O 8（0 ≤x≤ 1）固溶体陶瓷。系统地研究了材料的相演变、烧结行为、显微结构、磁介电性能和微波介电性能。XRD和SEM分析表明，LiFe 5 O 8相和Li 2 ZnTi 3 O 8相几乎完全互溶。同时，通过扫描透射电子显微镜在原子尺度上直接观察到了离子取代的证据，并通过拉曼光谱进一步证实了这一点。有证据表明，磁性和介电性能是相当敏感的组成。在0.25LiFe5O8- 0.75Li2ZnTi3O8样品中，得到了最佳的磁介电性能：μ′ = 38.2，tanδμ= 0.25，ε′ = 19.6，tanδε= 8 × 10− 3（1 MHz），ε′ = 19.1，Q ×f= 10400 GHz（7 GHz）.复合尖晶石固溶体的设计可以生成兼具高磁导率和良好介电性能的新型磁介电单相陶瓷，这为开发电子器件应用的多功能材料提供了一种途径。
In this study, the spinel solid solution ceramics (1−x)LiFe5O8–xLi2ZnTi3O8(0 ≤x≤ 1) were prepared via the solid‐state reaction method. The phase evolution, sintering behaviors, microstructures, magneto‐dielectric properties, and microwave dielectric properties were systematically investigated. The XRD and SEM analysis indicated that the LiFe5O8phase and the Li2ZnTi3O8phase were almost fully soluble in each other at any proportion. Meanwhile, the evidence of ionic substitution has been directly observed at the atomic scale by means of scanning transmission electron microscopy, which is further confirmed by the Raman spectroscopy. Evidence shows that the magnetic and dielectric properties are quite sensitive to the compositions. The optimal results with remarkable magneto‐dielectric properties of μ′ = 38.2, tanδμ= 0.25, ε′ = 19.6, tanδε= 8 × 10−3at 1 MHz, and ε′ = 19.1,Q×f= 10 400 GHz at about 7 GHz have been obtained in 0.25LiFe5O8–0.75Li2ZnTi3O8sample. The design of complex spinel solid solution can generate novel magneto‐dielectric single‐phase ceramics combining both high permeability and good dielectric properties, which provides a way in developing multifunctional materials for applications in electronic devices.