Sintering process, phase composition, and microwave dielectric properties of NaLn(WO4)2(ln = La, Nd, Sm) ceramics prepared by reaction sintering method

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2023-08-08 DOI:10.1007/s10832-023-00329-7

Haiqing Deng, Xin Qu, Yinghan He, Xiaoli Wei, You Wu, Xiuli Chen, Huanfu Zhou

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Abstract

Novel ultra-low loss NaLn(WO₄)₂ (Ln = La (NLW), Nd (NNW), Sm (NSW)) (NLnW) microwave dielectric ceramics were prepared by a reaction sintering method. The sintering process of the samples was investigated by TG-DSC. XRD refinement and Raman spectra results ascertained that the NLnW ceramics have scheelite structure with space group of I4₁/a. The microwave dielectric properties of NLnW ceramics and the relationship between the structure and performances were studied. The relationship between lattice vibration and Qf were analyzed by Raman spectroscopy. Especially, the NSW ceramics sintered at 1100 ℃ for 4 h show outstanding microwave dielectric properties of ε_r = 10.07, Qf = 73,734 GHz (at 12.21 GHz), τ_f = -42.6 ppm/°C, which providing a promising application in fifth generation communications.

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NaLn（WO4）2（ln）的烧结工艺、相组成和微波介电性能 = La，Nd，Sm）陶瓷的反应烧结制备

采用反应烧结法制备了新型超低损耗 NaLn(WO4)2（Ln = La (NLW)、Nd (NNW)、Sm (NSW)）（NLnW）微波介质陶瓷。通过 TG-DSC 对样品的烧结过程进行了研究。XRD 精炼和拉曼光谱结果表明，NLnW 陶瓷具有白钨矿结构，空间群为 I41/a。研究了无卤素陶瓷的微波介电性能以及结构与性能之间的关系。拉曼光谱分析了晶格振动与 Qf 之间的关系。尤其是在 1100 ℃ 下烧结 4 小时的 NSW 陶瓷显示出卓越的微波介电性能：εr = 10.07、Qf = 73,734 GHz（12.21 GHz 时）、τf = -42.6 ppm/°C，有望应用于第五代通信。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.