新型Dy_(2)TiO_(5)微波介质陶瓷的制备及其性能分析  

Synthesis and Properties of Novel Dy_(2)TiO_(5)Microwave Dielectric Ceramics

作　　者：朱国斌 李纯纯[1,2] 熊思宇 朱肖伟 陈德钦 刘来君 施晓东[1] ZHU Guobin;LI Chunchun;XIONG Siyu;ZHU Xiaowei;CHEN Deqin;LIU Laijun;SHI Xiaodong(School of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China;School of Electronic Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004 [2]西安交通大学电子科学与工程学院,陕西西安710049

出　　处：《宁夏大学学报(自然科学版中英文)》2025年第1期90-96,共7页Journal of Ningxia University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(62061011)。

摘　　要：微波介质陶瓷具有优异的介电性能,是制造高性能通信器件的关键材料,被广泛用于制备滤波器、谐振器等,以满足通信设备小型化、轻量化的需求.采用常规固相反应法,在烧结温度为1400~1500℃成功合成出纯相Dy_(2)TiO_(5)微波介质陶瓷.研究不同烧结温度对Dy_(2)TiO_(5)陶瓷的晶体结构、致密度、微观形貌及介电性能的影响.结果表明,在1475℃下烧结的Dy_(2)TiO_(5)陶瓷具有最佳的致密度(94.3%)和均匀的微观结构,其相对介电常数(ε_(r))为29.19,品质因数(Q×f)高达13829 GHz,谐振频率温度系数(τ_(f))为-19.4×10^(-6)℃^(-1).此外,通过介电温谱、热膨胀实验和远红外光谱系统分析Dy_(2)TiO_(5)陶瓷的介电性能随着温度和频率的变化规律.结果表明,孔隙度对Dy_(2)TiO_(5)陶瓷的介电常数影响显著,而离子极化率是决定Dy_(2)TiO_(5)陶瓷介电性能的关键内在因素,Dy_(2)TiO_(5)陶瓷在微波介质材料领域具有广阔的应用前景.Microwave dielectric ceramics,renowned for their superior dielectric properties,are pivotal materials for manufacturing high-performance communication components such as filters and resonators,addressing the demands for miniaturization and integration in modern devices.In this study,pure-phase Dy_(2)TiO_(5)microwave dielectric ceramics were synthesized via a conventional solid-state reaction method at sintering temperatures ranging from 1400 to 1500℃.The effects of sintering temperature on the crystal structure,relative density,microstructure,and dielectric properties were systematically investigated.Results indicate that Dy_(2)TiO_(5)ceramics sintered at 1475℃exhibit optimal performance with a high relative density of 94.3%,homogeneous microstructure,and excellent dielectric properties:a relative permittivity(ε_(r))of 29.19,a quality factor(Q×f)of 13,829 GHz,and a temperature coefficient of resonant frequency(τ_(f))of-19.4×10^(6)℃^(-1).Furthermore,temperature-and frequency-dependent dielectric behavior was analyzed through dielectric spectroscopy,thermal expansion measurements,and far-infrared spectroscopy.Key findings reveal that porosity significantly influences the dielectric constant,while ionic polarizability serves as the intrinsic determinant of dielectric performance.These results demonstrate the promising potential of Dy_(2)TiO_(5)ceramics for microwave dielectric applications.

关 键 词：Dy_(2)TiO_(5)陶瓷 稀土钛酸盐 固相烧结 介电性能 远红外 

分 类 号：TU43[建筑科学—岩土工程] O344[建筑科学—土工工程]