钒取代对 LaTaO4 陶瓷微观结构和微波介电性能的影响

doi:10.15541/jim20240482

无机材料学报

• 研究论文 • 下一篇

钒取代对 LaTaO₄ 陶瓷微观结构和微波介电性能的影响

李文元^1,2, 徐佳楠^1,2, 邓瀚澳¹, 常爱民¹, 张博¹

1.中国科学院新疆理化技术研究所,特殊环境条件功能材料与器件重点实验室,新疆电子信息材料与器件重点实验室,乌鲁木齐 830011;
2.中国科学院大学材料科学与光电技术学院,北京 100049

收稿日期:2024-11-13 修回日期:2024-12-31
作者简介:李文元 (1999-), 男, 博士研究生. E-mail: liwenyuan22@mails.ucas.ac.cn。
基金资助:
国家自然科学基金 (62471468); 中国科学院青年创新促进会项目 (Y2023117); 新疆自然科学基金 (2024D01E32)新疆天山英才培养计划 (2023TSYCCX0092)

Effects of V⁵⁺ Substitution on Microstructure and Microwave Dielectric Properties of LaTaO₄ Ceramics

LI Wenyuan^1,2, XU Jianan^1,2, DENG Hanao¹, CHANG Aimin¹, ZHANG Bo¹

1. State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China;
2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2024-11-13 Revised:2024-12-31
About author:LI Wenyuan (1999-), male, PhD candidate. E-mail: liwenyuan22@mails.ucas.ac.cn.
Supported by:
National Natural Science Foundation of China (62471468); Youth Innovation Promotion Association of CAS (Y2023117); Natural Science Foundation of Xinjiang (2024D01E32); Xinjiang Tianshan Talent Training Program (2023TSYCCX0092)

摘要/Abstract

摘要： 微波介质陶瓷是5G/6G通信技术的关键材料,广泛应用于谐振器、滤波器、介质基板等电子元器件。随着无线移动通信频率的不断提升,对微波介质陶瓷提出了更高要求,特别是需要更高的品质因数和接近零的谐振频率温度系数,以有效补偿高频信号在传输过程中的迅速衰减,并提高其工作稳定性。本研究采用固相烧结法制备了La(Ta_1-_xV_x)O₄(LTV-x,0 ≤ x ≤ 0.4)陶瓷,并通过晶体结构精修、透射电子显微镜和微波介电测试,研究了其结构和介电性能。在该体系中合成了两种具有优异微波介电性能的La(Ta_1-_xV_x)O₄陶瓷,分别为LTV-0.3(ε_r = 22.15,Q×f = 90100 GHz,τ_f = -9.52×10^-6/℃)和LTV-0.4(ε_r = 21.75,Q×f = 84100 GHz,τ_f= -4.5×10^-6/℃)陶瓷。研究发现,V⁵⁺取代诱导了单斜相(P21/c)向四方相(I41/amd)(x ≥ 0.2)的转变,并有效降低了相变温度。随着x的增加,介电常数(ε_r)和谐振频率温度系数(τ_f)均呈下降趋势。Q×f 值不仅与相对密度有关,还与晶胞的堆积分数有关。鉴于其低损耗和良好温度稳定性,该系列陶瓷材料在移动通信基站、卫星导航和雷达通信等领域展现出良好的应用前景。

关键词: LaTaO₄, 微波介电性能, 谐振频率温度系数, 离子取代, 填充分数

Abstract: Microwave dielectric ceramics are essential materials for 5G/6G communication technology and are primarily employed in the fabrication of electronic components such as resonators, filters and dielectric substrates. With the increasing frequency of wireless mobile communication, it is necessary to develop microwave dielectric ceramics with higher quality factor and near-zero temperature coefficient of resonance frequency, thus effectively compensating for the rapid attenuation of high-frequency signals in the transmission process and enhancing the stability of their operation. Consequently, La(Ta_1-_xV_x)O₄ (LTV-x, 0 ≤ x ≤ 0.4) ceramics were prepared by solid-phase sintering. The structure and dielectric properties of the ceramics were investigated using crystal structure refinement, transmission electron microscopy and microwave dielectric property measurements. Two specific compositions of La(Ta_1-_xV_x)O₄ ceramics with excellent microwave dielectric properties were synthesized in this system, namely LTV-0.3 (ε_r = 22.15, Q×f = 90100 GHz, τ_f = -9.52 ×10^-6/℃) and LTV-0.4 (ε_r = 21.75, Q×f = 84100 GHz, τ_f = -4.5×10^-6/℃) ceramics. Results indicate that V⁵⁺ substitution induces the phase transition from monoclinic (P21/c) to tetragonal (I41/amd) (x ≥ 0.2) phases, while the phase transition temperature is effectively reduced. In addition, the dielectric constant (ε_r) and the temperature coefficient of resonance frequency (τ_f) decrease with increasing x due to phase transition. The Q×f values are influenced not only by the relative density but also by the packing fraction of the crystal cell. Considering their low loss and good temperature stability, these ceramic materials demonstrate promising potential for applications in mobile communication base stations, satellite navigation and radar communication technologies.

Key words: LaTaO₄, microwave dielectric properties, temperature coefficient of resonant frequency, ionic substitution, packing fraction

中图分类号:

TQ174

李文元, 徐佳楠, 邓瀚澳, 常爱民, 张博. 钒取代对 LaTaO₄ 陶瓷微观结构和微波介电性能的影响[J]. 无机材料学报, DOI: 10.15541/jim20240482.

LI Wenyuan, XU Jianan, DENG Hanao, CHANG Aimin, ZHANG Bo. Effects of V⁵⁺ Substitution on Microstructure and Microwave Dielectric Properties of LaTaO₄ Ceramics[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20240482.

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钒取代对 LaTaO₄ 陶瓷微观结构和微波介电性能的影响

Effects of V⁵⁺ Substitution on Microstructure and Microwave Dielectric Properties of LaTaO₄ Ceramics

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