Near-zero temperature coefficient in Mg2+–Ti4+ co-doped Sm2O3–CaSmAlO4 microwave dielectric ceramics

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-07-20 DOI:10.1007/s12598-024-02918-z

Jin-Quan Zeng, Jun-Lei Qi, Yue-Yang Yang, Min-Hao Zhang, Yuan-Hua Lin

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Abstract

The practical application of CaSmAlO₄ microwave dielectric ceramics is limited by its low quality factor (Q×f) value and non-zero temperature coefficient resonant frequency (τ_f) value. In this study, we introduced Mg²⁺–Ti⁴⁺ ionic pairs into CaSmAlO₄, along with an excess of 9% Sm₂O₃. The Mg²⁺–Ti⁴⁺ ionic pairs substituted Al³⁺, and two phases simultaneously coexisted in the ceramics: CaSmAlO₄ and Sm₂O₃. As the doping concentration of Mg²⁺–Ti⁴⁺ ionic pairs increased, the relative permittivity exhibited an upward trend, while the quality factor and resonant frequency temperature coefficient first rose and then descended. Remarkably, 0.09Sm₂O₃–0.91CaSmAl_0.7Mg_0.15–Ti_0.15O₄ sintered at 1450 °C yielded excellent dielectric properties: ε_r = 19.72, Q × f = 72,936 GHz, and τ_f = –0.044 ppm·°C^− 1. The factors influencing the microwave dielectric properties of 0.09Sm₂O₃–0.91CaSmAlO₄ ceramics were further examined by considering the crystal structure, grain size, Lichtenecker logarithmic rule, tolerance factor and packing fraction.

Graphic abstract

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Mg2+-Ti4+ 共掺杂 Sm2O3-CaSmAlO4 微波介电陶瓷中的近零温度系数

CaSmAlO4 微波介电陶瓷的实际应用因其较低的品质因数（Q×f）值和非零温度系数谐振频率（τf）值而受到限制。在这项研究中，我们在 CaSmAlO4 中引入了 Mg2+-Ti4+ 离子对以及过量的 9% Sm2O3。Mg2+-Ti4+ 离子对取代了 Al3+，陶瓷中同时存在两种相：CaSmAlO4和Sm2O3。随着 Mg2+-Ti4+ 离子对掺杂浓度的增加，相对介电常数呈上升趋势，而品质因数和谐振频率温度系数先上升后下降。值得注意的是，0.09Sm2O3-0.91CaSmAl0.7Mg0.15-Ti0.15O4在1450 °C烧结时获得了优异的介电性能：εr = 19.72，Q × f = 72,936 GHz，τf = -0.044 ppm-°C-1。通过考虑晶体结构、晶粒尺寸、Lichtenecker 对数规则、公差系数和堆积分数，进一步研究了影响 0.09Sm2O3-0.91CaSmAlO4 陶瓷微波介电性能的因素。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.