新型 Ba(Eu1/5Sm1/5Nd1/5Pr1/5La1/5)2Ti4O12 高熵陶瓷的晶体结构和微波介电特性

IF 2.4 4区材料科学 Q2 CRYSTALLOGRAPHY

Crystals Pub Date : 2024-08-25 DOI:10.3390/cryst14090754

Qing Wan, Zeping Li, Huifeng Wang, Gang Xiong, Geng Wang

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引用次数: 0

摘要

通过固态路线合成了高导率 Ba(Eu1/5Sm1/5Nd1/5Pr1/5La1/5)2Ti4O12（BESNPLT）高熵陶瓷（HECs）。对 BESNPLT 高熵陶瓷的微观结构、烧结行为、相结构、振动模式和微波介电特性进行了深入研究。研究证实，BESNPLT HECs 的相结构为 Pnma 空间群的单相正交钨青铜型结构。介电常数（εr）主要受极化率和相对密度的影响。品质因数（Q×f）与堆积分数有显著的相关性，而 BESNPLT HECs 的温度系数（TCF）则与容限因子和 B 位的键价密切相关。BESNPLT HECs 在 1400 °C 下烧结，显示出高相对密度（>97%）和最佳微波介电特性（TCF = +38.9 ppm/°C，Q×f = 8069 GHz (@6.1 GHz)，εr = 87.26）。这项研究表明，高熵策略是改变钨青铜型微波陶瓷介电特性的有效途径。

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Crystal Structure and Microwave Dielectric Characteristics of Novel Ba(Eu1/5Sm1/5Nd1/5Pr1/5La1/5)2Ti4O12 High-Entropy Ceramic

High-permittivity Ba(Eu1/5Sm1/5Nd1/5Pr1/5La1/5)2Ti4O12 (BESNPLT) high-entropy ceramics (HECs) were synthesized via a solid-state route. The microstructure, sintering behavior, phase structure, vibration modes, and microwave dielectric characteristics of the BESNPLT HECs were thoroughly investigated. The phase structure of the BESNPLT HECs was confirmed to be a single-phase orthorhombic tungsten-bronze-type structure of Pnma space group. Permittivity (εr) was primarily influenced by polarizability and relative density. The quality factor (Q×f) exhibited a significant correlation with packing fraction, whereas the temperature coefficient (TCF) of the BESNPLT HECs closely depended on the tolerance factor and bond valence of B-site. The BESNPLT HECs sintered at 1400 °C, demonstrating high relative density (>97%) and optimum microwave dielectric characteristics with TCF = +38.9 ppm/°C, Q×f = 8069 GHz (@6.1 GHz), and εr = 87.26. This study indicates that high-entropy strategy was an efficient route in modifying the dielectric characteristics of tungsten-bronze-type microwave ceramics.

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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.