High-entropy effects enhance atomic displacements to manipulate thermal/oxygen ionic transport properties of ordered RE3MO7 ceramics

IF 12.1 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2025-10-09 DOI:10.1007/s12598-025-03625-z

Guiyu Xue, Jiankun Wang, Chenyu Li, Cheng Xu, Chao Li, Lin Chen, Jing Feng

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引用次数: 0

Abstract

The high-entropy engineering has emerged as a novel method for manipulating various properties of ceramics. Herein, the enhancement of atomic displacements was shown to effectively tailor the thermal/oxygen ionic conductivities of high-entropy ceramics (HECs). Although RE3MO7 (RE represents rare-earth elements; M is Ta or Nb) ceramics have been widely studied for use in thermal barrier coatings and solid oxide fuel cells, their application scope can be broadened through the effective manipulation of the thermal/oxygen ionic conductivities. Herein, (Sm1/5Eu1/5Gd1/5Dy1/5Ho1/5)3Ta1/2Nb1/2O7 HECs are designed and synthesized. These ceramics exhibit lower thermal conductivity and higher oxygen ionic conductivity than pristine ordered RE3MO7 ceramics. Characterization results prove that high-entropy effects in the prepared material enhance atomic displacement parameters (ADPs), causing an increase in the oxygen ionic conductivity by a factor of 10 and enhancement in the phonon scattering rate, thereby reducing thermal conductivity by increasing ADPs. The ADPs can act as an indicator of the anharmonic vibration strength of the lattice, affecting the thermal/oxygen ionic conductivity and thermal expansion coefficient. Furthermore, in nano-indentation tests, (Sm1/5Eu1/5Gd1/5Dy1/5Ho1/5)3Ta1/2Nb1/2O7 HECs show high hardness (11.8 GPa), toughness (2.0 MPa·m1/2), and modulus (215.0 GPa), which are beneficial for structural/functional applications. Overall, the obtained results indicate that thermal/oxygen ionic transport mechanisms can be used to further improve the properties and thereby expand the application scope of various HECs.

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高熵效应增强了原子位移，控制了有序RE3MO7陶瓷的热/氧离子输运性质

高熵工程是一种控制陶瓷各种性能的新方法。在此，原子位移的增强被证明可以有效地调整高熵陶瓷（HECs）的热/氧离子电导率。虽然RE3MO7 （RE代表稀土元素，M代表Ta或Nb）陶瓷在热障涂层和固体氧化物燃料电池中的应用已经得到了广泛的研究，但通过对热/氧离子电导率的有效控制，可以扩大其应用范围。本文设计并合成了（Sm1/5Eu1/5Gd1/5Dy1/5Ho1/5）3Ta1/2Nb1/2O7 HECs。这些陶瓷比原始有序RE3MO7陶瓷表现出更低的导热性和更高的氧离子电导率。表征结果证明，制备材料中的高熵效应增强了原子位移参数（ADPs），导致氧离子电导率提高10倍，声子散射率增强，从而通过增加ADPs降低热导率。adp可以作为晶格非简谐振动强度的指示器，影响热/氧离子电导率和热膨胀系数。此外，在纳米压痕测试中，（Sm1/5Eu1/5Gd1/5Dy1/5Ho1/5）3Ta1/2Nb1/2O7 HECs具有较高的硬度（11.8 GPa）、韧性（2.0 MPa·m1/2）和模量（215.0 GPa），有利于结构/功能应用。综上所述，研究结果表明，热/氧离子输运机制可以进一步改善各种HECs的性能，从而扩大其应用范围。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.