Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multiscale defects analysis

IF 18.6 1区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Jun Wang, Qianqian Jin, Jianbo Song, Di Zhang, Bin Xu, Zhiyi Ren, Meng Wang, Shixiao Yan, Xiaoliang Sun, Chi Liu, Xiaoyu Chong, Jing Feng
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引用次数: 0

Abstract

Thermal barrier coatings (TBCs) materials can improve energy conversion efficiency and reduce fossil fuel use. Herein, the novel rare earth tantalates RETaO4, as promising candidates for TBCs, were reassembled into multi-component solid solutions with a monoclinic structure to further depress the thermal conductivity via an entropy strategy. The formation mechanisms of oxygen vacancy defects, dislocations and ferroelastic domains associated with thermal conductivity are demonstrated by aberration-corrected scanning transmission electron microscopy. Compared to single-RE RETaO4 and 8YSZ, the intrinsic thermal conductivity of (5RE1/5)TaO4 was decreased by 35% ~ 47% and 57% ~ 69% at 1200°C, respectively, which is likely attributed to the multi-scale phonon scattering from Umklapp phonon–phonon, point defects, domain structures and dislocations.  and low-temperature thermal conductivity are negatively correlated, as are E/κ and high-temperature thermal conductivity. Meanwhile, the high defects' concentration and lattice distortion in high-entropy ceramics enhances the scattering of transverse-wave phonons and reduces the transverse-wave sound velocity, leading to a decrease in the thermal conductivity and Young's modulus. In addition, 5HEC-1 has ultra-low thermal conductivity, moderate thermal expansion coefficients and high hardness among the three five-component high-entropy samples. Thus, 5HEC-1 with superior thermal barrier and mechanical properties can be used as a promising thermal insulating material.
通过多尺度缺陷分析揭示高熵稀土钽酸盐的低导热性
热障涂层材料可以提高能量转换效率,减少化石燃料的使用。本文将新型稀土钽酸盐RETaO4作为tbc的候选者,重新组装成具有单斜结构的多组分固溶体,通过熵策略进一步降低导热系数。利用像差校正扫描透射电子显微镜研究了与热导率相关的氧空位缺陷、位错和铁弹性畴的形成机制。与单re RETaO4和8YSZ相比,(5RE1/5)TaO4在1200℃时的本征导热系数分别下降了35% ~ 47%和57% ~ 69%,这可能是由于Umklapp声子-声子散射、点缺陷、畴结构和位错等因素造成的。与低温导热系数呈负相关,E/κ与高温导热系数呈负相关。同时,高熵陶瓷中的高缺陷浓度和晶格畸变增强了横波声子的散射,降低了横波声速,导致导热系数和杨氏模量下降。此外,在三种五组分高熵样品中,5HEC-1具有超低导热系数、适中的热膨胀系数和较高的硬度。因此,5HEC-1具有优异的热障性能和力学性能,是一种很有前途的保温材料。
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
Journal of Advanced Ceramics
Journal of Advanced Ceramics MATERIALS SCIENCE, CERAMICS-
CiteScore
21.00
自引率
10.70%
发文量
290
审稿时长
14 days
期刊介绍: Journal of Advanced Ceramics is a single-blind peer-reviewed, open access international journal published on behalf of the State Key Laboratory of New Ceramics and Fine Processing (Tsinghua University, China) and the Advanced Ceramics Division of the Chinese Ceramic Society. Journal of Advanced Ceramics provides a forum for publishing original research papers, rapid communications, and commissioned reviews relating to advanced ceramic materials in the forms of particulates, dense or porous bodies, thin/thick films or coatings and laminated, graded and composite structures.
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