Wenjing Qiao, Jiantuo Zhao, Yingwei Qi, Xiaopei Zhu, Xifei Wang, Zhizhi Xu, Mei Bai, Junwen Mei, Yanhua Hu and Xiaojie Lou
{"title":"Ultra-low thermal conductivity and enhanced mechanical properties of high-entropy perovskite ceramics†","authors":"Wenjing Qiao, Jiantuo Zhao, Yingwei Qi, Xiaopei Zhu, Xifei Wang, Zhizhi Xu, Mei Bai, Junwen Mei, Yanhua Hu and Xiaojie Lou","doi":"10.1039/D4TC03278K","DOIUrl":null,"url":null,"abstract":"<p >At present, the research on high-entropy perovskite materials mainly focuses on electrical properties. When they are employed in high-temperature and high-pressure environments, the stability of their working performance is extremely important, but the research on them is very limited. A novel entropy-stabilized ceramic system, denoted as Ba(Zr<small><sub>0.2</sub></small>Ti<small><sub>0.2</sub></small>Sn<small><sub>0.2</sub></small>Hf<small><sub>0.2</sub></small>X<small><sub>0.2</sub></small>)O<small><sub>3</sub></small> (X = Nb<small><sup>5+</sup></small>, Ta<small><sup>5+</sup></small>), featuring a disordered perovskite structure, was synthesized. The high entropy ceramic, Ba(Zr<small><sub>0.2</sub></small>Ti<small><sub>0.2</sub></small>Sn<small><sub>0.2</sub></small>Hf<small><sub>0.2</sub></small>Ta<small><sub>0.2</sub></small>)O<small><sub>3</sub></small> (abbreviated as HEC-Ta), manifests a thermal expansion coefficient (9.00 × 10<small><sup>−6</sup></small> K<small><sup>−1</sup></small> at 1400 °C). It exhibits exceptional thermal stability within the range of 30 to 1400 °C, coupled with low thermal conductivity (1.97 W m<small><sup>−1</sup></small> K<small><sup>−1</sup></small> at 1200 °C) and superior mechanical properties (<em>H</em><small><sub>v</sub></small> = 10.96 GPa, <em>E</em> = 178.28 GPa). These properties are ascribed to a high degree of lattice distortion arising from the stochastic distribution of different cations, along with the high entropy cocktail effect, leading to increased phonon scattering. This study thus presents a novel approach to develop a ceramic material devoid of rare earth elements, and can be enlightened for the application of perovskite materials in high temperature environments.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 43","pages":" 17687-17694"},"PeriodicalIF":5.7000,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Chemistry C","FirstCategoryId":"1","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/tc/d4tc03278k","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
At present, the research on high-entropy perovskite materials mainly focuses on electrical properties. When they are employed in high-temperature and high-pressure environments, the stability of their working performance is extremely important, but the research on them is very limited. A novel entropy-stabilized ceramic system, denoted as Ba(Zr0.2Ti0.2Sn0.2Hf0.2X0.2)O3 (X = Nb5+, Ta5+), featuring a disordered perovskite structure, was synthesized. The high entropy ceramic, Ba(Zr0.2Ti0.2Sn0.2Hf0.2Ta0.2)O3 (abbreviated as HEC-Ta), manifests a thermal expansion coefficient (9.00 × 10−6 K−1 at 1400 °C). It exhibits exceptional thermal stability within the range of 30 to 1400 °C, coupled with low thermal conductivity (1.97 W m−1 K−1 at 1200 °C) and superior mechanical properties (Hv = 10.96 GPa, E = 178.28 GPa). These properties are ascribed to a high degree of lattice distortion arising from the stochastic distribution of different cations, along with the high entropy cocktail effect, leading to increased phonon scattering. This study thus presents a novel approach to develop a ceramic material devoid of rare earth elements, and can be enlightened for the application of perovskite materials in high temperature environments.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors