Orderedisorder transition and thermal conductivities of the(NdSmEuGd)_((1-x)/2)Dy_(2x)Zr_(2)O_(7)series  

作　　者：Mengyao Li Chucheng Lin Yaran Niu Jimei Zhang Yi Zeng Xuemei Song 

机构地区：[1]The State Key Lab of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,200050,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,100049,China [3]Key Laboratory of Inorganic Coating Materials CAS,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,200050,China

出　　处：《Journal of Materiomics》2023年第1期138-147,共10页无机材料学学报（英文）

基　　金：This work is supported by the National Key Technologies Research and Development Program of China(No.2018YFB0704400);Shanghai Technical Platform for Testing on Inorganic Materials(No.19DZ2290700).

摘　　要：Rare-earth zirconates with pyrochlore and fluorite structures have recently been identified as promising thermal barrier coating materials owing to their low thermal conductivities.In this study,six samples with the general formula(NdSmEuGd)_((1-x)/2)Dy_(2x)Zr_(2)O_(7)were synthesized to further reduce the thermal conductivity.X-ray diffraction and Raman spectroscopy showed that the transition from an ordered pyrochlore to a disordered fluorite structure is due to cation and anion disorder.Transmission electron microscopy showed that anion disorder occurred before cation disorder.A modified mass disorder parameter was introduced into this system,which can describe the change in thermal conductivity well.This parameter can be a basis for designing more complex materials with lower thermal conductivities.

关 键 词：Orderedisorder transition Thermal conductivity High entropy Rare-earth zirconates 

分 类 号：TQ174.1[化学工程—陶瓷工业]