TY - JOUR
T1 - Rattler effect on the properties of multicomponent rare-earth-zirconate ceramics
AU - Yang, Runwu
AU - Xu, Jie
AU - Wei, Mingyue
AU - Zhu, Jiatong
AU - Meng, Xuanyu
AU - Zhang, Ping
AU - Yang, Jinlong
AU - Gao, Feng
N1 - Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.
PY - 2022/10/1
Y1 - 2022/10/1
N2 - Rattler effect caused by size disorder in the cation sublattice of rare-earth zirconates has been proved to be an effective way for the thermal conductivity reduction. Herein, a series of multicomponent ((La1/3Eu1/3Gd1/3)1-xYbx)2Zr2O7 (x = 0, 0.25, 0.5, 0.75 and 1) ceramics were synthesized, their structures and the influence of rattler effect on thermal conductivity were investigated. The increasing Yb3+ doping content causes the phase transformation from pyrochlore structure to fluorite structure. The dual-phase ((La1/3Eu1/3Gd1/3)0.75Yb0.25)2Zr2O7 exhibits enhanced hardness owing to the small grain size of the dual-phase structure, which can effectively alleviate the stress to hinder deformation. Also, it has a higher coefficient of thermal expansion of 11.2 × 10−6/K (1200 °C). Since Yb3+ acts as active resonant scattering center, lower thermal conductivity of ((La1/3Eu1/3Gd1/3)0.75Yb0.25)2Zr2O7 and ((La1/3Eu1/3Gd1/3)0.5Yb0.5)2Zr2O7 caused by rattler effect makes them promising thermal barrier coatings.
AB - Rattler effect caused by size disorder in the cation sublattice of rare-earth zirconates has been proved to be an effective way for the thermal conductivity reduction. Herein, a series of multicomponent ((La1/3Eu1/3Gd1/3)1-xYbx)2Zr2O7 (x = 0, 0.25, 0.5, 0.75 and 1) ceramics were synthesized, their structures and the influence of rattler effect on thermal conductivity were investigated. The increasing Yb3+ doping content causes the phase transformation from pyrochlore structure to fluorite structure. The dual-phase ((La1/3Eu1/3Gd1/3)0.75Yb0.25)2Zr2O7 exhibits enhanced hardness owing to the small grain size of the dual-phase structure, which can effectively alleviate the stress to hinder deformation. Also, it has a higher coefficient of thermal expansion of 11.2 × 10−6/K (1200 °C). Since Yb3+ acts as active resonant scattering center, lower thermal conductivity of ((La1/3Eu1/3Gd1/3)0.75Yb0.25)2Zr2O7 and ((La1/3Eu1/3Gd1/3)0.5Yb0.5)2Zr2O7 caused by rattler effect makes them promising thermal barrier coatings.
KW - Mechanical properties
KW - Multicomponent compounds
KW - Rare-earth zirconates
KW - Rattler effect
KW - Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=85132934667&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2022.06.172
DO - 10.1016/j.ceramint.2022.06.172
M3 - 文章
AN - SCOPUS:85132934667
SN - 0272-8842
VL - 48
SP - 28586
EP - 28594
JO - Ceramics International
JF - Ceramics International
IS - 19
ER -