(Sm0.2Eu0.2Tb0.2Dy0.2Lu0.2)2Si2O7: A novel high-entropy rare earth disilicate porous ceramics with high porosity and low thermal conductivity

Debao Liu, Xinlei Jia, Baolu Shi, Yiguang Wang, Baosheng Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Herein, a novel quinary high-entropy rare earth disilicate (Sm0.2Eu0.2Tb0.2Dy0.2Lu0.2)2Si2O7 ((5RE1/5)2Si2O7) porous ceramics were synthesized through a sol-gel/vacuum freeze-drying method with high-temperature calcination process. The microstructure, phase composition, thermal conductivity, compressive strength, and thermal stability of the as-prepared (5RE1/5)2Si2O7 porous ceramics were systematically investigated. The results indicated that the samples possess high porosity of 76.83%, pore size of 0.3–1.2 μm, homogeneous microstructure with small grain size of 400–800 nm, which results in low thermal conductivity of 0.94 W/(m·K) at 1273 K and high compressive strength of 6.55 MPa. These excellent properties indicated that as-prepared (5RE1/5)2Si2O7 porous ceramics has a great potential application value in the field of high-temperature thermal insulation materials.

Original languageEnglish
Article number126181
JournalMaterials Chemistry and Physics
Volume286
DOIs
Publication statusPublished - 1 Jul 2022

Keywords

  • Compressive strength
  • High-entropy rare earth disilicate
  • Porous ceramics
  • Thermal conductivity
  • Thermal stability

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