Ferroelastic tetragonal-monoclinic phase transition and anisotropic thermal expansion of LuNbO4 ceramics

Baihui Li, Lin Chen*, Mingyu Hu, Keren Luo, Jiang Tian, Jing Feng*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

3 Citations (Scopus)


Rare-earth tantalates (RETaO4) and niobates (RENbO4) are widely studied as promising thermal barrier coatings based on the ferroelastic tetragonal-monoclinic (t-m) phase transition. We studied the t-m transition process, anisotropic thermal expansion coefficients (TECs), and the corresponding spontaneous strain of LuNbO4 by powder high-temperature X-ray diffraction. The results proved that the unit cell volume and TECs continuously increased with increasing temperature, and the dominant mechanisms of thermal expansion were proposed. Two different orientation states (S1 and S2) caused by the t-m transition led to formation of the ferroelastic domains, and the corresponding spontaneous strain was determined. The relationship between the t-m transition and spontaneous strain was proposed for further property tailoring. This work provided an in-depth analysis of the ferroelastic t-m phase transition, and it would advance the applications of ferroelastic ceramics.

Original languageEnglish
Article number115258
JournalScripta Materialia
Early online date28 Jan 2023
Publication statusPublished - 15 Apr 2023

Scopus Subject Areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

User-Defined Keywords

  • Anisotropic thermal expansion
  • Chemical bonds
  • Ferroelastic phase transition
  • High-temperature XRD
  • Spontaneous strain


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