Formation and thermal properties of fluorite-pyrochlore composite structure in La2(ZrxCe1 - X)2O7 oxide system

Kil Ho Kwak, Byung Chul Shim, Sung Min Lee, Yoon Suk Oh, Hyung Tae Kim, Byung Koog Jang, Seongwon Kim

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Rare-earth oxides of La2(ZrxCe1 - x) 2O7 for thermal barrier coatings (TBCs) are fabricated via a solid-state reaction at 1600 °C. As the phase formation, microstructure, and thermal properties of these oxides are examined, a fluorite-pyrochlore composite structure is found in the La2(ZrxCe 1 - x)2O7 system. This composite structure is composed of coarse Ce-rich fluorite and fine Zr-rich pyrochlore grains. From XRD and microstructural analysis, the lattice parameter and volume fraction of each phase are evaluated in order to obtain the intrinsic thermal conductivity value of composite-structured oxide with porosity calibration. The thermal conductivity of the composite structure is similar to that of pyrochlore La 2Zr2O7, which is attributed to phonon scattering by phase boundaries.

Original languageEnglish
Pages (from-to)2937-2940
Number of pages4
JournalMaterials Letters
Volume65
Issue number19-20
DOIs
Publication statusPublished - Oct 1 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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