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

研究成果: ジャーナルへの寄稿記事

21 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)2937-2940
ページ数4
ジャーナルMaterials Letters
65
発行部数19-20
DOI
出版物ステータス出版済み - 10 1 2011

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Fluorspar
composite structures
fluorite
Composite structures
Oxides
Thermodynamic properties
thermodynamic properties
oxides
Thermal conductivity
thermal conductivity
Phonon scattering
Thermal barrier coatings
Phase boundaries
Solid state reactions
Rare earths
Lattice constants
lattice parameters
Volume fraction
rare earth elements
Porosity

All Science Journal Classification (ASJC) codes

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

これを引用

Formation and thermal properties of fluorite-pyrochlore composite structure in La2(ZrxCe1 - X)2O7 oxide system. / Kwak, Kil Ho; Shim, Byung Chul; Lee, Sung Min; Oh, Yoon Suk; Kim, Hyung Tae; Jang, Byung Koog; Kim, Seongwon.

:: Materials Letters, 巻 65, 番号 19-20, 01.10.2011, p. 2937-2940.

研究成果: ジャーナルへの寄稿記事

Kwak, Kil Ho ; Shim, Byung Chul ; Lee, Sung Min ; Oh, Yoon Suk ; Kim, Hyung Tae ; Jang, Byung Koog ; Kim, Seongwon. / Formation and thermal properties of fluorite-pyrochlore composite structure in La2(ZrxCe1 - X)2O7 oxide system. :: Materials Letters. 2011 ; 巻 65, 番号 19-20. pp. 2937-2940.
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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.",
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AU - Kwak, Kil Ho

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AU - Oh, Yoon Suk

AU - Kim, Hyung Tae

AU - Jang, Byung Koog

AU - Kim, Seongwon

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AB - 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.

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