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

doi:10.1016/j.matlet.2011.06.043

Formation and thermal properties of fluorite-pyrochlore composite structure in La₂(Zr_xCe_{1 - 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 journal › Article › peer-review

24 Citations (Scopus)

Abstract

Rare-earth oxides of La₂(Zr_xCe_{1 - 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(Zr_xCe _{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 language	English
Pages (from-to)	2937-2940
Number of pages	4
Journal	Materials Letters
Volume	65
Issue number	19-20
DOIs	https://doi.org/10.1016/j.matlet.2011.06.043
Publication status	Published - Oct 2011
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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10.1016/j.matlet.2011.06.043

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

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.",

author = "Kwak, {Kil Ho} and Shim, {Byung Chul} and Lee, {Sung Min} and Oh, {Yoon Suk} and Kim, {Hyung Tae} and Jang, {Byung Koog} and Seongwon Kim",

note = "Funding Information: This study was supported by a grant from “ The Fundamental R&D Program for Core Technology of Materials ” funded by the Ministry of Knowledge Economy, Republic of Korea. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",

year = "2011",

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doi = "10.1016/j.matlet.2011.06.043",

language = "English",

volume = "65",

pages = "2937--2940",

journal = "Materials Letters",

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AU - Kwak, Kil Ho

AU - Shim, Byung Chul

AU - Lee, Sung Min

AU - Oh, Yoon Suk

AU - Kim, Hyung Tae

AU - Jang, Byung Koog

AU - Kim, Seongwon

N1 - Funding Information: This study was supported by a grant from “ The Fundamental R&D Program for Core Technology of Materials ” funded by the Ministry of Knowledge Economy, Republic of Korea. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2011/10

Y1 - 2011/10

N2 - 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.

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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ER -

Formation and thermal properties of fluorite-pyrochlore composite structure in La₂(Zr_xCe_{1 - X})₂O₇ oxide system

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