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Thermal conductivity of ceramics in the ZrO2-GdO1.5system

Published online by Cambridge University Press:  31 January 2011

Jie Wu ,
Nitin P. Padture ,
Paul G. Klemens ,
Maurice Gell ,
Eugenio García ,
Pilar Miranzo  and
Maria I. Osendi
Jie Wu
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136
Nitin P. Padture*
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136
Paul G. Klemens
Affiliation:
Department of Physics, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136
Maurice Gell
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136
Eugenio García
Affiliation:
Instituto de Cerámica y Vidrio, CSIC, Cantoblanco, 28049 Madrid, Spain
Pilar Miranzo
Affiliation:
Instituto de Cerámica y Vidrio, CSIC, Cantoblanco, 28049 Madrid, Spain
Maria I. Osendi
Affiliation:
Instituto de Cerámica y Vidrio, CSIC, Cantoblanco, 28049 Madrid, Spain
*
a)Address all correspondence to this author.niitin.padture@uconn.edu
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Abstract

Low thermal conductivity ceramics in the ZrO2–GdO1.5 system have potential in structural (refractories, thermal barrier coatings, thermal protection) and nuclear applications. To that end, the thermal conductivities of hot-pressed xGdO1.5 ·(1 – x)ZrO2 (where x = 0.05, 0.15, 0.31, 0.50, 0.62, 0.75, 0.89, and 1.00) solid solutions were measured, for the first time, as a function of temperature in the range 25 to 700 °C. On the ZrO2-rich side, the thermal conductivity first decreased rapidly with increasing concentration of GdO1.5 and then reached a plateau. On the GdO1.5-rich side, the decrease in the thermal conductivity with increasing concentration of ZrO2 was less pronounced. The thermal conductivity was less sensitive to the composition with increasing temperature. The thermal conductivity of pyrochlore Gd2Zr2O7 (x = 0.5) was higher than that of surrounding compositions at all temperatures. A semiempirical phonon-scattering theory was used to analyze the experimental thermal conductivity data. In the case of pure ZrO2 and GdO1.5, the dependence of the thermal conductivity to the absolute temperature (T) was less than 1/T. Therefore, the minimum thermal conductivity theory was applied, which better described the temperature dependence of the thermal conductivity of pure ZrO2 and GdO1.5. In the case of solid solutions, phonon scattering by cation mass fluctuations and additional scattering by oxygen vacancies on the ZrO2-rich side and by gadolinium vacancies on the GdO1.5-side seemed to account for the composition and temperature dependence of the thermal conductivity.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3193 - 3200
Copyright
Copyright © Materials Research Society 2002

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