Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores as surrogates for actinide-doped zirconia

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Abstract

Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores, A 2Zr 2O 7 (A = La, Nd, Sm, Gd, Dy, Y), were evaluated by X-ray diffractometry, Raman spectroscopy, and the ultrasound pulse-echo method. Crystallographic analyses elucidated that La 2Zr 2O 7, Nd 2Zr 2O 7, Sm 2Zr 2O 7, and Gd 2Zr 2O 7 had the pyrochlore structure, whereas Dy 2Zr 2O 7 and Y 2Zr 2O 7 had the defect fluorite structure. For lanthanide pyrochlores, the thermal expansion became smaller with increasing ionic radius of A and increasing crystal binding energy. The elastic moduli and Debye temperature evaluated using longitudinal and transverse sound velocities also depend on the ionic radius and binding energy, and hence these values related to mechanical properties increase with the ionic radius of A. On the other hand, Poisson's ratio was almost comparable among these pyrochlores. In addition, thermophysical properties of actinide pyrochlore are discussed in this study.

Original languageEnglish
Pages (from-to)1074-1084
Number of pages11
JournalInternational Journal of Thermophysics
Volume28
Issue number3
DOIs
Publication statusPublished - Jun 1 2007

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thermophysical properties
zirconium oxides
rare earth elements
radii
binding energy
fluorite
Poisson ratio
acoustic velocity
thermal expansion
modulus of elasticity
echoes
Raman spectroscopy
specific heat
mechanical properties
defects
pulses
crystals
x rays
temperature
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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title = "Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores as surrogates for actinide-doped zirconia",
abstract = "Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores, A 2Zr 2O 7 (A = La, Nd, Sm, Gd, Dy, Y), were evaluated by X-ray diffractometry, Raman spectroscopy, and the ultrasound pulse-echo method. Crystallographic analyses elucidated that La 2Zr 2O 7, Nd 2Zr 2O 7, Sm 2Zr 2O 7, and Gd 2Zr 2O 7 had the pyrochlore structure, whereas Dy 2Zr 2O 7 and Y 2Zr 2O 7 had the defect fluorite structure. For lanthanide pyrochlores, the thermal expansion became smaller with increasing ionic radius of A and increasing crystal binding energy. The elastic moduli and Debye temperature evaluated using longitudinal and transverse sound velocities also depend on the ionic radius and binding energy, and hence these values related to mechanical properties increase with the ionic radius of A. On the other hand, Poisson's ratio was almost comparable among these pyrochlores. In addition, thermophysical properties of actinide pyrochlore are discussed in this study.",
author = "Keiichi Shimamura and Tatsumi Arima and Kazuya Idemitsu and Yaohiro Inagaki",
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TY - JOUR

T1 - Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores as surrogates for actinide-doped zirconia

AU - Shimamura, Keiichi

AU - Arima, Tatsumi

AU - Idemitsu, Kazuya

AU - Inagaki, Yaohiro

PY - 2007/6/1

Y1 - 2007/6/1

N2 - Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores, A 2Zr 2O 7 (A = La, Nd, Sm, Gd, Dy, Y), were evaluated by X-ray diffractometry, Raman spectroscopy, and the ultrasound pulse-echo method. Crystallographic analyses elucidated that La 2Zr 2O 7, Nd 2Zr 2O 7, Sm 2Zr 2O 7, and Gd 2Zr 2O 7 had the pyrochlore structure, whereas Dy 2Zr 2O 7 and Y 2Zr 2O 7 had the defect fluorite structure. For lanthanide pyrochlores, the thermal expansion became smaller with increasing ionic radius of A and increasing crystal binding energy. The elastic moduli and Debye temperature evaluated using longitudinal and transverse sound velocities also depend on the ionic radius and binding energy, and hence these values related to mechanical properties increase with the ionic radius of A. On the other hand, Poisson's ratio was almost comparable among these pyrochlores. In addition, thermophysical properties of actinide pyrochlore are discussed in this study.

AB - Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores, A 2Zr 2O 7 (A = La, Nd, Sm, Gd, Dy, Y), were evaluated by X-ray diffractometry, Raman spectroscopy, and the ultrasound pulse-echo method. Crystallographic analyses elucidated that La 2Zr 2O 7, Nd 2Zr 2O 7, Sm 2Zr 2O 7, and Gd 2Zr 2O 7 had the pyrochlore structure, whereas Dy 2Zr 2O 7 and Y 2Zr 2O 7 had the defect fluorite structure. For lanthanide pyrochlores, the thermal expansion became smaller with increasing ionic radius of A and increasing crystal binding energy. The elastic moduli and Debye temperature evaluated using longitudinal and transverse sound velocities also depend on the ionic radius and binding energy, and hence these values related to mechanical properties increase with the ionic radius of A. On the other hand, Poisson's ratio was almost comparable among these pyrochlores. In addition, thermophysical properties of actinide pyrochlore are discussed in this study.

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