Thermophysical Properties of Rare-Earth-Stabilized Zirconia and Zirconate Pyrochlores as Surrogates for Actinide-Doped Zirconia

Autor:	Keiichi Shimamura, Kazuya Idemitsu, Tatsumi Arima, Yaohiro Inagaki
Rok vydání:	2007
Předmět:	Lanthanide Ionic radius Materials science Binding energy Pyrochlore engineering.material Condensed Matter Physics Zirconate symbols.namesake symbols engineering Physical chemistry Cubic zirconia Raman spectroscopy Debye model
Zdroj:	International Journal of Thermophysics. 28:1074-1084
ISSN:	1572-9567 0195-928X
DOI:	10.1007/s10765-007-0232-9
Popis:	Thermophysical properties of rare-earth-stabilized zirconia and zirconate pyrochlores, A2Zr2O7 (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 La2Zr2O7, Nd2Zr2O7, Sm2Zr2O7, and Gd2Zr2O7 had the pyrochlore structure, whereas Dy2Zr2O7 and Y2Zr2O7 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d2e068872510de92b7e68440ee7dae86 https://doi.org/10.1007/s10765-007-0232-9 Zobrazit plný text záznamu Full text from SpringerLink