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	Thermal expansion and defect chemistry of MgO-doped Sm/sub 2/Zr/sub 2/O/sub 7/
	Zhixue Qu ; Wan, C. ; Wei Pan
	2010-05-10 ; 2010-05-10
关键词	Experimental/ crystal defects interstitials lattice constants magnesium compounds Raman spectroscopy samarium compounds solid solutions thermal expansion X-ray diffraction X-ray photoelectron spectra/ thermal expansion coefficient defect chemistry solid solutions pyrochlore structure solid-state reaction X-ray diffraction high-temperature dilatometry Raman spectroscopy X-ray photoelectron spectroscopy solid-solution mechanism lattice parameters interstitial Sm/sub 2/Zr/sub 2/O/sub 7/:MgO/ A6570 Thermal expansion and thermomechanical effects A6170B Interstitials and vacancies A6110 X-ray determination of structures A8280P Electron spectroscopy for chemical analysis (photoelectron, Auger spectroscopy, etc.) A6160 Crystal structure of specific inorganic compounds/ Sm2Zr2O7:MgO/ss Sm2Zr2O7/ss Sm2/ss Zr2/ss MgO/ss O7/ss Mg/ss Sm/ss Zr/ss O/ss MgO/bin Mg/bin O/bin MgO/dop Mg/dop O/dop
中文摘要	A series of solid solutions of (Sm/sub 2-*/Mg/sub x/)Zr/sub 2/O/sub 7-*/2/ pyrochlores were prepared by a solid-state reaction and characterized by X-ray diffraction, high-temperature dilatometry, Raman spectroscopy, and X-ray photoelectron spectroscopy. X-ray diffraction and Raman spectroscopy reveal that MgO doping does not break down the pyrochlore structure of Sm/sub 2/Zr/sub 2/O/sub 7/ for all of the samples, though it increases the degree of structure disorder. However, the thermal expansion coefficient is remarkably increased through doping up to x = 0.075 with a maximum value around 11.94 * 10/sup -6/ K/sup -1/ (room temperature to 1000 degrees C), which can mitigate the mismatches of thermal expansion in the high-temperature applications of Sm/sub 2/Zr/sub 2/O/sub 7/. A new solid - solution mechanism that is different from previous research was proposed and confirmed by analyzing the variation of the lattice parameters, experimental density, and X-ray photoelectron spectroscopy of samples. It involves the transformation of the solid - solution model about Mg/sup 2+/ interstitial and substitution with a turning point at composition point x = 0.075. This transformation and consequently the variation of lattice energy may be responsible for the variation of the thermal expansion coefficient.
语种	英语 ; 英语
出版者	American Chemical Society ; USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/20659]
专题	清华大学
推荐引用方式 GB/T 7714	Zhixue Qu,Wan, C.,Wei Pan. Thermal expansion and defect chemistry of MgO-doped Sm/sub 2/Zr/sub 2/O/sub 7/[J],2010, 2010.
APA	Zhixue Qu,Wan, C.,&Wei Pan.(2010).Thermal expansion and defect chemistry of MgO-doped Sm/sub 2/Zr/sub 2/O/sub 7/..
MLA	Zhixue Qu,et al."Thermal expansion and defect chemistry of MgO-doped Sm/sub 2/Zr/sub 2/O/sub 7/".(2010).

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