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题名: Unusual calcination temperature dependent tetragonal-monoclinic transitions in rare earth-doped zirconia nanocrystals
作者: Xu, G;  Zhang, YW;  Han, B;  Li, MJ;  Li, C;  Yan, CH
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2003-09-15
DOI: 10.1039/b304966c
卷: 5, 期:18, 页:4008-4014
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The dependence of tetragonal-monoclinic (t --> m) transitions in the hydrothermally prepared (ZrO2)(0.98)(RE2O3)(0.02) (RE = Sc, Y) nanocrystals upon the calcination between 400-1400degreesC were explored by means of X-ray diffraction (XRD), high temperature X-ray diffraction (HTXRD), near infrared Fourier transform (FT) Raman and ultraviolet (UV) Raman spectroscopies. XRD and FT Raman scattering analysis indicated that the monoclinic fraction varied discontinuously with increasing the temperature from 400 to 1400degreesC, which is unusual and is mainly ascribed to the microstrain effect. HTXRD analyses (from room temperature to 1400degreesC) revealed that the as-prepared samples underwent tetragonal --> monoclinic (t --> m) transformation at 500degreesC for (ZrO2)(0.98)(Sc2O3)(0.02) and at 200degreesC for (ZrO2)(0.98)(Y2O3)(0.02) during the cooling process. UV Raman spectra suggested that the t --> m transformation initially occurred at the surface region of the calcined samples. Hence, the monoclinic phase was enriched on the surface of the zirconia grains. Finally, the size effect of the stabilizers (Y3+ and Sc3+) on the critical crystallite size and the metastability of the tetragonal phase were also discussed.
关键词[WOS]: X-RAY-DIFFRACTION ;  PHASE-TRANSFORMATION ;  STABILIZED ZIRCONIA ;  RAMAN-SPECTROSCOPY ;  CRYSTALLITE SIZE ;  THERMAL EVOLUTION ;  PERCENT Y2O3 ;  ZRO2 ;  SPECTRA ;  CERAMICS
语种: 英语
WOS记录号: WOS:000185740700029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138400
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Peking Univ, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China
2.Peking Univ, PKU HKU Joint Lab Rare Earth Mat & Bioinorgan Che, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Xu, G,Zhang, YW,Han, B,et al. Unusual calcination temperature dependent tetragonal-monoclinic transitions in rare earth-doped zirconia nanocrystals[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2003,5(18):4008-4014.
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