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题名: Structure characterization and monolayer dispersion phenomenon of MgO-ZrO2 prepared by co-precipitation
作者: Guan, HB;  Liang, J;  Zhu, YX;  Zhao, BY;  Xie, YC
关键词: ZrO2 ;  MgO ;  binary oxide ;  monolayer dispersion ;  co-precipitation ;  solid solution
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2005-09-01
DOI: 10.3866/PKU.WHXB20050914
卷: 21, 期:9, 页:1011-1016
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: A series of MgO-ZrO2 composites with various compositions were prepared by co-precipitation with NH4OH from mixed aqueous solution of nitrates and calcination at 500 degrees C and 600 degrees C respectively. The samples were characterized by XRD, XPS, BET, TEM, EXAFS and DTA measurements. The results exhibit that MgO tends to dissolve into the bulk phase of ZrO2 to form solid solution as Mg/Zr molar ratio is lower than 1. After the dissolution reaches saturation, MgO starts to disperse onto the surface of the solid solution, and at the same time the separate crystalline phase of MgO appears. However, when the content of MgO is high, ZrO2 does not dissolve into the bulk phase of MgO and not form the separate crystalline phase of ZrO2, but disperses onto the surface of the crystallite of MgO. And the properties of the surfaces of the samples were obviously affected by the dispersion of ZrO2. These results suggest that in the samples prepared by co-pre-cipitation, one component can disperse as a monolayer onto the surface of the separate crystalline phase of the other component or the solid solutions composed of the two components. in a certain content range. This phe-nomenon might exist in many binary oxide systems and deserves much more attention.
关键词[WOS]: SURFACE ;  OXIDE ;  PHASES ;  EXAFS ;  MGO
语种: 英语
WOS记录号: WOS:000231990900014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139877
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, Coll Chem & Mol Engn, Inst Chem Phys, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100871, Peoples R China

Recommended Citation:
Guan, HB,Liang, J,Zhu, YX,et al. Structure characterization and monolayer dispersion phenomenon of MgO-ZrO2 prepared by co-precipitation[J]. ACTA PHYSICO-CHIMICA SINICA,2005,21(9):1011-1016.
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