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Citation: GUAN Hong-bo, LIANG Jian, ZHU Yue-xiang, ZHAO Bi-ying, XIE You-chang. Structure Characterization and Monolayer Dispersion Phenomenon of M -ZrO₂ Prepared by Co-precipitation[J]. Acta Physico-Chimica Sinica, ;2005, 21(09): 1011-1016. doi: 10.3866/PKU.WHXB20050914 shu

Structure Characterization and Monolayer Dispersion Phenomenon of M -ZrO₂ Prepared by Co-precipitation

1.
State Key Laboratory for Structural Chemistry of Unstable & Stable Species, Institute of Physical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871

Received Date: 21 January 2005
Available Online: 15 September 2005

A series of M -ZrO₂ composites with various compositions were prepared by co-precipitation with NH4OH from mixed aqueous solution of nitrates and calcination at 500 ℃ and 600 ℃ respectively. The samples were characterized by XRD, XPS, BET, TEM, EXAFS and DTA measurements. The results exhibit that M 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, M starts to disperse onto the surface of the solid solution, and at the same time the separate crystalline phase of M appears. However, when the content of M is high, ZrO₂ does not dissolve into the bulk phase of M and not form the separate crystalline phase of ZrO₂, but disperses onto the surface of the crystallite of M . 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-precipitation, 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 phenomenon might exist in many binary oxide systems and deserves much more attention.
- ZrO₂;M ;Binary oxide;Monolayer dispersion;Co-precipitation;Solid solution
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Structure Characterization and Monolayer Dispersion Phenomenon of M -ZrO2 Prepared by Co-precipitation

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Structure Characterization and Monolayer Dispersion Phenomenon of M -ZrO₂ Prepared by Co-precipitation