Phases and phase transformations in nanocrystalline ZrO2

Phases and phase transformations in nanocrystalline ZrO2
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纳米晶 ZrO2 的相和相变

DOI:
10.1007/s11051-006-9116-3
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发表时间:
2006
影响因子:
2.5
通讯作者:
D. V. Szabó
D. V. Szabó
中科院分区:
材料科学4区
文献类型:
--
作者:
D. Vollath;F. D. Fischer;M. Hagelstein;D. V. Szabó

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本文从氦比重瓶、电子衍射、扩展X射线吸收精细结构谱和微扰角相关谱的结果出发,描述了氧化锆的相变和结构。从这些结果与其他氧化物纳米颗粒上得到的结果的比较,可以得出结论,纳米颗粒的相和结构是不同的相比,那些粗晶粒材料。利用裸纳米颗粒和包覆纳米颗粒相变温度的差异,估算了纳米颗粒氧化锆四斜晶系→单斜晶系相变的焓和熵。  通过与从其他纳米晶氧化物获得的结果进行比较,得出以下规则:提供的颗粒是足够小的,由显示相变的材料制成的颗粒在高温结构中结晶。然而,与相同结构的粗颗粒材料相比,纳米颗粒的密度降低。第一次估计将这种现象限制在远低于10 nm的颗粒尺寸。这些纳米粒子遵循Tammann假设的广义相图。
Starting from results from He-pycnometry, electron diffraction, Extended X-ray Absorption Fine Structure Spectroscopy and Perturbed Angular Correlation Spectroscopy the phase transformations and structures of zirconia are described. From a comparison of these results with those obtained on other oxide nanoparticles it is concluded that the phases and structure of nanoparticles are different compared to those of coarse-grained material. The difference of the transformation temperature of bare and coated nanoparticles was used to estimate enthalpy and entropy of the tetragonal → monoclinic transformation for nanoparticulate zirconia. By comparison with results obtained from other nanocrystalline oxides, the following rules were derived: Provided the particles are sufficiently small, particles made of materials showing phase transitions crystallize in the high temperature structure. However, compared to coarse-grained materials of the same structure, the density of nanoparticles is reduced. A first estimation limits this phenomenon to particle sizes well below 10 nm. Those nanoparticles follow the generalized phase diagram postulated by Tammann.
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