Hagelstein M, Moser H O, Vollath D, Ferrero C, Borowski M
Forschungszentrum Karlsruhe, Germany.
J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):522-4. doi: 10.1107/s090904950001668x.
In order to complement the structural characterisation by high resolution electron microscopy and perturbed angular correlation spectroscopy (PAC) of Al2O3 coated nano-composite ZrO2, XAFS spectra have been acquired and analysed. The electron micrographs showed fringes of a well ordered lattice and well defined crystal faces of the as-produced powder whereas the PAC spectra indicated a strongly distorted short range order. On the basis of the XAFS data, a structural model for the ZrO2 core of the nano-composite ZrO2/Al2O3 with a well ordered Zr lattice and a sevenfold, strongly distorted nearest neighbour oxygen shell is proposed. A smooth temperature dependence without an indication for a phase transformation up to a temperature of 700K has been revealed.
为了补充通过高分辨率电子显微镜和Al2O3涂层纳米复合ZrO2的扰动角关联光谱（PAC）进行的结构表征，已采集并分析了XAFS光谱。电子显微镜图像显示了所制备粉末的有序晶格条纹和清晰定义的晶面，而PAC光谱表明短程有序严重扭曲。基于XAFS数据，提出了一种纳米复合ZrO2/Al2O3的ZrO2核的结构模型，该模型具有有序的Zr晶格和七重严重扭曲的最近邻氧壳层。已揭示出在高达700K的温度下没有相变迹象的平滑温度依赖性。
