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Superfluous oxygen diffusion induced amorphization of ZrC0.6O0.4 and transformation of amorphous layer under electron beam irradiation

Published online by Cambridge University Press:  06 January 2016

Xiaopu Li
Affiliation:
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
Wentao Hu*
Affiliation:
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
*
a) Address all correspondence to this author. e-mail: hwt@ysu.edu.cn
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Abstract

On the powder surface of oxygen-ordered ZrC0.6O0.4 obtained via isothermal heating of vacancy-ordered ZrC0.6 at 300 °C, an amorphous ZrC0.6O y>0.4 layer in nanoscaled thickness is found to form if the heating lasts long enough. With the help of high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) measurements, the amorphous formation is recognized to originate from diffusion of superfluous oxygen atoms into Zr-tetrahedral centers in the surface area, thus leading to severe distortion of the lattice. In situ investigation of HRTEM, SAED, and electron energy loss spectra demonstrates that under electron irradiation of sufficient dose, the amorphous ZrC0.6O y>0.4 layer transforms into a cubic ZrO2−x layer with the same orientation as the underlying ordered ZrC0.6O0.4.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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