Ordered Arrangement of Oxygen in the Interstitial Solid Solution of Zirconium-Oxygen System
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The crystal structure of interstitial solid solution of zirconium-oxygen system was investigated by means of X-ray, electron and neutron diffraction on specimens in the composition range between 11 and 27 at% O. The specimens were prepared by melting appropriate mixtures of zirconium metal and zirconium dioxide in an arc-furnace. In addition to a superstructure found by Holmberg and Dagerhamn in the composition ZrO_y (0.33<y<0.40), a new supersturcture having a different ordered arrangement of oxygen was found in the range of ZrO_x (0.25<x<0.33). The atomic arrangement of oxygen in these superstructrues can be expressed in terms of the stacking sequence of octahedral interstitial sites in the lattice of α-Zr, i.e., ABCABC... and ABAB... stackings in ZrO_x and ZrO_y respectively. However, the limiting composition ZrO_<0.333> has an intermediate structure in which the arrangement of oxygen atoms is basically described as ABCBCACAB... stacking with nine layers period. The actual distribution of oxygen in specimens is not ideally regular as mentioned above, but contains rather high degree of stacking disorder.
- 東北大学の論文
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