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Ordered arrangements of oxygen atoms dissolved in α-zirconium near the stoichiometric composition ZrO1/3 have been investigated by means of electron diffraction and dark-field electron microscopy. The arrangements of oxygen atoms are specified as the long period stacking sequences of the interstitial layers of octahedral sites normal to the c axis of the h.c.p. lattice. Eight kinds of the stacking variants of the oxygen layers are found in the composition range from 24 to 26 at.% O in the order of 8H (7\overline 1), 5H (4\overline 1), 12R (3\overline 1)3, 7H (3\overline 12\overline 1), 10H (1\overline 31\overline 13\overline 1), 9R (2\overline 1)3, 12H (1\overline 31\overline 11\overline 13\overline 1) and 14H (1\overline 13\overline 11\overline 11\overline 31\overline 1) or (1\overline 31\overline 11\overline 11\overline 13\overline 1). These stackings become irregular by quenching from about 600°C.

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