Abstract
A face-centered cubic (fcc) phase with quadrupled cell dimension of the rock salt-type ZrN has been found in the ZrO 2ZrN system by the powder X-ray diffraction method and electron microscopy. The fcc phase coexists with Zr 7O 11N 2, ZrN, and ZrO 2 in the ZrO 2ZrN system with ZrN fraction ranging from 30 to 90 mole%. The cell dimension of the fcc phase has been refined to a = 18.334(2) Å in the 70 mole% ZrO 2-30 mole% ZrN compound and a = 18.329(3) Å in the 30 mole% ZrO 2-70 mole% ZrN compound. The fcc phase is supposed to be chemically denoted as ZrN(O), substituting a small amount of nitrogen atoms with oxygen atoms in the ZrN host lattice in an ordered form.
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