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Crystallography of a new metastable phase in Zr-N alloy.

Selected-area and convergent-beam electron diffraction were used to determine the lattice, point and space groups of a new metastable phase (designated the pi phase) in the Zr-N system. The pi phase has a body-centered tetragonal lattice with a approximately 0.66 nm and a c/a ratio of 0.81. The point-group symmetry of the phase is 4/mmm and the space group is I4/mmm.