Abstract
Mn 1− x C x amorphous alloys with x varying from 0.25 to 0.34 were prepared by RF magnetron sputtering. Their crystallization studied by in situ transmission electron microscopy leads at nearly T=650 K to carbides with feather-shaped or lath-shaped morphologies. The SAED patterns show that it is matter of a set of new triangular prismatic sheet (TPS) carbides deriving from Mn 5C 2 with either periodic or one-dimensional aperiodic structures. For the periodic structures, we identify three new carbides: Mn 7C 3, Mn 9C 4 and Mn 2C. Aperiodic TPS structures transform with an increase of the temperature into the concentration-nearest periodic TPS structures. All these structures are well-interpreted by the chemical twinning model.
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