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(a) Mixing enthalpy of as a function of Al content , for different fixed fractions of N between and , relative to and . (b) Mixing enthalpy of as a function of N content for different fixed Ti-to-Al ratios, relative to and fcc .
Formation energy of in the composition space.
Energetically prefered decomposition pattern of in composition space. The arrows point in the direction in which a phase separation would be most energetically favorable. Their length indicate the magnitude of this energy. Just a dot indicates that there is no chemical driving force for nucleation-free phase separation. The directions of the arrows are approximate. The optimal direction can be in between the directions considered here.
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