Size-induced thermal thermodynamic hysteresis in nanopowder undergoing structural transitions-from particular case to general behaviour

作者：Shirinyan Aram^*; Bilogorodskyy Yuriy

来源：Phase Transitions, 2009, 82(7): 551-565.

DOI：10.1080/01411590903124189

• Gibbs free energy
• nanoparticle
• nucleation
• temperature change
• structural phase transition
• size-induced thermodynamic hysteresis

We present the analysis for the description of a structural transition of Fe-nanoparticle ensemble subjected to temperature change. The existence of a size-induced hysteresis for the volume fraction of the new phase is demonstrated. It is shown that this may be thermodynamic effect existing under the limitations to realization of the ergodic hypothesis. The thermodynamic hysteresis arises from the nonsymmetry of transforming path of the nanosystem with respect to the initial conditions that is due to the dependence of the phase transformation on the mechanisms of nucleation of a new phase. Moreover, it is argued here that in nanosystems it is required to differentiate the kinetic hysteresis and 'thermodynamic' hysteresis in the first order phase transition.

• 出版日期2009