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                           زیست شناسی:: 
                            تبدیل فاز
                        
                        7 Phase Transformations of Nanoparticles  135
7.3 Phase Transformations of Nanoparticles  139
7.4 Phase Transformation and Coagulation  148
however, if the initial grain size is less than about 20 nm an amount of released  surface energy, which is in the range of the free enthalpy for the tetragonal- monoclinic phase transformation, is realized.
The free enthalpy of formation (DGZrO2 ) and the free enthalpy of the monoclinic-tetragonal phase transformation (DGmonoc-tetr) is plotted for comparison.
 
                        
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