کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1522090 | 1511815 | 2014 | 4 صفحه PDF | دانلود رایگان |
• Size-dependent phase transition pressure for nanocrystals is discussed.
• Variation tendencies of phase transition pressure can be determined.
• Surface energy, surface stress and gram-atom volume are the decisive parameters.
• Individual contributions of surface energy and surface stress are clarified.
• Model predictions agree well with the experimental and theory results.
A critical rule without free parameters to estimate the size-dependent enhancement or reduction of phase transition pressure ΔPe(D) for phase transitions of nanocrystals is established where D denotes the size of nanocrystals. ΔPe(D) function is determined by D, surface energy γ, surface stress f and gram-atom volume Vg of the two transition phases. Also, the individual contributions of γ and f on ΔPe(D) can be separated. Our model predictions agree well with the corresponding experimental and theoretical results. This model is of fundamental significance in understanding the essence of size-dependent pressure induced phase transition and guiding the experimental scientists to estimate their results.
Journal: Materials Chemistry and Physics - Volume 147, Issues 1–2, 15 September 2014, Pages 95–98