%0 Book Section %1 statphys23_0433 %A Lereah, Y. %A Be'er, A. %A Phillipp, F. %A Kofman, R. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K crystalline defects melted nano particles quasi state statphys23 topic-6 %T Quantitative Characterization of Quasi Melted State in Nanoparticles %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=433 %X The phenomenon of spontaneous instabilities of Pb and Bi nanoparticles was studied quantitatively by time resolved transmission electron microscopy (TEM) at atomic resolution. Two characteristic times were found to be relevant with the phenomenon of the instabilities; both were measured as function of particle's size, of temperature and of the electron beam energy of the microscope. The results indicate that the phenomenon of instabilities is thermal activated process and not a result of the electron beam. Accordingly, the instabilities are interpreted as quasi-melted state. Based on the quantitative results, the energies relevant to the quasi melted states of Pb and Bi nano-particle are found. The atomic resolution analysis of the quasi melting state indicates a correlation with defects motion in the nanoparticles. These experimental findings are calling for comparison with theories on pre-cursor effects of melting (Oldham and Ubbelohde 1940, Mott 1952, Kosterlitz and Thouless 1976). The nature of Solid-Liquid transition for Nanoparticles will be discussed. References: 1. A. Be'er, R. Kofman, F. Phillipp and Y. Lereah, Physical Review B 74 224111 (2006) 2. A. Be'er, R. Kofman, F. Phillipp and Y. Lereah, to be published 3. T. Ben-David, Y. Lereah, G. Deutscher, J.M. Penisson, A. Bourret, R. Kofman and P. Cheyssac, Physical Review Letters, 78, 2585 (1997)

@incollection{statphys23_0433, abstract = {The phenomenon of spontaneous instabilities of Pb and Bi nanoparticles was studied quantitatively by time resolved transmission electron microscopy (TEM) at atomic resolution. Two characteristic times were found to be relevant with the phenomenon of the instabilities; both were measured as function of particle's size, of temperature and of the electron beam energy of the microscope. The results indicate that the phenomenon of instabilities is thermal activated process and not a result of the electron beam. Accordingly, the instabilities are interpreted as quasi-melted state. Based on the quantitative results, the energies relevant to the quasi melted states of Pb and Bi nano-particle are found. The atomic resolution analysis of the quasi melting state indicates a correlation with defects motion in the nanoparticles. These experimental findings are calling for comparison with theories on pre-cursor effects of melting (Oldham and Ubbelohde 1940, Mott 1952, Kosterlitz and Thouless 1976). The nature of Solid-Liquid transition for Nanoparticles will be discussed. References: 1. A. Be'er, R. Kofman, F. Phillipp and Y. Lereah, Physical Review B 74 224111 (2006) 2. A. Be'er, R. Kofman, F. Phillipp and Y. Lereah, to be published 3. T. Ben-David, Y. Lereah, G. Deutscher, J.M. Penisson, A. Bourret, R. Kofman and P. Cheyssac, Physical Review Letters, 78, 2585 (1997)}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Lereah, Y. and Be'er, A. and Phillipp, F. and Kofman, R.}, biburl = {https://www.bibsonomy.org/bibtex/2863fdbc35e7b6113d2288e6346f8f9d3/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {17d4a9c20d5e1d61acbaa3f582940f8f}, intrahash = {863fdbc35e7b6113d2288e6346f8f9d3}, keywords = {crystalline defects melted nano particles quasi state statphys23 topic-6}, month = {9-13 July}, timestamp = {2007-06-20T10:16:20.000+0200}, title = {Quantitative Characterization of Quasi Melted State in Nanoparticles}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=433}, year = 2007 }