Thermal behavior of indium nanoclusters in ion-implanted silica. Tagliente, M. A., Mattei, G., Tapfer, L., Antisari, M. V., & Mazzoldi, P. Physical Review B, 70(7):075418, 2004. Copyright (C) 2009 The American Physical Society; Please report any problems to prola@aps.org
Thermal behavior of indium nanoclusters in ion-implanted silica [link]Paper  doi  abstract   bibtex   
Fused silica substrates were implanted with 2×1017 In2+∕cm2 ions at 320 keV . Indium crystalline nanoclusters with an average size of about 15–20 nm were found in the as-implanted samples. The thermal behavior of the nanoclusters was studied by performing heating-cooling cycles in vacuum and by using in-situ techniques based on glancing-incidence x-ray diffraction and transmission electron microscopy. The precipitates showed both superheating and supercooling. Moreover, no evidence of clusters growth or reorientation during the thermal cycle was found. A detailed study of the heating sequence showed that the melting temperature of the Indium precipitates depended on their size, i.e., the smallest particles melt first and at a temperature which is about 7 K below the bulk melting point, while the largest ones were superheated until about 13 K above it. Moreover, a remarkable stability of the In cluster well above their melting temperature (up to about 980 K ) was evidenced by in-situ transmission electron microscopy analysis. From a thermodynamic point of view, the experimental results were explained by considering two effects acting on the clusters: the thermodynamic size effect and the pressure of the silica matrix.
@article{tagliente_thermal_2004,
	title = {Thermal behavior of indium nanoclusters in ion-implanted silica},
	volume = {70},
	url = {http://link.aps.org/abstract/PRB/v70/e075418},
	doi = {10.1103/PhysRevB.70.075418},
	abstract = {Fused silica substrates were implanted with 2×1017 In2+∕cm2 ions at 320 keV . Indium crystalline nanoclusters with an average size of about 15–20 nm were found in the as-implanted samples. The thermal behavior of the nanoclusters was studied by performing heating-cooling cycles in vacuum and by using in-situ techniques based on glancing-incidence x-ray diffraction and transmission electron microscopy. The precipitates showed both superheating and supercooling. Moreover, no evidence of clusters growth or reorientation during the thermal cycle was found. A detailed study of the heating sequence showed that the melting temperature of the Indium precipitates depended on their size, i.e., the smallest particles melt first and at a temperature which is about 7 K below the bulk melting point, while the largest ones were superheated until about 13 K above it. Moreover, a remarkable stability of the In cluster well above their melting temperature (up to about 980 K ) was evidenced by in-situ transmission electron microscopy analysis. From a thermodynamic point of view, the experimental results were explained by considering two effects acting on the clusters: the thermodynamic size effect and the pressure of the silica matrix.},
	number = {7},
	urldate = {2009-10-13TZ},
	journal = {Physical Review B},
	author = {Tagliente, M. A. and Mattei, G. and Tapfer, L. and Antisari, M. Vittori and Mazzoldi, P.},
	year = {2004},
	note = {Copyright (C) 2009 The American Physical Society; Please report any problems to prola@aps.org},
	pages = {075418}
}

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