Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Formation of core-shell and hollow nanospheres through the nanoscale melt-solidification effect in the Sm-Fe(Ta)-N system
Δημιουργός/Συγγραφέας:	Sturm, S. Rozman, K. Zuzek Markoli, B. [EL] Σαραντοπούλου, Ευαγγελία[EN] Sarantopoulou, Evangelia [EL] Κόλλια, Ζωή[EN] Kollia, Zoe [EL] Κεφαλάς, Αλκιβιάδης Κωνσταντίνος[EN] Cefalas, Alciviadis Constantinos Kobe, S.
Εκδότης:	Iop Publishing Limited
Τόπος έκδοσης:	Bristol
Ημερομηνία:	2010-12-03
Γλώσσα:	Αγγλικά
ISSN:	0957-4484
DOI:	10.1088/0957-4484/21/48/485603
Περίληψη:	Sm-Fe-Ta-N-O nanospheres were synthesized by pulsed-laser deposition from a Sm(13.8)Fe(82.2)Ta(4.0) target in a nitrogen atmosphere. Three structurally and compositionally distinct types were identified: amorphous, core-shell and hollow nanospheres. Amorphous spheres were compositionally homogeneous and completely oxidized. The core-shell spheres were composed of an iron-rich crystalline core with up to 10 at.% interstitially incorporated nitrogen, surrounded by an amorphous and oxidized shell. The hollow spheres were characterized by voids filled with N(2) gas. It was found that the formation of either amorphous or complex nanospheres is defined by an initial Fe/Sm ratio within the molten droplet. The formation of hollow spheres is believed to be related to the general affinity of liquid metals for gas intake. During rapid solidification the dissolved gas in the melt is trapped within the surrounding solid rim, preventing the outwards diffusion of gas. As long as the amount of gas atoms in the melt is kept below its solubility limits it can be completely interstitially incorporated into the solid, thus forming crystalline Fe(N)-rich cores. If the melt contains more than an equilibrium amount of nitrogen it is possible that the gas recombines to form N(2) molecules, which are condensed inside the spheres.
Τίτλος πηγής δημοσίευσης:	Nanotechnology
Τόμος/Κεφάλαιο:	21
Τεύχος:	48
Σελίδες:	[8]
Θεματική Κατηγορία:	[EL] Επιστήμη (Γενικά)[EN] Science (General) [EL] Τεχνολογία (Γενικά)[EN] Technology (General) [EL] Φυσική[EN] Physics
Λέξεις-Κλειδιά:	Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© IOP PUBLISHING LTD
Ηλεκτρονική διεύθυνση περιοδικού (link) :	http://www.iop.org/EJ/journal/Nano
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο