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Titolo:
Structural stability of ion bombarded non-metallic systems
Autore:
Ossi, PM; Pastorelli, R;
Indirizzi:
Politecn Milan, Dipartimento Ingn Nucl, INFM, I-20133 Milan, Italy Politecn Milan Milan Italy I-20133 Ingn Nucl, INFM, I-20133 Milan, Italy
Titolo Testata:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
fascicolo: 1-4, volume: 147, anno: 1999,
pagine: 202 - 206
SICI:
0168-583X(199901)147:1-4<202:SSOIBN>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENERGETIC DISPLACEMENT CASCADES; AMORPHIZATION; TEMPERATURE; IRRADIATION; CRYSTALS; CERAMICS; SPIKES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Ossi, PM Politecnn,ilan, Dipartimento Ingn Nucl, INFM, Via Ponzio 34-3, I-20133 Mila Politecn Milan Via Ponzio 34-3 Milan Italy I-20133 I-20133 Mila
Citazione:
P.M. Ossi e R. Pastorelli, "Structural stability of ion bombarded non-metallic systems", NUCL INST B, 147(1-4), 1999, pp. 202-206

Abstract

The Segregation Charge Transfer (SCT) model, already applied to binary metallic alloys, is adapted to interpret the nucleation either of crystalline,or of vitreous phases in binary non-metallic compounds ion bombarded underconditions favourable to the formation of dense collision cascades. At thecascade-matrix interface a non-equilibrium electronic density profile develops; it is re-equilibrated by charge transfer reactions (CTRs), each involving a couple of dissimilar atoms, which are ionized. The sum of the volumes of such ionized atoms and of neutral atoms which exceed the stoichiometryratio needed by the reaction, is compared to the volume occupied in the starting compound unit cell by a prototypical stoichiometric unit. The local deformation associated to the local volume changes can be high enough to structurally destabilize the surrounding crystal. The absolute value of the relative volume variation due to a CTR has been evaluated for 26 systems. A threshold value of such a structure stability parameter, allowing us to separate crystalline from amorphized compounds has been found. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 30/03/20 alle ore 10:03:04