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Irradiation-Induced Amorphization

Figure 7. Comparison of experimental measurement of amorphous fraction accumulation as a function of dose with curves fit to various models for irradiation induced amorphization (modified after Weber 2000). Figure 7. Comparison of experimental measurement of amorphous fraction accumulation as a function of dose with curves fit to various models for irradiation induced amorphization (modified after Weber 2000).
A number of criteria have been proposed for the evaluation of the susceptibility of a material to ion irradiation-induced amorphization ionicity (Naguib and Kelly 1975) crystallization temperature (Naguib and Kelly 1975) structural topology (Hobbs 1994) bonding and structure (SX Wang et al. 1998b). [Pg.348]

The S parameter provides a significant improvement over criteria that only consider the topology of a structure. However, this approach still, in some cases, fails to predict which materials are susceptible to irradiation-induced amorphization (SX Wang et al. [Pg.349]

Hobbs LW (1994) Topology and geometry in the irradiation-induced amorphization of irrsrrlators. Nucl InstrMethB91 30-42... [Pg.357]

Meldram A, Boatner LA, White CW, Ewing RC (2000b) Ion irradiation effects in nomnetals Formation of nanocrystals and novel microstractures. Mater Res limovations 3 190-204 Meldram A, White CW, Keppens V, Boatner LA, Ewing RC (2000c) Irradiation-induced amorphization of Cd2Nd207 pyrochlore. Can J Phys (submitted)... [Pg.358]

Motta AT, Olander DR (1990) Theory of electron-irradiation-induced amorphization. Acta Materialia 38 2175-2185... [Pg.358]

Pabst A, Hutton CO (1951) Huttonite a new monoclinic thorium silicate. Am Mineral 36 60-69 Pedraza DF (1986) Mechanisms of the electron irradiation-induced amorphous transition in intermetallic compounds. J Mater Res 1 425-441... [Pg.358]

Weber WJ (2000) Models and mechanisms of irradiation-induced amorphization in ceramics. Nucl Instr Meth (in press)... [Pg.360]

Besides the mechanical alloying of elemental powders, ball-milling of an intermetallic compound can also lead to amorphization, as demonstrated for several alloys [3.18, 19, 130, 131] (for more details see Chap. 2). This cannot be explained by the above statements, since in this case no composition-induced destabilization provides the driving force for an interdiffusion reaction. Amorphization by milling starting from powders of crystalline intermetallics is attributed instead to the accumulation of lattice defects - mainly the creation of antiphase boundaries - which raise the free enthalpy of the faulted intermetallic above that of the amorphous alloy. Therefore, there exists some similarity with irradiation-induced amorphization [3.20]. [Pg.116]

Hobbs LW, Sreeram AN, Jesumm CE, Berger, BA (1996) Structural freedom, topological disorder, and the irradiation-induced amorphization of ceramic stiuctures. Nucl Instr Meth Phys Res B116 18-25 Hong, HYP (1976) Crystal stiuctures and crystal chemistiy in the system Nai+xZr2SixP3-xOi2. Mater Res Bull 11 173-182... [Pg.695]

Crystallization and reduction of sol-gel prepared zinc oxide films derived from zinc acetate by irradiation with an UV lamp (185 and 254 nm) was studied (Asakuma et al. 2003). UV irradiation induced the formation of hexagonal ZnO crystals from amorphous ZnO films preheated at 100 C, while irradiation of porous ZnO films preheated at 60 C led also to formation of metallic zinc. Composite ZnO/Cu and ZnO/Ag/Cu nanostructures were prepared via the photocatalytic reduction (wavelength 310-390 nm) of cuprous chloride and silver nitrate over the chemically prepared ZnO nanoparticles in aqueous solution (Shvalagin et al. 2004). Amorphous ZnO thin films were prepared... [Pg.87]

FIGURE 18.13 TEM image of the crystalline diamond core and amorphous carbon sheath. (Reprinted from Nucl. Instrum. Methods Phys. Res. B, 228, Sun, L.T., Gong, J.L., Wang, Z.X. et al.. Irradiation-induced phase transformations in carbon nanostructures, 26-30, Copyright 2005, with permission from Elsevier.)... [Pg.442]

Figure 2.4 Scheme for investigating structure formation (crystallization and melting) in semicrystalline polymers through the technique of irradiation-induced cross-iinking and fixation at temperatures in the melting range. After fixation of the amorphous phase in each case, the structure formed can be studied by TEM [6, 7]... [Pg.126]

Romero J. S., Fizgerald A. G., and Mietzsch K., Electron irradiation induced expansion in amorphous chalcogenide films,/. Appi Phys., 91, 9572-9574 (2002). [Pg.92]

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See also in sourсe #XX -- [ Pg.181 , Pg.182 , Pg.198 ]



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