Metastable phases synthesized by inert-gas-condensation
1997; Elsevier BV; Volume: 9; Issue: 1-8 Linguagem: Inglês
10.1016/s0965-9773(97)00030-5
ISSN1872-9150
Autores Tópico(s)Material Dynamics and Properties
ResumoUsing the inert-gas condensation method we have produced metastable phases of Ta, W and Y2O3. The formation of these phases results from both the undercooling achieved during inert-gas condensation as well as the surface-tension-induced increase in pressure with decreasing particle size. For example, we have found that Y2O3 can be synthesized in the equilibrium cubic phase (α-Y2O3) as well as in the high-pressure monoclinic phase (γ-Y2O3) by varying the preparation conditions. The resulting crystal structure is found to be determined by the crystallite size 〈D〉. Based on these observations it is shown that by utilizing-inert gas condensation one can prepare metastable structures and alloys that can hardly be synthesized by classical metallurgical processes.
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