From a realistic n-body potential of the Ni-Ti system, the critical concentrations of the Ni-and Tirich solid solutions were determined by molecular dynamics (MD) simulation to be 38 at% Ti and 15 at% Ni, respectively, beyond which a disordered atomic configuration was more stable than the respective crystalline solid solutions. It follows that the central composition range bounded by the critical solubilities, i.e. within 38-85 at% of Ti, can be considered as the glass-forming range of the system, which was confirmed by room temperature 200 keV xenon ion mixing of alternately deposited Ni-Ti multilayered films. Moreover, MD simulation of a Ni-Ti bilayer revealed that during the solid-state amorphization reaction, the growth of the amorphous interlayer followed exactly a t 1/2 law and grew faster towards the Ti lattice than to the Ni side. The physical origin of such an asymmetric behaviour was found to be due to a difference in critical solid solubilty of the constituent metals.
Influence of defect structure on the infrared transmission spectra of OH -in Zn:Fe:LiNbO 3 crystals with various ZnO concentration and different Li/Nb ratios was investigated. It indicates that above the Zn concentration threshold the OH -absorptions bands successively shift from 3482cm -1 to 3504cm -1 and 3529cm -1 . The intensity of the 3504cm -1 band increases with ZnO concentration increasing. The optical damage resistance of the Zn:Fe:LiNbO 3 crystals increases rapidly when the ZnO concentration exceeds a threshold value. This result contributed to the site alteration from the Li sites to Nb sites due to Zn-doping in crystal.
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