The pressure effect on Au diffusion in amorphous Pd40Ni40P20

Duine, Peter A.; Wonnell, S. K.; Sietsma, Jilt

doi:10.1016/0921-5093(94)90208-9

Cited by 19 publications

(14 citation statements)

References 13 publications

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“…In general, pressure could reduce atomic mobility, In the Pd 40 Ni 40 P 20 glass, the diffusion coefficient of Au was reported to be reduced by external pressure. 28 This means that Q n might increase with pressure. Hence, the nucleation work increases with pressure.…”

Section: Resultsmentioning

confidence: 99%

Crystallization in Pd40Ni40P20 glass

Jiang

Saksl

Nishiyama

et al. 2002

Journal of Applied Physics

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Phase segregation and the effect of pressure on crystallization of bulk and ribbon Pd 40 Ni 40 P 20 glasses have been studied by means of differential scanning calorimetry ͑DSC͒ and x-ray diffraction. The DSC measurements show only one glass transition event in the samples annealed at different temperatures in the supercooled liquid region. Phase analyses reveal at least five crystalline phases crystallized from the glass: monoclinic; body-centered tetragonal; orthorhombic; Ni 2 Pd 2 P and fcc-͑Ni,Pd͒ solid solution phases. In the pressure range from 0 to 4.2 GPa, the crystallization temperature increases with pressure having a slope of 11 K/GPa. The eutectic crystallization reaction mode and crystalline phases formed are unchanged in the pressure range used. The enhancement of the crystallization temperature with increasing pressure in the glass can be explained by the suppression of atomic mobility.

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Section: Resultsmentioning

confidence: 99%

Crystallization in Pd40Ni40P20 glass

Jiang

Saksl

Nishiyama

et al. 2002

Journal of Applied Physics

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“…This results in the determination of the formation volume for defects in amorphous Pd 40 Ni 40 P 20 . Combining the result with the pressure dependence of the diffusivity of gold determined previously on the same samples [5] yields a quantitative estimate for the migration volume for diffusion of Au in amorphous Pd 40 Ni 40 P 20 as well.Experiments were performed on a set of amorphous Pd 40 Ni 40 P 20 ribbons, being the very ribbons on which previously the pressure effect of the diffusivity has been measured [5]. The ribbons were first brought in metastable equilibrium, without inducing crystallization, by annealing at ambient pressure and a temperature of 563 K during 10 000 s. Under these conditions equilibrium is reached in approximately 5000 s [6].…”

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“…Experiments were performed on a set of amorphous Pd 40 Ni 40 P 20 ribbons, being the very ribbons on which previously the pressure effect of the diffusivity has been measured [5]. The ribbons were first brought in metastable equilibrium, without inducing crystallization, by annealing at ambient pressure and a temperature of 563 K during 10 000 s. Under these conditions equilibrium is reached in approximately 5000 s [6].…”

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“…The ribbons were first brought in metastable equilibrium, without inducing crystallization, by annealing at ambient pressure and a temperature of 563 K during 10 000 s. Under these conditions equilibrium is reached in approximately 5000 s [6]. Subsequently, the samples were annealed for 43 200 s at 563.0 6 0.1 K and hydrostatic pressures up to 0.75 GPa ͑60.01 GPa͒ in order to determine the Au diffusivity [5]. The annealing time of 43 200 s can be assumed to be long enough to attain the pressure-dependent equilibrium defect concentration, even if structural relaxation is retarded at high pressure.…”

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Pressure-Induced Structural Relaxation in AmorphousPd40Ni40P20: The Form

Ruitenberg

Hey

Sommer³

et al. 1997

Phys. Rev. Lett.

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Structural relaxation induced by hydrostatic pressure is experimentally observed for the metallic glass Pd 40 Ni 40 P 20 . The pressure dependence of the structural state is displayed in the shape of the glasstransition peak that is measured by means of differential scanning calorimetry after annealing treatments at 563 K and pressures up to 0.75 GPa. Quantification of the effect using the free-volume theory yields a formation volume of 5.9 6 0.5 Å 3 for defects in this glass. In combination with the previously determined pressure dependence for the Au diffusivity, a value of 5 6 4 Å 3 is derived for the migration volume for Au diffusion. [S0031-9007(97) PACS numbers: 61.43. Dq, 61.72.Hh, 62.50. + p, Structural relaxation in metallic glasses under the influence of an elevated temperature is a well-known phenomenon that has been widely studied (e.g., [1]). Within the amorphous structure, changes occur that lead to significant changes in physical properties, which are particularly pronounced in the atomic-transport properties viscosity and diffusivity [2]. Although pressure, similar to temperature, is liable to induce structural relaxation as well, experimental studies of pressure-induced structural relaxation are very few [3]. The pressure dependence of the structural state of metallic glasses is particularly of interest when regarding the diffusion process, since it can give insight into the formation volume for defects. Combined with the pressure dependence of the diffusivity, which yields the so-called activation volume, the migration volume for diffusion can also be derived. A separate determination of these two quantities adds to the understanding of the diffusion process.In the present Letter the phenomenon of structural relaxation induced by pressure will be investigated for the metallic glass Pd 40 Ni 40 P 20 . Experimental evidence obtained by means of differential scanning calorimetry (DSC) after annealing samples at hydrostatic pressures up to 0.75 GPa directly shows the occurrence of pressureinduced structural relaxation. The state of relaxation that is reached during these treatments is quantified by means of the free-volume theory [2,4]. This results in the determination of the formation volume for defects in amorphous Pd 40 Ni 40 P 20 . Combining the result with the pressure dependence of the diffusivity of gold determined previously on the same samples [5] yields a quantitative estimate for the migration volume for diffusion of Au in amorphous Pd 40 Ni 40 P 20 as well.Experiments were performed on a set of amorphous Pd 40 Ni 40 P 20 ribbons, being the very ribbons on which previously the pressure effect of the diffusivity has been measured [5]. The ribbons were first brought in metastable equilibrium, without inducing crystallization, by annealing at ambient pressure and a temperature of 563 K during 10 000 s. Under these conditions equilibrium is reached in approximately 5000 s [6]. Subsequently, the samples were annealed for 43 200 s at 563.0 6 0.1 K and hydrostatic pressures up to 0.75 GPa ͑60...

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