Structural behavior of Pd[sub 40]Cu[sub 30]Ni[sub 10]P[sub 20] bulk metallic glass below and above the glass transition

Mattern, Norbert; Hermann, Helmut; Roth, Stefan; Sakowski, Jan; Macht, Michael-Peter; Jovari, Pal; Jiang, Jianzhong
April 2003
Applied Physics Letters;4/21/2003, Vol. 82 Issue 16, p2589
Academic Journal
The thermal behavior of the structure of Pd[SUB40]Cu[SUB30]Ni[SUB10]P[SUB20] bulk metallic glass has been investigated in situ through the glass transition by means of high-temperature x-ray synchrotron diffraction. The dependence of the x-ray structure factor S(q) of the Pd[SUB40]Cu[SUB30]Ni[SUB10]P[SUB20] glass on temperature follows the Debye theory up to the glass transition with a Debye temperature θ = 296 K. Above the glass transition temperature T[SUBg], the temperature dependence of S(q) is altered, pointing to a continuous development of structural changes in the liquid with temperature. The atomic pair correlation functions g(r) indicate changes in short-range-order parameters of the first and the second neighborhood with temperature. The temperature dependence of structural parameters is different in glass and in supercooled liquid, with a continuous behavior through the glass transition. The nearest-neighbor distance decreases with temperature, changing the slope at T[SUBg]. The interatomic distances of higher coordination shells expand analogously to the macroscopic linear thermal expansion.


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