Power laws in pressure-induced structural change of glasses

Huijun Zhang, Kaiyao Qiao and Yilong Han ()
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Huijun Zhang: The Hong Kong University of Science and Technology
Kaiyao Qiao: The Hong Kong University of Science and Technology
Yilong Han: The Hong Kong University of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Many glasses exhibit fractional power law (FPL) between the mean atomic volume va and the first diffraction peak position q1, i.e. $$v_{\mathrm{a}} \propto q_1^{ - d}$$va∝q1−d with d ≃ 2.5 deviating from the space dimension D = 3, under compression or composition change. What structural change causes such FPL and whether the FPL and d are universal remain controversial. Here our simulations show that the FPL holds in both two- and three-dimensional glasses under compression when the particle interaction has two length scales which can induce nonuniform local deformations. The exponent d is not universal, but varies linearly with the deformable part of soft particles. In particular, we reveal an unexpected crossover regime with d > D from crystal behavior (d = D) to glass behavior (d

Date: 2020
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DOI: 10.1038/s41467-020-15583-4

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