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[资源] 推荐一篇nature materials非晶结构文章

Power-law scaling and fractal nature of medium-range order in metallic glasses

D.Ma, A. D. Stoica and X.-L.Wang*

The atomic structure of metallic glasses has been a
long-standing scientiﬁc problem. Unlike crystalline metals,
where long-range ordering is established by periodic stacking
of fundamental building blocks known as unit cells, a metallic
glass has no long-range translational or orientational order,
although some degrees of short- and medium-range order do
exist
1–3
. Previous studies1–4 have identiﬁed solute- (minority
atom)-centred clusters as the fundamental building blocks
or short-range order in metallic glasses. Idealized cluster
packing schemes, such as efﬁcient cluster packing on a cubic
lattice1
and icosahedral packing3
as in a quasicrystal, have
been proposed and provided ﬁrst insights on themedium-range
order in metallic glasses. However, these packing schemes
break down beyond a length scale of a fewclusters.Here, on the
basis of neutron and X-ray diffraction experiments, we propose
a new packing scheme—self-similar packing of atomic clusters.
We show that the medium-range order has the characteristics
of a fractal network with a dimension of 2.31, and is described
by a power-law correlation function over the medium-range
length scale. Our ﬁnding provides a new perspective of
order in disordered materials and has broad implications
for understanding their structure–property relationship,
particularly those involving a change in length scales.

http://www.namipan.com/d/26a3733 ... 9ade525a1a89f2b2500
http://www.namipan.com/d/26a373380ea5dc1e9c01dd1849f179ade525a1a89f2b2500

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