Local Order of Amorphous Zeolite Precursors from29Si{1H} CPMAS and27Al and23Na MQMAS NMR and Evidence for the Nature of Medium-Range Order from Neutron Diffraction

Silicate glasses have no long-range order and exhibit a short-range order that is often fairly similar to that of their crystalline counterparts. Hence, the out-of-equilibrium nature of glasses is largely encoded in their medium-range order. However, the ring size distribution—the key feature of silicate glasses’ medium-range structure—remains invisible to conventional experiments and, hence, is largely unknown. Here, by combining neutron diffraction experiments and force-enhanced atomic refinement simulations for two archetypical silicate glasses, we show that rings of different sizes exhibit a distinct contribution to the first sharp diffraction peak in the structure factor. On the basis of these results, we demonstrate that the ring size distribution of silicate glasses can be determined solely from neutron diffraction patterns, by analyzing the shape of the first sharp diffraction peak. This method makes it possible to uncover the nature of silicate glasses’ medium-range order.

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Medium-range order around titanium in a silicate glass studied by neutron diffraction with isotopic substitution

Physical Review B ◽

10.1103/physrevb.58.11322 ◽

1998 ◽

Vol 58 (17) ◽

pp. 11322-11330 ◽

Cited By ~ 49

Author(s):

L. Cormier ◽

P. H. Gaskell ◽

G. Calas ◽

A. K. Soper

Keyword(s):

Neutron Diffraction ◽

Silicate Glass ◽

Range Order ◽

Isotopic Substitution ◽

Medium Range Order ◽

Medium Range

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New insights into medium-range order around titanium in sol–gel derived silica through isotope difference neutron diffraction and reverse Monte Carlo modelling

Chemical Physics Letters ◽

10.1016/j.cplett.2004.06.005 ◽

2004 ◽

Vol 392 (4-6) ◽

pp. 503-507 ◽

Cited By ~ 7

Author(s):

D.M Pickup ◽

F.E Sowrey ◽

K.O Drake ◽

M.E Smith ◽

R.J Newport

Keyword(s):

Monte Carlo ◽

Neutron Diffraction ◽

Sol Gel ◽

Range Order ◽

Reverse Monte Carlo ◽

Medium Range Order ◽

Medium Range

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Short and Medium-Range Order in Liquid Ternary Al80Co10Ni10, Al72.5Co14.5Ni13, and Al65Co17.5Ni17.5 Alloys

Zeitschrift für Naturforschung A ◽

10.1515/zna-2010-1-214 ◽

2010 ◽

Vol 65 (1-2) ◽

pp. 123-131 ◽

Cited By ~ 2

Author(s):

Oleksandr S. Roik ◽

Oleksiy Samsonnikov ◽

Volodymyr Kazimirov ◽

Volodymyr Sokolskii

Keyword(s):

Three Dimensional ◽

Range Order ◽

Ternary Alloys ◽

X Ray Diffraction ◽

Medium Range Order ◽

Intermediate Range Order ◽

Transition Metal Atoms ◽

Medium Range ◽

Three Dimensional Models ◽

Co Alloys

AbstractA local short-to-intermediate range order of liquid Al80Co10Ni10, Al72.5Co14.5Ni13, and Al65Co17.5Ni17.5 alloys was examined by X-ray diffraction and the reverse Monte Carlo modelling. The comprehensive analysis of three-dimensional models of the liquid ternary alloys was performed by means of the Voronoi-Delaunay method. The existence of a prepeak on the S(Q) function of the liquid alloys is caused by medium range ordering of 3d-transition metal atoms in dense-packed polytetrahedral clusters at temperatures close to the liquidus. The non-crystalline clusters, represented by aggregates of pentagons that consist of good tetrahedra, and chemical short-range order lead to the formation of the medium range order in the liquid binary Al-Ni, Al-Co and ternary Al-Ni-Co alloys.

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Medium-range order in amorphous ices revealed by persistent homology

Journal of Physics Condensed Matter ◽

10.1088/1361-648x/ab3820 ◽

2019 ◽

Vol 31 (45) ◽

pp. 455403 ◽

Cited By ~ 1

Author(s):

Sungyeon Hong ◽

Donghun Kim

Keyword(s):

Persistent Homology ◽

Range Order ◽

Medium Range Order ◽

Medium Range ◽

Amorphous Ices

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The Structure of Ion-Implanted Amorphous Silicon

MRS Proceedings ◽

10.1557/proc-540-27 ◽

1998 ◽

Vol 540 ◽

Cited By ~ 4

Author(s):

J. M. Gibson ◽

J-Y. Cheng ◽

P. Voyles ◽

M.M.J. TREACY ◽

D.C. Jacobson

Keyword(s):

Amorphous Silicon ◽

Network Model ◽

Random Network ◽

Amorphous Semiconductors ◽

Range Order ◽

Medium Range Order ◽

Medium Range ◽

Large Heat ◽

Continuous Random Network ◽

Ion Implanted

AbstractUsing fluctuation microscopy, we show that ion-implanted amorphous silicon has more medium-range order than is expected from the continuous random network model. From our previous work on evaporated and sputtered amorphous silicon, we conclude that the structure is paracrystalline, i.e. it possesses crystalline-like order which decays with distance from any point. The observation might pose an explanation for the large heat of relaxation that is evolved by ion-implanted amorphous semiconductors.

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