Ring size distribution in silicate glasses revealed by neutron scattering first sharp diffraction peak analysis

2019 ◽  
Vol 516 ◽  
pp. 71-81 ◽  
Author(s):  
Ying Shi ◽  
Jörg Neuefeind ◽  
Dong Ma ◽  
Katharine Page ◽  
Lisa A. Lamberson ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Size Distribution ◽  
Diffraction Peak ◽  
Silicate Glasses ◽  
Ring Size

scholarly journals Experimental method to quantify the ring size distribution in silicate glasses and simulation validation thereof

2021 ◽  
Vol 7 (28) ◽  
pp. eabh1761
Author(s):  
Qi Zhou ◽  
Ying Shi ◽  
Binghui Deng ◽  
Jörg Neuefeind ◽  
Mathieu Bauchy
Keyword(s):  
Neutron Diffraction ◽  
Size Distribution ◽  
Diffraction Peak ◽  
Range Order ◽  
Silicate Glasses ◽  
Ring Size ◽  
Medium Range Order ◽  
Simulation Validation ◽  
Medium Range ◽  
Diffraction Patterns

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.

Study of silicate glasses with PbS nanoparticles using small-angle neutron scattering

2016 ◽  
Vol 10 (1) ◽  
pp. 187-190 ◽  
Author(s):  
S. O. Samoilenko ◽  
S. E. Kichanov ◽  
D. P. Kozlenko ◽  
O. I. Ivankov ◽  
V. S. Gurin ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Silicate Glasses ◽  
Pbs Nanoparticles

scholarly journals An integrated pore size distribution measurement method of small angle neutron scattering and mercury intrusion capillary pressure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rui Shen ◽  
Xiaoyi Zhang ◽  
Yubin Ke ◽  
Wei Xiong ◽  
Hekun Guo ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Capillary Pressure ◽  
Size Distribution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Measurement Method ◽  
Full Scale ◽  
Mercury Intrusion

AbstractSmall-angle neutron scattering and high-pressure mercury intrusion capillary pressure testing are integrated to analyze the pore size distribution of the broad sense shale oil reservoir samples of the Permian Lucaogou Formation in the Jimsar Sag, Junggar Basin, China. The results show that, compared with the measurement method integrating gas adsorption and mercury intrusion, combination of small-angle neutron scattering and mercury intrusion can more accurately characterize full-scale pore size distribution. The full-scale pore size distribution curve of the rock samples in the study area includes two types: the declining type and submicron pore-dominated type. The declining type is mainly found with silty mudstone and dolomitic mudstone, and most of its pores are smaller than 80 nm. Silt-fine sandstones and dolarenite are mostly of the submicron pores-dominated type, with most pores smaller than 500 nm. They also present large specific pore volumes and average pore diameters of macropores and are the favorable lithogenous facies for development of high-quality reservoirs.

scholarly journals MWP-fit: a program for multiple whole-profile fitting of diffraction peak profiles byabinitiotheoretical functions

2001 ◽  
Vol 34 (5) ◽  
pp. 669-676 ◽  
Author(s):  
G. Ribárik ◽  
T. Ungár ◽  
J. Gubicza
Keyword(s):  
Size Distribution ◽  
Fourier Transforms ◽  
Diffraction Peak ◽  
Hexagonal Crystal ◽  
Crystal Lattices ◽  
Microstructural Parameters ◽  
Fitting Procedure ◽  
Profile Fitting ◽  
Log Normal

A computer program has been developed for the determination of microstructural parameters from diffraction profiles of materials with cubic or hexagonal crystal lattices. The measured profiles or their Fourier transforms are fitted byabinitiotheoretical functions for size and strain broadening. In the calculation of the theoretical functions, it is assumed that the crystallites have log-normal size distribution and that the strain is caused by dislocations. Strain and size anisotropy are taken into account by the dislocation contrast factors and the ellipticity of the crystallites. The fitting procedure provides the median and the variance of the size distribution and the ellipticity of the crystallites, and the density and arrangement of the dislocations. The efficiency of the program is illustrated by examples of severely deformed copper and ball-milled lead sulfide specimens.

SANS Study of Carbon Addition in Ti–45Al–5Nb

2011 ◽  
Vol 1295 ◽  
Author(s):  
P. Staron ◽  
F.-P. Schimansky ◽  
C. Scheu ◽  
H. Clemens
Keyword(s):  
Neutron Scattering ◽  
Size Distribution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Tial Alloy ◽  
Small Volume ◽  
Volume Fraction ◽  
Atom Probe ◽  
Carbon Addition ◽  
Small Volume Fraction

ABSTRACTThe distribution of carbon in Ti–45Al–5Nb–0.5C was studied using small-angle neutron scattering (SANS). In an earlier study, carbon had been found to form small perovskite precipitates in a γ-TiAl alloy without Nb, which significantly increase the strength of the material. In the Nb-containing alloy, however, no strengthening precipitates were observed, but most of the C was found to be homogeneously distributed. Atom probe investigations revealed only few C-enriched regions. The present SANS investigation was carried out to confirm the presence and size distribution of these C-enriched regions in the material. The SANS results show that a small volume fraction of such C-enriched regions is present, while the large number of small precipitates found in the alloy without Nb is indeed missing in the Nb-containing alloy.

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