Ultra-small-angle neutron scattering with azimuthal asymmetry

Gu, X.; Mildner, D. F.  R.

doi:10.1107/s1600576716005586

Title: Ultra-small-angle neutron scattering with azimuthal asymmetry

Journal Article · Mon May 16 00:00:00 EDT 2016 · Journal of Applied Crystallography (Online)

DOI:https://doi.org/10.1107/s1600576716005586· OSTI ID:1345573

Gu, X. ^[1]; Mildner, D. F. R. ^[2]

Pennsylvania State Univ., University Park, PA (United States). Dept. of Geosciences
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research

Small-angle neutron scattering (SANS) measurements from thin sections of rock samples such as shales demand as great a scattering vector range as possible because the pores cover a wide range of sizes. The limitation of the scattering vector range for pinhole SANS requires slit-smeared ultra-SANS (USANS) measurements that need to be converted to pinhole geometry. The desmearing algorithm is only successful for azimuthally symmetric data. Scattering from samples cut parallel to the plane of bedding is symmetric, exhibiting circular contours on a two-dimensional detector. Samples cut perpendicular to the bedding show elliptically dependent contours with the long axis corresponding to the normal to the bedding plane. A method is given for converting such asymmetric data collected on a double-crystal diffractometer for concatenation with the usual pinhole-geometry SANS data. Furthermore, the aspect ratio from the SANS data is used to modify the slit-smeared USANS data to produce quasi-symmetric contours. Rotation of the sample about the incident beam may result in symmetric data but cannot extract the same information as obtained from pinhole geometry.

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Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER15675

OSTI ID:: 1345573

Journal Information:: Journal of Applied Crystallography (Online), Vol. 49, Issue 3; ISSN 1600-5767

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Flow-through compression cell for small-angle and ultra-small-angle neutron scattering measurements Hjelm, Rex P.; Taylor, Mark A.; Frash, Luke P. Review of Scientific Instruments, Vol. 89, Issue 5 https://doi.org/10.1063/1.5022678	journal	May 2018
Effect of grain-boundary diffusion process on the geometry of the grain microstructure of $Nd − Fe − B$ nanocrystalline magnets Titov, Ivan; Barbieri, Massimiliano; Bender, Philipp Physical Review Materials, Vol. 3, Issue 8 https://doi.org/10.1103/physrevmaterials.3.084410	journal	August 2019
Determination of porosity in anisotropic fractal systems by neutron scattering Gu, Xin; Mildner, David F. R. Journal of Applied Crystallography, Vol. 51, Issue 1 https://doi.org/10.1107/s1600576718000080	journal	February 2018
Small-angle neutron scattering measurements of δ-phase deuteride (hydride) precipitates in Zircaloy 4 Heuser, Brent J.; Lin, Jun-Li; Do, Changwoo Journal of Applied Crystallography, Vol. 51, Issue 3 https://doi.org/10.1107/s160057671800479x	journal	May 2018
Characterization of anisotropic pores and spatially oriented precipitates in sintered Mo-base alloys using small-angle neutron scattering Karge, Lukas; Lang, David; Schatte, Jürgen Journal of Applied Crystallography, Vol. 51, Issue 6 https://doi.org/10.1107/s1600576718014474	journal	November 2018

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azimuthal asymmetric scattering
double-crystal diffractometers
elliptic scattering contours
slit-height smeared scattering
small-angle neutron scattering

Title: Ultra-small-angle neutron scattering with azimuthal asymmetry

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