Neutron Larmor diffraction on powder samples
| Autor: | Radosław Przeniosło, Bernhard Keimer, Piotr Fabrykiewicz, I. Sosnowska, Thomas Keller |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
neutron Larmor diffraction Materials science polycrystalline samples Resolution (electron density) powder diffraction Synchrotron radiation neutron spin–echo 02 engineering and technology Neutron scattering 021001 nanoscience & nanotechnology Research Papers 01 natural sciences General Biochemistry Genetics and Molecular Biology Neutron spin echo 0103 physical sciences Neutron Crystallite Atomic physics 010306 general physics 0210 nano-technology Powder diffraction |
| Zdroj: | Journal of Applied Crystallography |
| ISSN: | 1600-5767 |
| Popis: | A method to analyse neutron Larmor diffraction data from polycrystalline samples is presented. A hitherto unrecognized resolution effect in neutron Larmor diffraction (LD) is reported, resulting from small-angle neutron scattering (SANS) in the sample. Small distortions of the neutron trajectories by SANS give rise to a blurring of the Bragg angles of the order of a few hundredths of a degree, leading to a degradation of the momentum resolution. This effect is negligible for single crystals but may be significant for polycrystalline or powder samples. A procedure is presented to correct the LD data for the parasitic SANS. The latter is accurately determined by the SESANS technique (spin–echo small-angle neutron scattering), which is readily available on Larmor diffractometers. The analysis technique is demonstrated on LD and SESANS data from α-Fe2O3 powder samples. The resulting d-spacing range agrees with experimental data from high-resolution synchrotron radiation powder diffraction on the same sample. |
| Databáze: | OpenAIRE |
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