Anomalous neutron scattering `halo' observed in highly oriented pyrolytic graphite

He, Lilin; Li, Chen; Hamilton, William A.; Hong, Tao; Tong, Xin Tony; Winn, Barry L.; Crow, Lowell; Bailey, Katherine M.; Gallego, Nidia C.

doi:10.1107/S1600576719001110

Title: Anomalous neutron scattering `halo' observed in highly oriented pyrolytic graphite

Journal Article · Tue Mar 05 00:00:00 EST 2019 · Journal of Applied Crystallography (Online)

DOI:https://doi.org/10.1107/S1600576719001110· OSTI ID:1515703

^[1]; Li, Chen ^[2];

^[1];

^[3]; Winn, Barry L. ^[1]; Crow, Lowell ^[2]; Bailey, Katherine M. ^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California, Riverside, CA (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Dongguan Neutron Science Center, Dongguan (People's Republic of China)

Highly oriented pyrolytic graphite (HOPG) has been used as monochromators, analyzers and filters at neutron and X-ray scattering facilities for more than half a century. Interesting questions remain. In this work, the first observation of anomalous neutron `halo' scattering of HOPG is reported. The scattering projects a ring onto the detector with a half-cone angle of 12.4°, which surprisingly persists to incident neutron wavelengths far beyond the Bragg cutoff for graphite (6.71 Å). At longer wavelengths the ring is clearly a doublet with a splitting roughly proportional to wavelength. Sample tilting leads to the shift of the ring, which is wavelength dependent with longer wavelengths providing a smaller difference between the ring shift and the sample tilting. The ring broadens and weakens with decreasing HOPG quality. The lattice dynamics of graphite play a role in causing the scattering ring, as shown by the fact that the ring vanishes once the sample is cooled to 30 K. A possible interpretation by multiple scattering including elastic and inelastic processes is proposed.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1515703

Journal Information:: Journal of Applied Crystallography (Online), Vol. 52, Issue 2; ISSN 1600-5767

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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