Clayton Anderson Neutron Scattering Phys 211A - Solid State Physics 1 17 December 2014.

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Presentation transcript:

Clayton Anderson Neutron Scattering Phys 211A - Solid State Physics 1 17 December 2014

Outline Basic Principles - Scattering, Bragg’s law - Elastic vs. Inelastic - Coherent vs. Incoherent - Neutron specific properties - Penetration Depth - Small Cross Sections - Generating the beam Applications - “Generic” neutron scattering - Powdered neutron diffraction - Magnetic Scattering Atomic Structure of a HEA - What is a HEA? - Results

Basic Principles A beam of neutrons impinges on a sample, resulting in scattering. Scattering occurs for specific orientations of the crystal and specific wavelengths of the neutrons. This relationship is given by Bragg’s law: Neutrons do not have an electronic charge, so they scatter off nuclei instead of electron clouds. Small probability of scattering Penetration Depth Scattering amplitude depends on neutron - nuclei interaction

Marder, chapter 3Pynn, Chapter 2

How do we get neutrons? Generating the Beam Spallation: high-energy protons impact on liquid mercury, ejecting neutrons. Nuclear Fission Reactors: neutrons are generated by the decay of Uranium n+ 235 U −→ 236 U −→ 92 Kr+ 141 Ba+ 3n

Oak Ridge National Laboratory

Coherent Scattering - Interference between neutrons that scatter from different nuclei. Incoherent Scattering - Interference between neutrons that scatter from the same nuclei. Elastic Scattering - No energy is transferred upon collision Inelastic Scattering - Some energy is transferred upon collision Types of Scattering Coherent elastic scattering is the “usual stuff.” Coherent inelastic scattering yields information about the vibrations of the crystal (phonons). Incoherent elastic scattering is noise. Incoherent inelastic scattering provides information about atomic diffusion.

Neutron doesn’t have electronic charge, but it has a magnetic moment due to its quark composition. For magnetic scattering, only the component perpendicular to the scattering vector can impact the scattering. Magnetic Neutron Scattering

Neutron beam scatters off a powdered crystal sample, which includes all orientations of crystal planes. This results in rings corresponding to different atomic planes. Powdered Neutron Scattering

Example of actual data Guo,Local Atomic Structure HEA = High entropy alloy Results of x-ray and neutron scattering lead show that ZrNbHf has an average b.c.c. structure, but is distorted towards f.c.c.