In Situ Neutron Diffraction
In Situ Neutron Diffraction - Related Videos
11:25
In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
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Cited by 7 •
2014
We describe the design and construction of an electrochemical cell for the examination of electrode materials using in situ neutron powder diffraction (NPD). We briefly comment on alternate in situ NPD cell designs and discuss methods for the analysis of the corresponding in situ NPD data produced using this cell.
09:31
X-ray Diffraction
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2023
Source: Faisal Alamgir, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA X-ray diffraction (XRD) is a technique used in materials science for determining the atomic and molecular structure of a material. This is done by irradiating a sample of the material with incident X-rays and then measuring the intensities and scattering angles of the X-rays that are scattered by the material. The intensity of the scattered X-rays are plotted as a function of the...
02:18
Interference and Diffraction
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2020
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other. Alternatively, if the two waves coincide and interact in a way such that the trough of one wave coincides with the peak of the other (in an out of phase manner), the resultant wave will...
08:41
Interference and Diffraction
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Interference and diffraction are characteristic phenomena of waves, ranging from water waves to electromagnetic waves such as light. Interference refers to the phenomenon of when two waves of the same kind overlap to give an alternating spatial variation of large and small wave amplitude. Diffraction refers to the phenomenon of when a wave passes through an aperture or...
09:08
Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
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Cited by 27 •
2014
A shear cell is developed for small-angle neutron scattering measurements in the velocity-velocity gradient plane of shear and is used to characterize complex fluids. Spatially resolved measurements in the velocity gradient direction are possible for studying shear-banding materials. Applications include investigations of colloidal dispersions, polymer solutions, and self-assembled structures.
FAQs
As a sample experiences a controlled condition, its measured diffraction pattern can change. These changes provide evidence of altered lattice spacing and can indicate when phases transform, stresses develop, or crystallographic orientations become preferentially aligned. Because measurements occur during the condition rather than only afterward, engineers can relate the sequence of structural responses to the applied environment.
Neutrons penetrate deeply into materials, allowing diffraction measurements to probe bulk regions rather than relying only on near-surface information. This capability is especially useful when internal structure changes under load, temperature, or chemical exposure. The resulting measurements can reveal how the interior of a component responds, supporting more representative evaluations of deformation and material performance.
The diffraction response can provide information about several different structural outcomes. Changes in lattice spacing relate to internal deformation, while alterations associated with phases can reveal transformations. Measurements can also identify residual stress and texture, meaning preferred crystallographic orientation. Considering these signals together helps separate different mechanisms that may occur under the same service or processing condition.
A researcher places the material under a selected condition, such as mechanical loading, temperature variation, or chemical exposure, and records diffraction patterns as the condition proceeds. The evolving patterns are then examined for changes in lattice spacing, phase state, residual stress, and texture. Comparing these structural changes with the applied condition reveals how the material responds over time.
Engineers would choose this approach when the progression of internal structural change matters, not just the final state. Measurements collected during loading, heating, or chemical exposure can show when deformation, phase transformation, stress development, or texture evolution occurs. That time-dependent information helps connect a processing or service condition with the mechanisms responsible for material behavior and failure.
In Situ Neutron Diffraction supplies experimental evidence about how materials change internally under realistic controlled conditions. Engineers can use the observed lattice, phase, stress, and texture responses to evaluate proposed deformation or transformation mechanisms and to validate computational models. The results also inform material design and the development of components intended to operate reliably in demanding environments.