Neutron diffraction

About: Neutron diffraction is a research topic. Over the lifetime, 26415 publications have been published within this topic receiving 597194 citations. The topic is also known as: elastic neutron scattering.

Transmission electron microscopy and diffractometry of materials

Abstract: Diffraction Geometry and the X-Ray Powder Diffractometer.- The TEM and Its Optics.- Scattering.- Inelastic Electron Scattering and Spectroscopy.- Diffraction from Crystals.- Electron Diffraction and Crystallography.- Diffraction Contrast in TEM Images.- Diffraction Lineshapes.- Patterson Functions and Diffuse Scattering.- High Resolution TEM Imaging.- Dynamical Theory.- Appendix.

Combined texture and structure analysis of deformed limestone from time-of-flight neutron diffraction spectra

Abstract: The orientation distribution of a textured polycrystalline material has been traditionally determined from a few individual pole figures of lattice planes hkl, measured by x-ray or neutron diffraction A new method is demonstrated that uses the whole diffraction spectrum, rather than extracted peak intensities, by combining the orientation distribution calculation with the crystallographic Rietveld method The feasibility of the method is illustrated with time-of-flight neutron diffraction data of experimentally deformed polycrystalline calcite It is possible to obtain quantitative information on texture, crystal structure, microstructure, and residual stress from highly incomplete pole figures and from regions of the diffraction spectrum containing many overlapping peaks The approach provides a key for quantitative texture analysis of low symmetry compounds and of composites with complicated diffraction spectra

Magnetic Structures of MnO, FeO, CoO, and NiO

Abstract: The antiferromagnetic arrangement of moments in MnO, FeO, CoO, and NiO have been investigated by powder neutron diffraction. The results for the four oxides are consistent with a structure in which the magnetic moments are arrayed in ferromagnetic sheets parallel to (111) planes, and the direction of magnetization in neighboring planes is antiparallel. The observation of diffuse neutron scattering limits the precision with which the magnetization direction can be specified. If the diffuse intensity is included with the Bragg scattering, the direction of magnetization in MnO, and NiO lies within the (111) plane; for CoO, the preferred direction is [$\overline{1}\overline{1}7$], intermediate to the (111) plane and the tetragonal axis. The magnetic axis in FeO is perpendicular to the ferromagnetic sheet.

Chemistry and physics of supramolecular magnetic materials.

Abstract: The building of multidimensional magnetic materials obtained with the molecular precursor [Cu(opba)]2- is described. The reaction with other paramagnetic species (3d or 4f metal ions, organic radicals) yielded one-dimensional, two-dimensional, and interlocked networks. The magnetic properties of these systems are reviewed using polarized neutron diffraction and magnetic measurements. It is shown that the spin density maps give a precise description of the ground state of such molecular magnetic species. Moreover, different long-range magnetic orderings (antiferro-, ferri-, and ferromagnetic) have been obtained.