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A new approach for the determination of the elastic macro strain and stress in textured polycrystals by expanding the texture-weighted strain tensor in a series of generalized spherical harmonics is presented. The model ground state is defined by the strain/stress state in an isotropic sample in the Voigt model.
research papers
A neutron diffraction study of the nuclear and magnetic structure of goethite (
-FeOOH) with varying crystallinity and temperature is presented. The antiferromagnetic structure in the Pb′nm color space group suggests spins aligned parallel to the c axis. A significant reduction in the Néel temperature was found for a nanocrystalline sample.
-FeOOH) with varying crystallinity and temperature is presented. The antiferromagnetic structure in the Pb′nm color space group suggests spins aligned parallel to the c axis. A significant reduction in the Néel temperature was found for a nanocrystalline sample. research papers
The quasi Monte Carlo method and barycentric interpolation are used to calculate inverse pole figures from neutron diffraction data recorded under in situ mechanical testing or annealing. The described numerical procedure refers to time-of-flight engineering diffractometers and is exemplified on face-centered cubic lattice symmetry, but is not limited to this case.
laboratory notes
A new six-axis robotic sample changer for neutron powder diffraction experiments, including texture measurements, has enabled a novel set of experiments to be performed at the High-Pressure Preferred Orientation diffractometer at the Lujan Neutron Scattering Center.
