The workshop proved to be a highly successful forum for the exchange of ideas and discussion of the latest developments. The liveliest discussions concerned the smallest samples that people had successfully used and the features available in various refinement packages. Von Dreele).Īt the end of the day, the floor was opened to discussion on future directions. The SRM is certified with respect to the lattice parameter of the Si substrate. Neutron diffraction is particulary well suited for the study of deformation mechanisms in engineering materials. It consists of 25 mm x 25 mm pieces of a silicon wafer with a Si-Ge epilayer. Our data confirm magnetic ordering below T-c 1.9 K. David) recent additions to the powder analysis components of GSAS, and the virtual reality modelling output now available from the PC version (R. The new SRM 2000 is the first thin-film, high-resolution diffraction SRM. We present a neutron powder diffraction study on TmCuAl, crystallizing in the ZrNiAl-type hexagonal structure. After an introduction to the subject, the main. In this paper some recent improvements in the analysis of magnetic neutron powder diffraction data are discussed. Kumazawa) analysis of time-of-flight data using the Cambridge Crystallographic Subroutine Library (W. In spite of intrinsic limitations, neutron powder diffraction is, and will still be in the future, the primary and most straightforward technique for magnetic structure determination. Izumi) the merits of maximum entropy methods (S. Topics included: development of RIETAN-96T (F. Ibberson).ĭata refinement and handling formed the second component of the workshop. For nuclear peaks, the diffracted peak intensity is proportional to the square of the amplitude of structure factor, i.e. Swainson) and time-of-flight instrumentation (T. The neutron powder diffraction patterns contains both nuclear Bragg peaks and magnetic Bragg peaks. Keller) overview of the C2 DUALSPEC diffractometer and program at Chalk River, Canada (I. Goncharenko), developments at the new Swiss national source (L. Popovici) the use of focusing monochromators to push the limits of sample size (I. Radaelli) differing approaches to focusing monochromator design (T. Topics covered included: an overview of the D2B multi-Soller powder diffractometer at the ILL (P. It was shown that, while powder diffractometers are getting more expensive, they are capable of impressive improvements in resolution and intensity that will allow applications of neutron powder diffraction to new areas of science and technology. The morning sessions concerned instrumentation, and focused on resolution, large multidetectors and design of new focusing monochromators. 10.3.3 Applications to neutron powder diffraction There are a number of applications in which the degree and propensity to SRO has a profound effect on the. Neutron diffraction complements X-ray diffraction for the determination of the atomic and/or magnetic structure of a material or for the in situ studies of changes in structure or phases as a function of temperature, pressure, and/or environment. A Workshop on Advanced Neutron Powder Diffraction Instrumentation and Data Analysis Techniques was held Aug.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |