College Park, Maryland      June 6 - 10 , 2004

TP9: Quantitative Texture Analysis of Highly Absorbing Materials from Neutron TOF Data

H. Volz, S. Vogel, J. Roberts, D. Williams, A. Lawson, L. Daemen, T. Medina, M. Geelan (Los Alamos National Laboratory)

The orientation distribution functions (ODF) of rolled foils of dysprosium and erbium metals were determined from neutron time-of-flight (TOF) data using full pattern Rietveld analysis with GSAS. The ODF were fit with spherical harmonics. Both Dy and Er have a hexagonal close-packed (hcp) crystal structure, and are strong absorbers for neutrons with thermal absorption cross-sections of 994 barns for Dy and 159 barns for Er at λ = 1.8 . Various stacks of foils of each material, along with combinations of absorbing and less-absorbing foils, were measured on the neutron powder diffractometer HIPPO at LANSCE. The focus of this work is on the comparison of absorption corrections implemented in the GSAS Rietveld code, and the impact of strong absorption on data analysis. We compare our resulting pole figures from the ODF with those in the literature, and find good agreement.

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