SANDIA REPORT SAND2008-3737 Unlimited Release Printed June 2008 In-situ Time-of-Flight Neutron Diffraction of ErD 2 (β phase) Formation during D 2 Loading Mark A. Rodriguez, Clark S. Snow, Ryan R. Wixom, James F. Browning and Anna Llobet Prepared by Sandia National Laboratories Albuquerque, New Mexico 87185 and Livermore, California 94550 Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under Contract DE-AC04-94AL85000.