1. Materials Science Centre, School of Materials, University of Manchester, Grosvenor Street, Manchester M1 7HS, United Kingdom, European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France, CCLRC Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom, and Textiles and Paper, School of Materials, University of Manchester, Sackville Street, Manchester, M60 4QD, United Kingdom