1. Department of Mechanical Engineering, Private Bag 4800, University of Canterbury; Christchurch New Zealand
2. Department of Chemistry, University of Canterbury; Christchurch New Zealand
3. Science et Ing.nierie des Mat.riaux et des Proc.d.s, Grenoble INP-CNRS-UJF; Saint Martin D.H.res France
4. National Isotope Center, GNS Science; Lower Hutt New Zealand