1. Materials Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1, Iwado-kita, Komae, Tokyo 201-8511, Japan
2. Institut de Recherche d’Hydro-Québec (IREQ), 1800 Boul, Lionel-Boulet, Varennes, Québec, Canada J3X 1S1