(1) H.F.Bittner and C.C.Badcock:J. Electrochem. Soc.,1983, 130, 193C. (2) J.J.G.Willems and K.H.J.Buschow: J. Less CommonMet., 1987, 129, 13. (3) T.Sakai, T.Hazama, H.Miyamura, N .Kuriyama,A.Kato and H.Ishikawa: J. Less-Common Met..1991, 172-174, 1175. (4) T.Sakai, A.Takagi, K.Kinoshita, N.Kuriyama.H .Miyamura and H. Ishikawa: J. Less-Common Met..1991. 172-174, 1185. (5) Mingming GENG: J. of Chin. Rare Earth Soc., 1994,12(1), 1. (in Chinese) (6) F.Meli:private communication (7) T.Sakai, H.Miyamura, N.Kuriyama, I.Uehama,M.Muta, A.Takagi, U.Kajiyama, K.Kinoshita and F.Isogai: J. Alloys and Compounds, 1993, 192, 158. |