Rare earth graphite intercalation compounds

✍ Scribed by W.E. Craven; W. Ostertag

• Publisher: Elsevier Science
• Year: 1966
• Tongue: English
• Weight: 414 KB
• Volume: 4
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(66)90084-4

✦ Synopsis

A group of new &k-graphite compounds, where Me represents the elements Gd, Tb, Dy, Ho, Er, Tm and Yb was prepared. The compounds were formed by reacting graphite with a metallic solution of rare earth elements in liquid ammonia. Except for ytterbium which dissolves directly in liquid ammonia, all other rare earths had to be dissolved by electrolytic techniques using a Pt-cathode, a rare earth anode and NH41 as an electrolyte. The intercalation compounds were analyzed for Me, C, N, H and I. Magnetic susceptibility measurements were carried out at several temperatures between 80°K and 290°K. The measurements indicate that in Gd-, Tb-, Dy-, Ho-, Er-and Tm-graphite the rare earths are present in the trivalent state. In ytterbium graphite, ytterbium has an effective valency betvveen two and three. X-ray data will be discussed.