Reinvestigation of the Cd-Gd phase diagram.

The complete Cd-Gd equilibrium phase diagram was investigated by a combination of powder-XRD, SEM and DTA. All previously reported phases, i.e., CdGd, CdGd, CdGd, CdGd, CdGd, and CdGd, could be confirmed. In addition, a new intermetallic compound with a stoichiometric composition corresponding to "CdGd" was found to exist. It was obtained that "CdGd" decomposes peritectically at 465 °C. Homogeneity ranges of all intermetallic compounds were determined at distinct temperatures. In addition, the maximum solubilities of Cd in the low- and high-temperature modifications of Gd were determined precisely as 4.6 and 22.6 at.%, respectively. All invariant reaction temperatures (with the exception of the formation of CdGd) as well as liquidus temperatures were determined, most probably, CdGd is formed in a peritectoid reaction from CdGd and CdGd at a temperature below 700 °C.