The liquidus curves of the Bi-Cu, Bi-hg, and Bi-Au systems Rere redetermined by a sampling method.The eutectic was determined to be at 270.6 f 0.1" at 0.46 atom % copper (0.14 wt. 70).The Bi-Ag The eutectic was found at 262.5 & 0.2" a t 4.95 rt The Bi-Cu liquidus agrerd fairly well with Kleppa's data over the range investigatedThe Bi-Au liquidus Below the peritectic temperature, a completely new liquidus The peritectic was found at 371 rt 2" by means of differential thermal analysis, the composition The The results curve nas somewhat shifted from the previously determined location. 0.05 atom 70 silver (2.62 wt. 70). by him. did not agree well with the few experimental data available. curve was established.being 23.1 atom yo gold (24.1 at. 70).heats of fusion of the four elements agreed reasonably well with the literature values, except that of bismuth. show that the sampling method is, for many cases, well adapted for the determination of liquidus curves.The eutectic is a t 13.4 =t 0.2 atom %;o gold (14.1 wt. yo) at 241.5 =k 0.5'.

This paper was submitted for publication in the open literature at least 6,months prior to the issuance date of this Microcard. Since the U.S.A.E.C. has no evidence that it has been published, the'paper i s being distributed in Microcard form as a preprint.

The liquidus c u r v e s of thk Bi-Cu, Bi-Ag, and .~i -A U s y s t e m s w e r e . r.e-. .. d e t e r m i n e d by m e a n s of a sampling method. The Bi-Ag c u r v e , w a s s o m e w h a t , .. . ;