The silver–calcium phase diagram

Abstract

The silver-calcium system has been reinvestigated over the wholecornposition range by thermal analysis, X-ray diffraction, and metallography. A novel technique has been used to prepare and examine these reactive alloys. In the course of this project four intermetallic compounds have been observed for the first time; ~vliiie two others, viz., Ag,Ca and AgCa, which were reported before by others, have been confirmed. Three of the new co~npounds areTAg,Ca,, Ag,Ca,, and AgCa3, while the fourth was not isolated or examined in detail. Two other compounds which were described in earlier work as Ag,Ca and Ag,Ca, have been found to be Ag,Caz and Ag,Ca,, respectively. Major n~odifications have been made in the liquidus curve and possible reactions in the solid state are indicated.

Thermodynamic description of the Ag–(Ca, Li, Zn) and Ca–(In, Li) binary systems

“…The presence of the compounds Ag 2 Ca and AgCa, which were reported by Baar [27], was confirmed by Alexander et al [28]. Moreover, the compounds described as Ag 4 Ca and Ag 3 Ca [27] were found to be Ag 7 Ca 2 and Ag 9 Ca 2 , respectively [28]. Two definite new compounds Ag 3 Ca 5 and AgCa 3 , and a compound of uncertain stoichiometry containing 59 at% Ca were also added to the Ag-Ca phase diagram by Alexander et al [28].…”

“…Moreover, the compounds described as Ag 4 Ca and Ag 3 Ca [27] were found to be Ag 7 Ca 2 and Ag 9 Ca 2 , respectively [28]. Two definite new compounds Ag 3 Ca 5 and AgCa 3 , and a compound of uncertain stoichiometry containing 59 at% Ca were also added to the Ag-Ca phase diagram by Alexander et al [28]. The temperature of the low calcium eutectic: liquid2fcc(Ag) þAg 9 Ca 2 was reported as 665°C by Alexander et al [28], which is in essential agreement with the result from Baar [27].…”

“…Five compounds for which the stoichiometries approximated to Ag 4 Ca, Ag 3 Ca, Ag 2 Ca, AgCa and AgCa 2 were reported [27]. Alexander et al [28] studied the whole composition range of the Ag-Ca system by thermal analysis, X-ray diffraction, and metallographic analysis techniques. The presence of the compounds Ag 2 Ca and AgCa, which were reported by Baar [27], was confirmed by Alexander et al [28].…”

“…Alexander et al [28] studied the whole composition range of the Ag-Ca system by thermal analysis, X-ray diffraction, and metallographic analysis techniques. The presence of the compounds Ag 2 Ca and AgCa, which were reported by Baar [27], was confirmed by Alexander et al [28]. Moreover, the compounds described as Ag 4 Ca and Ag 3 Ca [27] were found to be Ag 7 Ca 2 and Ag 9 Ca 2 , respectively [28].…”

The lithium–indium system

“…The melting vessel and cooling curve apparfive c o m p o u n~s according to H~~~~~ and atus are described in ref. 9. A port permitted transfer of the melting vessel between a large dry box and the furnace (2) and YatsenkO (3)7 respec-of the cooling curve apparatus without any exposure of tively, a ConspiC~ous difference without any the charge to air.…”