A brief investigation of the fithiumaodium liquid metal a p t e m waa made wing thermal a d * plua chemical d y k of the immiscible phases q l e d a t temperature. Addition of 3 . 8 atomic % eodimn to Lithium lowem its freeeing point from 179.4 to 171". At 171" d u m and lithium form two immiacible liquid phasem of compodion 3 . 8 and 86.9 atomic % sodmm. The estima-a +tical bmper+e-a+ eompoBition are 380" apd 35 atomic % d u m , respectively. The composition at the eutectic pomt is 3 . 7 atom % hthum and the temperature IS 93.4".A brief investigation of the binary system sod i m l i t h i u m was made as a part of the program on liquid metals. The system had been investigated p r e~i~~~l y~-' but no measurements were made of the mutual solubility of the two molten phases.The system was studied using t h d and chemical analysis, the melting point of lithium and the temperature at which a solid lithium phase is in equilibrium with two liquid phases being determined thermally and the composition of the immiscible liquid phases being determined chemid y . The limits of the miscibility gap were estimated from the data by use of the equations relating the activity to the mole volume and the solubility parametem.' MateMs.-Reagent grade brit& sodium from the du Pont Companywasused. uriticswerepotamium25Op.p.m.. chlorine 30 p.p.m., and phosphorm 20 p.p.m. Lithium waa obtained from the Maywood Chemical Com-(7) Ref. 5, p. 322. (8) "The Heat Capacity of Lithium froiii 25 to 900°,"
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