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This paper is a study of the phase equilibria of the Sn-3.8Ag-0.7Cu alloy investigated by a differential cooling method. The difficulty in assessing phase equilibria of the Sn-Ag-Cu (SAC) system because of the insufficient resolution of conventional characterization techniques is solved by inducing preferential growth of a solid phase in a melt by holding the alloy at the solid-liquid phaseequilibrium field. Application of the technique to Sn-3.8Ag-0.7Cu with varying holding temperatures yielded results that the alloy is slightly off eutectic composition. The phase-formation sequence of the alloy during solidification was found to be Ag 3 Sn, β-Sn, and finally the ternary eutectic microstructure.

The possibility that the electron tunnels to the benzyl chloride is Pelino, Viswanadham, and Edwards discounted in this case because the proximity of the cation should stabilize the electron in its trap. (48) H.

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