The In-Pd-Sn phase diagram (xPd≤0.6): Isothermal sections

The ternary In-Pd-Sn phase diagram was investigated in the composition range up to approximately 60 at.% Pd which includes the phase relations most relevant for lead-free soldering. The investigation included X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The ternary equilibrium phase relations were studied for three isothermal sections at 200, 500, and 700 °C, respectively, and the ternary solubilities of several binary compounds were determined for 500 and 700 °C using quantitative SEM. No ternary compound was found to exist in the investigated part of the system, but some of the binary phases show a considerable solid solubility in the ternary system, including most probably a continuous solid solution between αInPd2 and Pd2Sn.