Abstract
The standard enthalpies of formation at 300 K of the RPdAl phases (R = Nd, Sm, Gd, Tb, Dy, Ho and Er) have been obtained by using a high-temperature direct reaction drop calorimeter. The reliability of the calorimetric results has been determined and supported by using different analytical techniques: light optical microscopy, scanning electron microscopy equipped with electron probe microanalysis (EPMA with EDS detector) and X-ray Powder Diffraction analysis. The high exothermal values observed for the RPdAl phases are discussed and compared with those available for the binary compounds of the R–Pd systems and for the ternary RNiAl phases.
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