Praseodymium impurity systems

The phase diagram for the praseodymium-neodymium system has been investigated by Markova et al. (1963) and by Lundin et al. (1964 ). Markova et al. used 97 (wt )% pure praseodymium and 98% pure neodymium. The impurities present in their metals consisted of other rare earth metals, plus Cu, Fe and Ca in unspecified amounts. Their methods of investigation included thermal analysis, metallography. X-ray diffraction and hardness measurements. Their alloys were annealed at 600°C for 20 hr before measurements were made. Terekhova (1963) has published a similar phase diagram that would appear to be based on the same research. Both Russian diagrams show complete solid solubility for both the dhep and the bcc structures and a definite two-phase region (liquid plus solid) between the liquidus and solidus lines. 

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