A FUNDAMENTAL INVESTIGATION OF THE ALLOYING BEHAVIOR OF THE RARE EARTHS AND RELATED METALS
Abstract
The vapor pressures of praseodymium, neodymium, and samarium were measured with a Knudsen effusion apparatus. Also, using the same apparatus, thermodynamic activities of the liquid phase of the praseodymium-neodymium system were deter mined. Heats of vaporization were established from the vapor pressure data for praseodymium, neodymium, and samarium. The phase diagram for the praseodymium-neodymium system was determined from thermal analyses, metallographic examina tions, and X-ray diffraction studies. Results of the thermodynamic activity studies and measurements of solid (room-temperature) and liquid densities indicate ideal behavior in both liquid and solid solutions, within the experimental error. Ideal behavior was predicted for the praseodymium-neodymium system, as there are essentially no differences between the component elements in considering such variables as electronic structure, crystal structure, atomic diameter, valency effect, electronegativity, and electron concentration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1963
- Accession Number
- AD0402619
Entities
People
- A. S. Yamamoto
- C. E. Lundin
- J. F. Nachman
Organizations
- Denver Research Institute