Accession Number:

AD0402619

Title:

A FUNDAMENTAL INVESTIGATION OF THE ALLOYING BEHAVIOR OF THE RARE EARTHS AND RELATED METALS

Descriptive Note:

Final technical rept. for 1 Nov 1959-31 Oct 1962

Corporate Author:

DENVER RESEARCH INST CO

Report Date:

1963-01-01

Pagination or Media Count:

80.0

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.

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE