Activity of hydrogen in metal-hydrogen systems: strontium, thorium-nitrogen, and vanadium alloys

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:6864540

Nelson, S O

The dissolution of H gas has been studied using pressure-composition isotherms in Sr, Th-N and V alloys containing either Nb, Cr or Ti. Direct H equilibrium vapor pressure measurements were performed in the Sr-H and Th-N-H systems at 973 to 1173/sup 0/K and 623 to 1123/sup 0/K, respectively. Isopiestic solubility was used to measure the H equilibrium pressures for the V alloys at 223 to 473/sup 0/K. In all the alloys studied, the reaction of hydrogen with the metal phase was exothermic and hydrogen followed Sieverts' law over a considerable range of hydrogen concentration. The enthalpy of solution of H in the Sr and the enthalpy of formation of ThNH/sub x/ are -14.3 +- 1.2 kcal;/mol H and -16.3 +- 1.5 kcal/mol H/sub 2/, respectively. Enthalpies of solution of H for the V alloys ranged from -8.0 to -10.5 +- 0.3 kcal/mol H. Additions of T to V dramatically enhanced the isopiestic solubility of H, Cr significantly reduced the solubility and Nb moderately increased the solubility. Sieverts' law behavior for H in the V alloys showed that substitutional atoms did not act as deep traps for H.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6864540
• Report Number(s): IS-T-998; ON: DE83004976
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM HYDRIDES
DATA
DISSOLUTION
ELEMENTS
ENTHALPY
EXPERIMENTAL DATA
FORMATION HEAT
HIGH TEMPERATURE
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
LOW TEMPERATURE
MEDIUM TEMPERATURE
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
NUMERICAL DATA
PHASE STUDIES
PHYSICAL PROPERTIES
PNICTIDES
REACTION HEAT
SOLUTION HEAT
STRONTIUM COMPOUNDS
STRONTIUM HYDRIDES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
THORIUM COMPOUNDS
THORIUM HYDRIDES
THORIUM NITRIDES
TITANIUM ALLOYS
TITANIUM COMPOUNDS
TITANIUM HYDRIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM ALLOYS
VANADIUM COMPOUNDS
VANADIUM HYDRIDES