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Accession Number:
AD0265232
Title:
STUDIES OF RARE-EARTH HYDROGEN SYSTEMS
Corporate Author:
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES ENGINEER WATERWAYS EXPERIMENT STATION*
Report Date:
1961-08-01
Abstract:
A gage permitting measuremetresur to 65 atm was built and the hydrides of La, Ce, and Yb were investigated. Equilibrium dissociation pressure-temperature-composition data were b-taind for La- and Ce-H systems. Heats of dissociation were calculated of LaH2.70, LaH2.80, CeH2.80, and CeH2.90. The lattice cnntfor a specimen of CeH2.97 was 5.539 A. Absorption of H at about 20 atm and several hundred degrees by Yb samples yielded YbH2.56, YbH2.2, an YbH.. X-ray diffraction photographs of these hydrides showed the presence of a new face-centered cubic f.c.c. phase. Thermally decomposed and quenched samples of YH2.55 having the compositions YbH2.42 and YbH2.04 also contained an additional f.c.c. phase. Annealing of YbH2.04 effected conversion of this metastable substance to orthorhombic Yb dihydride and to the f.c.c. Measurements were made of the magnetic susceptibility of Yb hydride. IR data for Y hydrids werecompared with CaH2. Isotherms of dissociation pressure vs composition Yb hydrides consisted of 2 parts.
Pages:
0001
Contract Number:
NONR22815
File Size:
0.00MB
