|Author||Warf, J. C. ♦ Hardcastle, K.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||CHEMISTRY ♦ ATMOSPHERE ♦ BEHAVIOR ♦ DIFFRACTION ♦ EUROPIUM HYDRIDES ♦ HEATING ♦ HYDROGEN ♦ LATTICES ♦ METALS ♦ PREPARATION ♦ PRESSURE ♦ VACUUM ♦ X RADIATION ♦ YTTERBIUM HYDRIDES|
|Abstract||The preparation of ytterbium and europium hydrides and the properties of each are discussed. It is shown that YbH/sub 2//sub .//sub 5//sub 5/ may be produced by subjecting 99.8% ytterbium metal in an atomic hydrogen welded, double- walled bomb to heat and pressure. The metal is first heated in vacuo and then allowed to absorb hydrogen at atmospheric pressure until the composition is YbH/ sup 1//sup .//sup 9//sup 0/. The hydrogen pressure in the apparatus is increased to several atmospheres. At a composition of YbH/sub 2//sub .//sub 4/ the dissociation pressure is 20.9 atm at 312 deg C. Examination by powder x-ray- diffraction techniques shows the presence of a fcc phase along with a small amount of the orthorhombic dihydride. The lattice constants are 5.192 plus or minus 0.002A. The same test was applied to europium but a hydride as high as that in ytterbium was not obtained. The orthorhombic Eu/sub 1//sub .//sub 8//sub -//sub 1//sub .//sub 9/a i s formed. (N.W.R.)|
|Learning Resource Type||Article|
|Publisher Department||Univ. of Southern California, Los Angeles|
|Journal||Journal of the American Chemical Society|
|Organization||Univ. of Southern California, Los Angeles|
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