RESULTS OF AN X-RAY STUDY OF CERIUM AND LANTHANUM HYDRIDES

Journal Article · Wed Aug 21 04:00:00 EDT 1963 · Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals

OSTI ID:4691625

Vainshtein, E E; Bril', M N; Staryi, I B; Kost, M E

Trihydrides of Ce and La were prepared by direct reaction of hydrogen with the metal at room temperature. Three lanthanum hydrides LaH/sub 2.66/, LaH/ sub 2.26/, and LaH/sub 1.97/, and four cerium hydrides CeH/sub 2.97/, CeH/sub 2.59/, CeH/sub 2.24/, and CeH/sub 2/ were prepared by heating the trihydride in vacuum and pumping off the hydrogen gas. These lower hydrides were stable in vacuum ( approximates 10/sup -3/ mm Hg std) at room temperature. The hydrides were hot pressed between sheets of plastic, and stored in vacuum or dry CO/sub 2/ to avoid reaction with oxygen or water vapor in the air. The LIII x-ray absorption spectra were taken on a focusing vacuum spectrograph with a second- order reflection from the (1011) plane of a bent quartz crystal. The resolution of the instrument was 7500. Ce and La hydrides did not show any fine structure. The cerium and lanthanum were trivalent in these hydrides. No change in structure and in position of the L-spectra can be observed on going from the dihydride to the trihydride. Hence, there is no change in valence state of the rare earth metal in these compounds. The compound becomes more ionic on going from the dihydride to the trihydride with a decrease in electrical conductivity. (TTT)

• Research Organization: Inst. of Inorganic Chemistry, Academy of Sciences, Siberian SSR; Kurnakov Inst. of Inorganic Chemistry, Academy of Sciences, USSR; Ushinskii Teachers Inst., Odessa
• NSA Number: NSA-17-040795
• OSTI ID: 4691625
• Journal Information: Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals, Journal Name: Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals Vol. Vol: 151; ISSN DANKA
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ABSORPTION
AIR
CARBON DIOXIDE
CERIUM
CERIUM HYDRIDES
CHEMICAL REACTIONS
CHEMISTRY
CORROSION PROTECTION
CRYSTALS
ELECTRIC CONDUCTIVITY
GASES
HEATING
HYDROGEN
HYPERFINE STRUCTURE
INSTRUMENTS
LABORATORY EQUIPMENT
LANTHANUM
LANTHANUM HYDRIDES
OXIDATION
OXYGEN
PHOTOGRAPHY
POLYMERS
PREPARATION
PUMPS
QUARTZ
REFLECTION
RESOLUTION
SHEETS
SPECTRA
SPECTROSCOPY
STABILITY
STORAGE
VACUUM
VALENCE
VAPORS
WATER
X RADIATION