RARE EARTH COMPOUNDS. II. THE SERIES YBLn2S4
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA
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When ytterbium sesquisulfide is heated under vacuum to a sufficiently high temperature, sulfur and a small amount of ytterbium is lost through volatilization and an ytterbiumdeficient monosulfide phase is formed. Magnetic susceptibility measurements indicate that the ytterbium is converted from a trivalent to a divalent species in the process, the amount of trivalent character remaining being dependent upon the deviation from the ideal stoichiometry of YbS3. In view of the reducibility demonstrated by ytterbium sesquisulfide, we thought it might be possible to heat, under vacuum, mixtures of trivalent ytterbium with other rare earth metal sulfides to obtain double sulfides with the ytterbium present in the divalent state. By this procedure we have prepared for the first time and subsequently identified the X-ray powder diffraction spectra of a series of compounds with the nominal stoichiometry YbIILn2S4 for Ln La, Pr, Y, Ho, Er, and Tm. The known, analogous compound YbIIYbIII2S4 was also prepared.
- Inorganic Chemistry