Accession Number : AD0453118


Title :   RARE EARTH COMPOUNDS. II. THE SERIES YBLn2S4


Corporate Author : LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA


Personal Author(s) : Ring, S A ; Tecotzky, Melvin


Report Date : 03 Jun 1964


Pagination or Media Count : 5


Abstract : 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 Yb(II)Ln2S4 for Ln = La, Pr, Y, Ho, Er, and Tm. The known, analogous compound Yb(II)Yb(III)2S4 was also prepared.


Descriptors :   *YTTERBIUM COMPOUNDS , REPRINTS , CRYSTAL STRUCTURE , COMPLEX COMPOUNDS , HIGH TEMPERATURE , SYNTHESIS(CHEMISTRY) , X RAY DIFFRACTION , LOW PRESSURE , VALENCE , RARE EARTH COMPOUNDS , YTTRIUM COMPOUNDS , SULFIDES , LANTHANUM COMPOUNDS , ERBIUM COMPOUNDS , PRASEODYMIUM COMPOUNDS , THULIUM COMPOUNDS


Subject Categories : Inorganic Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE