Reference

Preparation of cerium monosulfide

Preparation of cerium monosulfide. Seta, Hirokuni; Katoh, Minoru; Yoshimura, Kiyoshi (Nihon Univ., Tokyo, Japan). Nippon Daigaku Bunrigakubu Shizenkagaku Kenkyusho Kenkyu Kiyo, 11, 13-18 (Japanese) 1976. CODEN: NDBSAL. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) CeS was prepd. from mixts.Several reagents with their cas registry numbers 12014-93-6 and 1306-38-3 are used here. of Ce2S3, CeO2 and C in a high vacuum app. at elevated temp. Ce2S3 was prepd. from CeO2 and a current of H2S and H2 in a porcelain tube at high temp. The net reaction is (3-a)Ce2S3 + CeO2 + 2C .fwdarw. (7-2a)CeS + 2CO + (2-a)S, where a varies with temp., powder size and the mixing condition. .

Infrared absorption and features of the conduction of rare earth metal sulfides of variable composition

Infrared absorption and features of the conduction of rare earth metal sulfides of variable composition. Marchenko, V. I.; Serdyuk, V. A. (USSR). Zh. Prikl. Spektrosk., 26(2), 361 (Russian) 1977. CODEN: ZPSBAX. DOCUMENT TYPE: Journal CA Section: 73 (Spectra by Absorption, Emission, Reflection, or Magnetic Resonance, and Other Optical Properties) Section cross-reference(s): 76 The absorption IR spectra of La, Ce, and Pr sulfides of a variable compn. were analyzed. For the monosulfides, the metal component of the bond increased from LaS to CdS owing to the 4f .fwdarw. 12038-06-1 and 12014-93-6 are cas registry numbers of chemicals which are used as reagents here. 5d electronic transitions. For the intermediate compds. in the homogeneity region M2S3-M3S4, the metal character of the properties increased with increasing the metal atom no. in the cationic sublattice. By decreasisng the S/M ratio, the portion of the M-S ionic bonds increased and, correspondingly, the portion nof the S-S and M-M covalent bonds decreased. The M2S3 compds. had a mixed ionic-covalent bond. By the substitution of La atoms in Th3P4-type crystals with Ce or Pr atoms, the lattice priod decreased and the ionic character increased. .