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Author Naruke, Haruo ♦ Wakatsuki, Noboru ♦ Hoshi, Yoshihiro ♦ Sasaki, Yoshinori
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ SOLAR ENERGY ♦ MOLYBDENUM SELENIDES ♦ SYNTHESIS ♦ CRYSTAL STRUCTURE ♦ ELECTRIC CONDUCTIVITY ♦ PHOTOELECTROCHEMICAL CELLS ♦ MATERIALS ♦ SAMPLE PREPARATION ♦ POWDERS ♦ HEAT TREATMENTS ♦ SCANNING ELECTRON MICROSCOPY ♦ X-RAY DIFFRACTION ♦ STOICHIOMETRY ♦ CHEMICAL ANALYSIS ♦ DENSITY ♦ HEXAGONAL LATTICES
Abstract Molybdenum diselenides were synthesized at 1273 K for 24 h. The X-ray diffraction (XRD) analysis showed the compound to be non-stoichiometric in the approximate range of 1.85 {le} Se/Mo {le} 2.0. Density measurements suggested a co-existence of interstitial Mo and Se vacancies in the lattice over the non-stoichiometric range. Well-grown crystals of hexagonal 2Hb-type were formed in the range of 1.9 {le} Se/Mo {le} 2.09, whereas fine powders were given for Se/Mo < 1.9. In the latter range, a mixed-stacking of 2Hb- and 3R-type layers was suggested to take place, and the ratio of 2Hb:3R in the compounds of Se/Mo = 1.85 was estimated to be about 85:15 by means of a simulation of the XRD patterns. Compressed samples of 1.85 {le} Se/Mo < 1.9 were higher in the electrical conductivity and were smaller in its temperature dependence, compared with those of 1.9 {le} Se/Mo {le} 2.0.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 31
Issue Number 6


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