Premium
Preparation and Crystallinity of Molybdenum and Tungsten Sulfides
Author(s) -
Wildervanck J. C.,
Jellinek F.
Publication year - 1964
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19643280514
Subject(s) - molybdenum , molybdenum disulfide , tungsten , crystallization , thermal decomposition , crystallinity , materials science , inorganic chemistry , tungsten disulfide , amorphous solid , chemistry , crystallography , metallurgy , organic chemistry , composite material
The sulfides of molybdenum and tungsten in the composition range MS 3 to MS 2 have been investigated. Molybdenum trisulfide was prepared by a variety of methods; the products were amorphous in all cases. The thermal decomposition of the trisulfide, leading to crystalline molybdenum disulfide, was studied by X‐ray diffraction and a model for the crystallization process is proposed. Molybdenum disulfide prepared by this method or from the elements always was of the hexagonal form. The rhombohedral form of molybdenum disulfide can be prepared from a molten medium; again, a model for the crystallization process is proposed. Quite analogous results were obtained for the tungsten sulfides: Tungsten trisulfide was always found to be amorphous. Tungsten disulfide prepared by thermal decomposition of the trisulfide or from the elements is of the hexagonal form, but a rhombohedral modification of tungsten disulfide could be prepared in the same way as the isotypic molybdenum compound. The unit‐cell dimensions of the disulfides are communicated.