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AssigneeExxon Research & Engineering Co.
InventorsMartin B. Dines, Russell R. Chianelli
Estimating the term…
Dichalcogenides of Group IVb, Vb, molybdenum and tungsten of two new forms have been discovered. The two new forms are the amorphous and layered-sheet configurations. In particular, the dichalcogenides of Group IVb, Ib, molybdenum and tungsten, i.e. Z(MX.sub.2).sub.n wherein M is the metal and X is the chalcogen, n is at least about 20,000 and Z is the number of such (MX.sub.2).sub.n sheets ranging from 1-10, can be described as possessing a "rag-like" structure representing a system consisting of single or several stacked but randomly folded and disordered layers or sheets having dimensions (as determined by TEM) corresponding to about 6.2 to 62 A in thickness, about 500 A minimum length by about 500 A minimum width. Broadly the rag-like (MX.sub.2).sub.n can be likened to a stack of polymer sheets wherein each sheet is one atom thick. These sheets of (MX.sub.2).sub.n are prepared by the controlled heating (in a flowing stream of H.sub.2 /H.sub.2 S) of amorphous MX.sub.2 obtained by the monaqueous low temperature precipitation of MX.sub.2 from mixtures of the metal salt and sources of sulfur, selenium or tellurium.
A composition of the formula MX.sub.2 which is amorphous to X-rays, wherein M is a metal selected from the group consisting of Group IVb, Group Vb, molybdenum and tungsten transition metals and X is a chalcogen selected from the group consisting of sulfur, selenium and tellurium.
A composition of the formula Z(MX.sub.2).sub.n wherein M is a metal selected from the group consisting of Group IVb, Vb, molybdenum and tungsten, X is a chalcogen selected from the group consisting of sulfur, selenium and tellurium and n is at least 20,000, the formula (MX.sub.2).sub.n representing a single sheet of the material (MX.sub.2) and Z is the number of such sheets from 1 to 10 existing in a stack, wherein the sheet or stack of sheets have the dimensions of about 6.2 to 62 A in thickness, at least about 500 A in length and at least about 500 A in width.
Homogeneous dispersions of metal chalcogenides of the formula MX.sub.2 wherein M is a transition metal selected from the group consisting of Group IVb, Vb, molybdenum and tungsten transition metals and X is a chalcogen selected fromthe group consisting of sulfur, selenium, and tellurium prepared by mixing in the presence of a non-aqueous, aprotic polar organic solvent at at temperature of between -78.degree. to 400.degree. C.:
An electric current-producing cell, comprising:
Dependencies are inferred from the claim text.