Metal ternary sulfides
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJosephine Covino, Marian E. Hills
Life of this patent
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Abstract
Metal ternary sulfides of the general formula MM'.sub.2 S.sub.4 are synthesized by introducing stoichiometric amounts of nitrate precursors in concentrated nitric acid and heating to approximate dryness to yield a homogeneous powder mixture. The mixture is then exposed to a gaseous H.sub.2 S atmosphere under controlled conditions to produce the desired sulfide.
Claims6
A method for producing a metal ternary sulfide represented by the general formula MM'.sub.2 S.sub.4, in which stoichiometric amount of nitrate compound precursors selected from the nitrates of M and M' are introduced in a concentrated nitric acid solvent to obtain a mixture of nitrates in said nitric acid solvent, comprising the following steps:
- heating said solvent containing said mixture to about dryness thereby obtaining a desiccated, homogeneous mixture of nitrates,
- grinding said desiccated, homogeneous mixture to form a fine powder, partially redissolving said powder in a concentrated nitric acid solvent,
- again heating said solvent containing said nitrate mixture to about dryness obtaining a desiccated, homogeneous mixture;
- and
- heating said desiccated, homogeneous mixture under the flow of a gaseous chalcogenide atmosphere to yield said metal ternary sulfide.
Dependencies are inferred from the claim text.