Stable crystalline lithium nitride and process for its preparation
AssigneeMax-Planck-Gesellschaft zur Forderung der Wissenschaften e.V.
InventorsAlbrecht Rabenau, Ulrich von Alpen, Erich Schonherr, Gertraude Muller
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Abstract
Crystalline lithium nitride, stable in air, characterized by a sodium content of less than 5.times.10.sup.-2 weight-percent, a potassium content of less than 10.sup.-2 weight-percent, a magnesium content of less than 1.times.10.sup.-2 weight-percent, and a silicon and iron content of 10.sup.-2 to 10.sup.-3 weight-percent each; is obtained by heating lithium having a purity of at least 99.9% in a vessel made of tungsten, niobium, ruthenium or tantalum in a nitrogen atmosphere at a pressure of at least 250 mm Hg in the absence of oxygen and water at a temperature of from 300.degree. C. to the melting point of lithium nitride.
Claims5
Crystalline lithium nitride, stable in air, having the following characteristics:
- sodium content of less than 5.times.10.sup.-2 wt%
- potassium content of less than 10.sup.-2 wt%
- magnesium content of less than 1.times.10.sup.-2 wt%
- silicon and iron content of 10.sup.-2 to 10.sup.-3 wt%
- in the form of hexagonal crystals having a layered structure containing Li.sub.2 N layers with interposed lithium ions.
Dependencies are inferred from the claim text.