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US4234554A
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Stable crystalline lithium nitride and process for its preparation
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
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Filing: 1978-07-28
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Granted: 1980-11-18
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Expires: 1998-07-28
Abstract
Abstract Crystalline lithium nitride, stable in air, characterized by a sodium content of less than 5×10 -2 weight-percent, a potassium content of less than 10 -2 weight-percent, a magnesium content of less than 1×10 -2 weight-percent, and a silicon and iron content of 10 -2 to 10 -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° C. to the melting point of lithium nitride.
Inventors
- 👤 Albrecht Rabenau
- 👤 Ulrich von Alpen
- 👤 Erich Schonherr
- 👤 Gertraude Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:39
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/0607; C01B21/061; H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; C01P; C01P2002/00; C01P2002/70; C01P2002/78; C01P2006/00; C01P2006/80; Y; Y10; Y10S; Y10S117/00; Y10S117/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
Crystalline lithium nitride, stable in air, having the following characteristics: sodium content of less than 5×10 -2 wt% potassium content of less than 10 -2 wt% magnesium content of less than 1×10 -2 wt% silicon and iron content of 10 -2 to 10 -3 wt% in the form of hexagonal crystals having a layered structure containing Li 2 N layers with interposed lithium ions.
Claim 2
Dependent Claim
64 words
Crystalline lithium nitride, stable in air, having the following characteristics: sodium content of less than 5×10 -2 wt% potassium content of less than 10 -2 wt% magnesium content of less than 1×10 -2 wt% silicon and iron content of 10 -2 to 10 -3 wt% in the form of hexagonal crystals having a layered structure containing Li 2 N layers with interposed lithium ions.
Claim 3
Dependent Claim
44 words
Crystalline lithium nitride as claimed in claim 1, wherein the lithium nitride has a high lithium conductivity of the order of δ=10 -3 Ω -1 per cm-1 having an activation energy of 0.25 eV, in a direction parallel with the Li 2 N planes.
Claim 4
Dependent Claim
63 words
Crystalline lithium nitride as claimed in claim 1, obtained by heating of lithium of a purity of at least 99.9%, at a temperature between 300° C. and the melting point of lithium nitride, in a vessel of tungsten, niobium, ruthenium or tantalum in a nitrogen atmosphere at a pressure of at least 250 mm Hg and in the absence of oxygen and water.
Claim 5
Dependent Claim
58 words
Process for preparing lithium nitride as claimed in claim 1, which process comprises heating at least 99.9% pure lithium metal at a temperature from 140° to 180° C. in a tungsten vessel at a nitrogen pressure of at least 250 mm Hg and then raising the temperature to 400°-600° C. to the melting point of Li 3 N.
Claim 6
Dependent Claim
49 words
Process for preparing lithium nitride as claimed in claim 1, which process comprises heating at least 99.9% pure lithium metal at a temperature from 140° to 180° C. in a tungsten vessel at a nitrogen pressure of greater than 250 mm Hg and at a temperature above 300° C.
References Cited (Backward Citations)
US2910347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |