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 Title: |
US6096282:
Instantaneous synthesis of refractory nitrides from solid precursors
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Kaner, Richard B.; Santa Monica, CA
Wallace, Charles H.; Corte Madera, CA
Reynolds, Thomas K.; Riverside, CA
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| Assignee: |
The Regents of the University of California, Oakland, CA
other patents from UNIVERSITY OF CALIFORNIA, THE REGENTS OF (599425) (approx. 4,840)
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| Published / Filed: |
2000-08-01
/ 1998-04-23
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| Application Number: |
US1998000066722
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| IPC Code: |
Advanced:
C01B 21/06;
Core:
C01B 21/00;
IPC-7:
C01B 21/06;
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| ECLA Code: |
C01B21/06; C01B21/06F4; C01B21/06F2; C01B21/06K;
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| U.S. Class: |
Current:
423/409;
Original:
423/409;
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| Field of Search: |
423/409,411,412
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| Government Interest: |
The high pressure procedure described below was made in part with support from the National Science Foundation Grant Number DMR 9315914 and the ambient pressure procedure using NH4 Cl was made in part with support from the National Science Foundation Grant Number DMR 9704964.
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| Priority Number: |
| 1998-04-23 |
US1998000066722 |
| 1997-09-09 |
WO1997US0015859 |
| 1996-09-10 |
US1996000025187P |
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| Abstract: |
A process for forming high quality crystalline refractory materials, particularly gallium (III) nitride (GaN), from solid precursors. By blending dry reactants, including NH4 Cl, in an oxygen and moisture free environment, placing the reactants in a reaction vessel and in an inert environment, rapidly exposing the reactants to a temperature in excess of about 225° C. The soluble salt by-products are then extracted from the resultant mixture, leaving high purity crystals of the nitride in the form of a fine powder.
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| Attorney, Agent or Firm: |
Koppel & Jacobs ;
Ram, Michael J. ;
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| Primary / Asst. Examiners: |
Langel, Wayne;
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| INPADOC Legal Status: |
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| Parent Case: |
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of PCT Application No. PCT/US97/15859 filed Sep. 9, 1997 identifying the United States as an elected country, said PCT application claiming priority based on provisional U.S. patent application Ser. No. 60/025,187, filed Sep. 10, 1996.
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| Designated Country: |
CA CN EP JP US
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| Family: |
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First Claim:
Show all 14 claims |
What is claimed is:
1. A method of preparing a metal nitride comprising:
- a) mixing stoichiometric quantities of a powdered metal halide with a powdered alkali metal nitride to form a substantially uniform blend, said mixing being done in an inert atmosphere,
- b) adding a predetermined amount of a powdered ammonium halide to the uniform blend to form a reaction mixture while maintaining the inert atmosphere,
- c) placing the reaction mixture in a reaction vessel without exposing the reaction mixture to a reactive amount of oxygen,
- d) rapidly heating the reaction mixture to an elevated temperature, said heating causing a chemical reaction to occur and the desired inorganic nitride to be formed, the temperature of the reaction not exceeding about 800° C.; and
- d) separating the desired inorganic nitride from other compounds formed in the reaction, recovering a pure crystalline nitride.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
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