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Rare earth-activated aluminum nitride powders and method of making

  • US 7,935,325 B2
  • Filed: 12/20/2006
  • Issued: 05/03/2011
  • Est. Priority Date: 01/31/2006
  • Status: Expired due to Fees
First Claim
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1. A method of making a rare earth-activated aluminum nitride, comprising:

  • (a) forming an aqueous mixture containing aluminum and a rare earth metal;

    (b) precipitating a mixed hydroxide of aluminum and the rare earth metal;

    (c) reacting the mixed hydroxide with ammonium fluoride to form a fluoride compound of aluminum and the rare earth metal;

    (d) drying the fluoride compound; and

    (e) reacting the dried fluoride compound with ammonia gas to form the rare earth-activated aluminum nitride.

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