Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Rare earth metal
Patent
1991-06-24
1994-03-08
Brunsman, David
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Rare earth metal
423324, 501 97, C04B 3558
Patent
active
052924890
ABSTRACT:
This invention provides a compound having the formula LnSi.sub.3 N.sub.5 wherein Ln is selected from the group consisting of scandium, yttrium, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. In addition, there is provided a method for making the compound Ln'Si.sub.3 N.sub.5 wherein Ln' is a radical selected from the group consisting of lanthanum, scandium, yttrium, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, comprising the step of reacting SiO.sub.z, Ln'.sub.x O.sub.y in a nitrogen atmosphere in the presence of carbon at a temperature of from 1200.degree. C. to about 2000.degree. C. for at least 2 hrs., x being an integer equal to or greater than 2, y being an integer equal to or greater than 3, and z being an integer selected from 1 and 2, with the proviso that x and y are selected to result in a stable compound of Ln'.sub.x O.sub.y.
REFERENCES:
Inoue et al., "A crystallographic study of a new compound of lanthanum silicon nitride, LaSi.sub.3 N.sub.5 ", J. Mat. Sci., 15, pp. 2915-2920, (1980), Chapman & Hall Ltd. (no month avail.).
Z. Inoue, "A new role for nitrogen in silicon nitride and related ceramics", J. Mat. Sci. Letters, 4, pp. 656-658, (1985), Chapman & Hall Ltd. (no month avail.).
Holcombe et al., "Advanced Ceramic Materials for Hydrogen-Fluorine Environments" Am. Cer. Soc. Bull., 60, pp. 546-548 (1981) (no month avail.).
Wills et al., "The silicon lanthanide oxynitrides", J. Mat. Sci., 11, pp. 749-759, (1979) (no month avail.).
Fanelli Anthony J.
Solar Jeffrey P.
Wu Beili L.
Yamanis Jean
Allied-Signal Inc.
Brunsman David
Buff Ernest D.
Fuchs Gerhard H,.
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