Silicophosphate compounds and method of making same

Details Silicophosphate compounds and method of making same Silicophosphate compounds and method of making same

1997-10-17

1999-07-13

Bos, Steven

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423263, 502208, 502209, 502210, 502213, 502214, C01B 1300, C01B 2500, C01B 3300, C01F 1700

Patent

active

059222972

ABSTRACT:
A compound having the general formula AM.sub.1+y.sup.3+ M.sub.2-2y.sup.4+ M.sub.y.sup.5+ Si.sub.2 P.sub.6 O.sub.25, wherein A can be K, Rb, or Cs, M.sup.3+ can be Al, Ga, Cr, Fe, Sc, In, Y, lanthanide series elements, or combinations of these, M.sup.4+ can be Si, Ge, Ti, Ir, Ru, Sn, Hf, Zr, or combinations of these, M.sup.5+ can be V, Nb, Ta, or combinations of these, 0.ltoreq.y.ltoreq.1, the mean ionic radius of the M.sup.3+ cations and the mean ionic radius of the M.sup.5+ cations are each about 0.4 to 1.00 .ANG. when coordinated by six oxygen anions, and the mean ionic radii of the M.sup.4+ cations and the M.sup.5+ cations are each no greater than about 0.53+(0.30.times.the mean ionic radius of the M.sup.3+ cations). The compound can be made by a dry powder method that involves providing a homogeneous powder mixture of raw materials to form the compound, shaping the mixture into a preform, and firing the preform at a sufficient temperature and for a sufficient time to form the product compound. The compound can be made by a sol gel method that involves providing the raw materials in solution form, drying the solution to obtain a sol gel powder, calcining, pulverizing, and shaping the sol gel powder, followed by firing.

REFERENCES:
patent: 4925816 (1990-05-01), Watanabe et al.
patent: 4973460 (1990-11-01), Flanigen et al.
patent: 5420091 (1995-05-01), Kuroda et al.
"Silicophosphates with an intersecting tunnel structure: AM.sub.3 P.sub.6 Si.sub.2 O.sub.25 ", Materials Chemistry and Physics, 12 (1985) 537-543; No Month.

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