Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1986-02-04
1987-03-17
Carter, H. T.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C01G 2900, C01G 1700
Patent
active
046506594
ABSTRACT:
The invention relates to a process for the preparation of bismuth germanate of formula Bi.sub.4 Ge.sub.3 O.sub.12.
According to this process, into an aqueous solution is introduced a bismuth compound such as Bi(NO.sub.3).sub.3, 5H.sub.2 O and a germanium compound such as GeO.sub.2, which are respectively able to release into the solution soluble bismuth complexes and soluble germanium complexes. The pH and temperature of the solution in the stability range of the Bi.sub.4 Ge.sub.3 O.sub.12 phase are then brought to value such that there is a simultaneous release of soluble bismuth and germanium complexes and they are reacted to form a precipitate of Bi.sub.4 Ge.sub.3 O.sub.12. The pH is generally approximately 0.5 to 5 and the temperature is below 120.degree. C.
REFERENCES:
patent: 4330524 (1982-05-01), Grabmaier et al.
Grabmier et al, "Zeit fur Kristallographie", vol. 149, 1979, pp. 261-267.
Speranskaya et al, "Russian Journal of Inorganic Chem.", vol. 9, Feb. 1964, pp. 226-231.
Carter H. T.
Commissariat a l''Energie Atomique
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