| 摘要 |
The invention relates to a process for the preparation of bismuth germanate of formula Bi4Ge3O12. According to this process, into an aqueous solution is introduced a bismuth compound such as Bi(NO3)3, 5H2O and a germanium compound such as GeO2, 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 Bi4Ge3O12 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 Bi4Ge3O12. The pH is generally approximately 0.5 to 5 and the temperature is below 120 DEG C. |
