in neat (no solvent) coprecipitation from aqueous solns.; powders dried at 120°C, calcinated (500.degee.C) and roasted (1400°C) in a CO atmosphere for 1 h; rapid cooling;
参考文献
Inorganic Materials (Transl. of Neorg. Mater.), , vol. 24, p. 372 - 375
Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, , vol. 24, p. 457 - 461