Abstract:The new type of rare earth iron intermetallic compounds R₃(Fe, Mo)₂₉in the field of permanent magnetic materials have been paid more attention to, but it is very difficult to prepare a single phase 3∶29. The preparation of a single phase R₃(Fe, Mo)₂₉(R=Ce, Nd, Sm, Gd, Tb, Dy and Y) including the effects of the content of stabilizing element Mo, rare earth Y and annealing conditions on the formation of R₃ (Fe, Mo)₂₉compounds, has been discussed in detail. The results showed that the content of stabilizing element Mo in single phase 3∶29 compounds is equal to the corresponding Mo contentxat maximum Curie temperatures of 2∶17 phase in nominal composition R₃(Fe_1-xMox)₂₉under the unsuitable annealing conditions. The single phase 3∶29 compounds can be prepared at thisxvalue by verifying the annealing temperatures.

Key words: 3∶29 compounds　preparation　a single phase