Temperature dependence of magnetisation of intermetallic compound GdFe11Ti in different structural states

The temperature dependence of magnetisation σ(T) and the structure of GdFe11Ti intermetallic compound in coarse-grained, microcrystalline, and nanocrystalline states are investigated experimentally. It is found that thermal stability of GdFe11Ti compound depends on grain size. The phase composition of the coarse-grained sample remains unchanged upon heating to 1100 K. Microcrystalline powder with a grain size of ∼1 μm undergoes partial decomposition and transformation into iron phase during grinding and upon heating in the temperature range 800-1100 K. By contrast, heating of bulk nanocrystalline sample up to 1100 K partially restores phase composition