Nanocrystalline Soft Magnetic Materials Fe <sub> 7 </ Sub> 3.5cu <sub> 1 </ Sub> Nb <sub> 3 </ Sub> Si <sub> 1 </ Sub> 3.5b <sub> 9 < / Sub> Neutron Diffraction Study

The microstrutures of Fe_73.5Cu₁Nb₃Si_13.5B₉, nanocrystalline softmagnetic material which was anealed at three different temperature werestudied by means of neutron diffraction.The results showed amorphous ribbons Fe_73.5Cu₁Nb₃Si_13.5B₉ wereturned into a well ordered α-Fe(Si) solid solution ─ Fe₃Si with DO₃structure which is diffrent from other articles mentioned that it is α-Fe(Si)solid solution with bcc structure after they were anealed at three differenttemperature(793K,823K, 853K) for one hour. we firstly confirmed that Siatoms and a few Fe atoms occupy the 4a site and Fe atoms mainly occupythe 4b and 8c sites,and the content of Si atom is l8.7 at% and its averagegrain dimension is 9.2nm in #1 (793K) sample; content of Si atom is 19.8at% and its average grain dimension is 8.9nm in #2 (823K) sample;content of Si atom is l8.3 at% and its average grain dimension is l0.0nmin #3(853K) sample.Especcialy,the reason that cell parameter enlarged issome B atoms went into the 48h site in #3(853) sample. It is obviousthat #2(823K) sample has the highest content of Si atom(19.8 at%) andthe minimum average grain dimension(8.9nm) comparing the results ofthe three samples. Perhaps this is one of the main reasons that the#2(823K) sample has the best soft magnetism properties.