The magnetic disaccommodation on polycrystalline Nd doped YIG Y3-xNdxFe5O12 (0 < x < 2.5) is studied in this work. It reveals a very different behaviour with the sintering atmosphere. The results of magnetic disaccommodation for samples sintered in air show a relaxation peak with the maximum at a temperature changing from 120 K to 100 K with increasing doping rate. When the secondary perovskite phase appears with x = 2.0, another relaxation process at around 300 K emerge, similar to the well-known III peak of polycrystalline magnetite. For CO2 sintered. samples, the process at 120 K exhibit magnetic accommodation features (i.e. increase of apparent magnetic permeability after demagnetization), and vanishes with increasing Nd substitution, together with the appearance of the 300 K peak associated with the perovskite secondary phase which appears with x > 1.2 doping rate.