Abstract: Bulk iron-based magnetic materials containing high content of α″-Fe₁₆N₂ phase were prepared by gas-solid reaction. The content of α″-Fe₁₆N₂ phases， phase transformation and magnetic properties in each sample with different annealing parameters were measured by XRD， optical microscope and vibration magnetometer. The result shows that the samples， prepared by gas-solid reaction nitriding， homogenizing， quenching and tempering， contain high content of α″-Fe₁₆N₂ phase. When the tempering temperature is 150℃ and the time is 4.5h， the content of α″-Fe₁₆N₂ phase is highest， reaching 50.57 wt %. The saturated magnetic pole strength is 223.6A

Key words: α″-Fe₁₆N₂, magnetic materials, iron-based, tempering, magnetic property