Crystal structures and ferromagnetism of FexWN2 (x ∼ 0.74, 0.90) with defective iron triangular lattice

- Crystal structures of FexWN2 with defective iron triangle lattice were determined.
- Fe0.74WN2 phase showed weak ferromagnetism at 300 K.
- Decrease in temperature to 5 K suppressed ferromagnetism.
- Approximately quarter defect is likely attributed to ferromagnetism.