Silicon/phosphorus substitution in FeP (MnP-type structure, space group Pnma) has been studied by 57Fe Mossbauer spectroscopy. The compound FeP0.85Si0.15 was prepared and the unit cell dimensions were determined to be a = 5.2267(3) A, b = 3.0704(3) A and c = 5.8321(4) A. The 57Fe Mossbauer effect shows that increasing the number of Si neighbours around the iron atoms increases the electric quadrupole splitting and the magnetic hyperfine field, and decreases the center shift. The Neel temperature is 100 K and the magnetic structure is similar to that observed in FeP, with the spins bunched along the crystallographic a-direction.
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