A study of the microstructure of the rapidly solidified Sm2Fe17N3-x alloy was carried out using transmission electron microscopy. A new hexagonal Sm2Fe17 phase, with space group P6(3)/mmc and lattice parameters a = 0.854 and c = 0.828 nm, was found. This hexagonal phase is metastable and can only be formed during rapid solidification. The high resolution image also identified many 2:17H domains inside the 2:17R phase. Large-angle trigrain boundaries with a 120-degrees rotation relationship between any two c axes were often formed in the alloy.
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