Phase equilibria in the ternary Nd-Cs-Si system up to a Co:Nd atomic ratio of 2:1 and an Si:Nd atomic ratio of 3:5 were studied by means of X-ray powder diffraction. A total of seven ternary compounds were identified. Among the seven ternary compounds found in this system, the solid solubility of two compounds had not been reported previously: NdCo13-xSix with 2.5 less than or equal to x less than or equal to 4 and NdCo11-xSix with 1.2 less than or equal to x less than or equal to 1.8. Other new information includes the crystal structure of NdCo13-xSix. It has a tetragonal structure, related to the NaZn13-type, with a = 7.811-7.763 Angstrom, c = 11.430-11.464 Angstrom, and the atomic ordering is similar to Ce2Ni17Si9. A limited solid solution range has also been found for Nd2Co17-xSix. This isothermal section consists of 26 three-phase and four two-phase regions.
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