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The structure, Curie temperature and magnetostriction of Pr0.15Tb0.30Dy0.55Fe1.85Cx (x=0-0.1) compounds were investigated by X-ray diffraction, a vibrating sample magnetometer and a standard strain technique.All the samples show entirely MgCu2-type Laves phase structure.The lattice parameter and Curie temperature increase with C content increasing.The magnetostriction at high magnetic field shows maximum value at x=0.05.