In this work, the structural and magnetic properties of ingot and melt-spun Pr₃Fe_24.75Co_2.75Ti_1.5 compounds have been investigated. The structural characterization of the compounds, by X-ray powder diffraction, is evidenced for a monoclinic Nd₃(Fe,Ti)₂₉-type structure (A2/m space group). A 2-type FOMP have been observed in the magnetic AC susceptibility curves of the ingot and melt-spun compounds. Magnetostriction and linear thermal expansion measurements have been performed by the standard strain gauge method in magnetic fields up to 1.5 T, and temperature range of 77 to 575 K. The calculated values of the ordering temperature, the room temperature saturation magnetization for the melt-spun Pr₃Fe_24.75Co_2.75Ti_1.5 compound are several times smaller than the corresponding values obtained in ingot Pr₃Fe_24.75Co_2.75Ti_1.5 compound. The above obtained results have explained the behavior of measured values of spontaneous volume, longitudinal and transverse magnetostriction.

PACS: 75.80.+q, 75.30.Gw