Structural and magnetic characterization of the new ternary phase Tb3(Fe1-xTix)29

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Abstract
We report the existence and characterization of the stable ternary phase Tb3(Fe1-xTix)29. The structural characterization by X-ray powder diffraction is evidence for a monoclinic structure (P21/c space group) with refined lattice parameters a=10.583(1) AA, b=8.5116(7) AA, c=9.6736(9) AA and beta =97.018(5) degrees . A large magnetovolume effect has been observed in the volume thermal expansion at the order temperature Tc=455 K. The anisotropy has been measured by using the singular point detection technique. Two distinct anisotropy fields of relatively high intensity have been detected. The HA values measured at 6.4 T and 1.9 T at 293 K and both increase markedly with decreasing temperature. Below 200 K, the approach to saturation corresponding to the highest HA develops into a first-order magnetization process.