Abstract
57Fe Mossbauer spectra and magnetic properties of YTi(Fe1-xNix)11 (x=0-0.6) have been studied. Mossbauer spectra show that the hyperfine fields of the three iron sites and the average hyperfine field increase at first, then decrease and have a maximum between the Ni concentrations x=0.2 and 0.3. The Ni atoms preferentially occupy the 8f site and the Fe atoms the 8i site at Ni concentrations of x<or=0.3 according to the Mossbauer subspectral areas. Magnetic measurements indicate that both the saturation magnetizations at room temperature and the Curie temperatures increase at first and then decrease with Ni substitution. The maximum of the saturation magnetization is 127 emu g-1 at a Ni concentration of x=0.1 and that of the Curie temperature is 602 K at x=0.3. The concentration dependences of the saturation magnetizations and the Curie temperatures are calculated using Ms=11((1-x) mu Fe+x mu Ni) and Tf=(1/2N)(nFe-FeTFe-Fe+nNi-NiTNi-Ni+((nFe-FeTFe-Fe-nNi-NiTNi-Ni)2+4nFe-NinNi-FeT2Fe-Ni)12/), respectively. The results obtained are in accord with the experimental data.
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