Abstract
The Er2ixThxFe14B (x = 0:5, 1.0, 1.5) polycrystalline compounds have been investigated with 57 Fe Mossbauer spectroscopy in the 50{330 K tem- perature range and magnetometry in the temperature range of 4.2{340 K. Initial magnetization vs. temperature measurements allowed us to establish the temperature regions of reorientations and also the Curie temperatures of the compounds. The spin reorientation phenomena (changes from pla- nar to axial spin arrangements) have been studied extensively by a narrow step temperature Mossbauer scanning in the vicinity of the spin reorienta- tion temperatures. From the analysis of the obtained Mossbauer spectra it was deduced that in the region of transition each subspectrum was split into two Zeeman sextets, which were characterised by difierent hyperflne mag- netic flelds and quadrupole splittings. A consistent way of describing the Mossbauer spectra in the wide range of temperatures was proposed. The composition and temperature dependences of hyperflne interaction param- eters and subspectra contributions were derived from experimental spectra. The transition temperatures were determined for all the compounds studied and the spin phase diagram was constructed.
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