Moessbauer Spectroscopy Studies of Some Intermetallics in the Zr―Nb―Fe System

摘要

Samples with the following compositions: Zr_(62)Nb_(14)Fe_(24), Zr_(65)Nb_(10)Fe_(25) and Zr_(52)Nb_(10)Fe_(38) were studied by Moessbauer spectroscopy. All of them showed a ternary cubic Ti_2Ni-type phase (QS: 0.30 +- 0.02, IS: ―0.14 +- 0.01) and traces of Zr_2Fe phase (QS: 0.86 +- 0.03, IS: ―0.29 +- 0.01). Zrβ phase (QS: 0.22 +- 0.01, IS: ―0.11 +- 0.01) was also detected except in the case of the richer Fe sample. In addition to these expected phases, a hexagonal MgZn_2-type phase was determined. The assigned parameters for this phase are: QS: 0.38 +- 0.04, IS: ― 0.28 +- 0.02. These results suggest a revision of the diagram.