Abstract
Solid solutions in the (Mn1 − x Fe x )1.68Sn system (x ≤ 0.5) with a Ni2In-type structure are synthesized by the solid-phase reaction method in a stepwise temperature regime. The unit cell parameters a and c decrease with an increase in the iron concentration in the alloys and become equal to a = 0.430 nm and c = 0.538 nm for the (Mn0.5Fe0.5)1.68Sn alloy. A superstructure with the unit cell parameters a ss = 3a and c ss = c is revealed in alloys of the system under investigation. The specific magnetization of the alloys increases nonlinearly from 53 G cm3 g−1 in the Mn1.68Sn alloy to 72 G cm3 g−1 in the (Mn0.5Fe0.5)1.68Sn solid solution. The Curie temperature changes from 270 K in the initial alloy of the composition Mn1.68Sn to 365 K in the alloy of the composition (Mn0.5Fe0.5)1.68Sn. All solid solutions in the (Mn1 − x Fe x )1.68Sn (x ≤ 0.5) system exhibit metallic conductivity in the temperature range from 77 to 450 K.
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