On the way toward the synthesis of novel magnetic alloys with late 6p elements (Bi, Pb) and 3d transition metals, we studied a general approach to obtain intermetallic formulations of their analogues with Sn and Sb. Additional motivation came from the need for new Sn-based battery electrode materials, which withstand charge/discharge volume changes, as tin enables new generation high-energy lithium and sodium batteries. A variety of nanoscale transition metal stannides MSnx where M=Cr-Cu and Ge, including unreported compositions, has been synthesized using the general approach via the optimized reaction of metal alkylamidinate complexes, M(R’-C(NHR)2)z, with Sn(II) precursors. The general trends of metal reactivity with tin have been established and led to formation of size-controlled nanoparticles of these alloys with size variation below 10%. The nanocrystals are synthesized in a one-pot reaction via the in-situ nucleation of a beta-Sn “template” seeds, followed by the reduction of Mz+ cation and the diffusion of M0 into the liquid Sn lattice, as demonstrated by time-resolved XRD and TEM. Preliminary results on the use of the developed approach for the formation of 3d-6p alloys together with their magnetic properties will also be presented.

General synthetic strategy toward metal stannides, materials for next generation batteries

2019 Fall National Meeting

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