ChemInform Abstract: Crystal Structure and Phase Relations for Mn3Sn2 and Non- Stoichiometric Mn2-xSn.
Abstract
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ChemInform Abstract
In the binary system Mn-Sn, ordered Mn3Sn2 represents a distinct low- temp. phase which on heating decomposes peritectoidally at ≈ 813 K into the non-stoichiometric phase Mn2-xSn and in MnSn2. Synthesis routes which minimize problems with Mn evaporations and phase relations are described. In the temp. range 773 to 1073 homogeneity ranges for Mn2-xSn at 873, 973, and 1073 K are 0.28 . ltoreq. x ≤ 0.34, 0.26 ≤ x ≤ 0.33, and 0.18 . ltoreq. x ≤ 0.23, resp., and Mn3Sn2 has a small homogeneity region of 673 K. Characterization by powder X-ray and neutron diffraction shows that Mn2-xSn crystallizes in the partly filled-up NiAs structure type (P63/mmc) while Mn3Sn2 (orthorhombic, Pnma) is isostructural with Co3Sn2 and Ni3Sn2.
