ChemInform Abstract: Crystal Structure and Phase Relations for Mn3Sn2 and Non- Stoichiometric Mn2-xSn.

✍ Scribed by M. STANGE; H. FJELLVAAG; S. FURUSETH; B. C. HAUBACK

• Book ID: 101858979
• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 30 KB
• Volume: 28
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199750028

✦ Synopsis

Crystal Structure and Phase Relations for Mn3Sn2 and Non-Stoichiometric Mn2-xSn.

-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.