Syntheses and crystal structures of RE3MnSn 5− x ( RE=Tm, Lu) with 3D Mn–Sn framework

Abstract

Four new isostructural rare earth manganese stannides, namely RE 3MnSn 5− x ( x=0.16(6), 0.29(1) for RE=Tm, x=0.05(8), 0.21(3) for RE=Lu), have been obtained by reacting the mixture of corresponding pure elements at high temperature. Single-crystal X-ray diffraction studies revealed that they crystallized in the orthorhombic space group Pnma (No. 62) with cell parameters of a=18.384(9)–18.495(6) Å, b=6.003(3)–6.062(2) Å, c=14.898(8)–14.976(4) Å, V=1644.3(14)–1679.0(9) Å 3 and Z=8. Their structures belong to the Hf 3Cr 2Si 4 type and feature a 3D framework composed of 1D [Mn 2Sn 7] chains interconnected by [Sn 3] double chains via Sn–Sn bonds, forming 1D large channels based on [Mn 4Sn 16] 20-membered rings along the b-axis, which are occupied by the rare earth atoms. Electronic structure calculations based on density functional theory (DFT) for idealized “RE 3MnSn 5” model indicate that these compounds are metallic, which are in accordance with the results from temperature-dependent resistivity measurements.