Truong D Y Nhi, Kleinke Holger, Gascoin Franck
Laboratoire CRISMAT UMR 6508 CNRS ENSICAEN, 6 boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
Dalton Trans. 2014 Oct 28;43(40):15092-7. doi: 10.1039/c4dt01441c. Epub 2014 Sep 11.
Composites made of Higher Manganese Silicide (HMS)-based compound MnSi1.75Ge0.02 and multi-walled carbon nanotubes (MWCNTs) were prepared by an easy and effective method including mechanical milling under mild conditions and reactive spark plasma sintering. SEM compositional mappings show a homogeneous dispersion of MWCNTs in the HMS matrix. Electronic and thermal transport properties were measured from room temperature to 875 K. While power factors are virtually unchanged by the addition of MWCNTs, the lattice thermal conductivity is significantly reduced by about 30%. As a consequence, the maximum figure of merit for the composites with 1 wt% MWCNTs is improved by about 20% compared to the MWCNT free HMS-based sample.
采用一种简便有效的方法制备了由高硅化锰（HMS）基化合物MnSi1.75Ge0.02和多壁碳纳米管（MWCNTs）组成的复合材料，该方法包括在温和条件下进行机械球磨和反应性火花等离子体烧结。扫描电子显微镜（SEM）成分映射显示MWCNTs在HMS基体中均匀分散。在室温至875K范围内测量了电子和热输运性质。虽然添加MWCNTs后功率因子基本不变，但晶格热导率显著降低了约30%。因此，与不含MWCNTs的HMS基样品相比，含1wt%MWCNTs的复合材料的最大优值提高了约20%。
