热膨胀系数和磁性可调的Mn_(0.983)CoGe/环氧树脂复合材料北大核心CSCD

为解决环氧树脂(Epoxy)热膨胀系数较大、热导率较低的问题,我们通过固相反应法制备了巨负膨胀材料Mn_(0.983)CoGe,并将不同体积分数的Mn_(0.983)CoGe粉末(平均颗粒直径~10μm)均匀分散至Epoxy中,制备成Mn_(0.983)CoGe/Epoxy复合材料.研究结果表明仅需加入体积分数为22.5vol.%的Mn_(0.983)CoGe,复合材料即在267 K^320K的温度区间内呈现近零的热膨胀系数.并且,Mn_(0.983)CoGe/Epoxy复合材料的热导率也随着Mn_(0.983)CoGe填充量的增加而显著提升.例如当复合材料中Mn_(0.983)CoGe填充量为30vol.%时,其150K处的热导率提升近3倍.此外,我们还发现,在与Epoxy复合之后,由于受到Epoxy基体产生的应力的影响,Mn_(0.983)CoGe磁结构相变温区展宽,同时六角相到正交相的转化率也显著降低.     

Anomalous low-temperature heat capacity in antiperovskite compounds

The low-temperature heat capacities are studied for antiperovskite compounds AX M_3(A = Al, Ga, Cu, Ag, Sn, X = C,N, M = Mn, Fe, Co). A large peak in(C- γ T)/T~3 versus T is observed for each of a total of 18 compounds investigated,indicating an existence of low-energy phonon mode unexpected by Debye T~3 law. Such a peak is insensitive to the external magnetic field up to 80 k Oe(1 Oe = 79.5775 A·m-1). For compounds with smaller lattice constant, the peak shifts towards higher temperatures with a reduction of peak height. This abnormal peak in(C- γ T)/T~3 versus T of antiperovskite compound may result from the strongly dispersive acoustic branch due to the heavier A atoms and the optical-like mode from the dynamic rotation of X M_6 octahedron. Such a low-energy phonon mode may not contribute negatively to the normal thermal expansion in AX M_3 compounds, while it is usually concomitant with negative thermal expansion in open-structure material(e.g., ZrW_2O_8, Sc F_3).