Thermolysis of the single source precursor (Et2Bi)2Te in DIPB at 80 °C yielded phase-pure Bi4Te3 nanoparticles, while mixtures of Bi4Te3 and elemental Bi were formed at higher temperatures. In contrast, cubic Bi2Te particles were obtained by thermal decomposition of Et2BiTeEt in DIPB. Moreover, a dual source approach (hot injection method) using the reaction of Te(SiEt3)2 and Bi(NMe2)3 was appl...

We have used HRTEM and STEM EDX to determine the important roles of endotaxial nanostructures in a lead-free thermoelectric (TE) material, SnCd0.03Te, with 2% CdS and 2% ZnS; where maximum ZTs of ~1.3 and ~1.1 are achieved at 873 K, respectively. TE materials convert wasted heat into electric energy. The conversion efficiency of TE materials is characterized by a dimensionless figure of merit Z...

The general picture established so far for the links between superconductivity and magnetic ordering in iron chalcogenide Fe1+y(Te(1-x)Sex) is that the substitution of Se for Te directly drives the system from the antiferromagnetic end into the superconducting regime. Here, we report on the observation of a ferromagnetic component that developed together with the superconducting transition in F...

Recently, Cu2-δS and Cu2-δSe were reported to have an ultralow thermal conductivity and high thermoelectric figure of merit zT. Thus, as a member of the copper chalcogenide group, Cu2-δTe is expected to possess superior zTs because Te is less ionic and heavy. However, the zT value is low in the Cu2Te sintered using spark plasma sintering, which is typically used to fabricate high-density bulk s...

Observations of clusters in the 30 to 350 GHz range can in principle be used to determine a galaxy cluster’s Comptonization parameter, y, peculiar velocity, v and gas temperature, Te via the dependence of the kinetic and thermal Sunyaev-Zeldovich (SZ) effects on these parameters. Despite the significant contamination expected from thermal emission by dust in high-redshift galaxies, we find that...

Exchange coupling between localized spins and band or topological states accounts for giant magnetotransport magneto-optical effects as well determines spin-spin interactions in magnetic insulators semiconductors. However, even archetypical dilute semiconductors such ${\mathrm{Cd}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$ ${\mathrm{Hg}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$ the...

We investigate accretion disc models for the X-ray emission of Seyfert-1 galaxies and the hard state of black-hole binaries. We concentrate on two hot accretion disc models: advection-dominated accretion flow (ADAF) and recently found luminous hot accretion flow (LHAF). We solve for the global solution of both ADAF and LHAF to obtain the electron temperature, Te, and Thompson optical depth, τ ,...

Heavily doped compounds Mo3Sb7 xTex (x 1⁄4 0, 1.0, 1.4, 1.8) were synthesized by solid state reaction and sintered by spark plasma sintering. Both X-ray diffraction and electron probe microanalysis indicated the maximum solubility of Te was around x 1⁄4 1.8. The trends in the electrical transport properties can generally be understood using a single parabolic band model, which predicts that the...