Improving the thermoelectric Seebeck coefficient, while simultaneously reducing thermal conductivity, is required in order to boost thermoelectric (TE) figure of merit (ZT). A common approach to improve the Seebeck coefficient is electron filtering where 'cold' (low energy) electrons are restricted from participating in transport by an energy barrier (Kim and Lundstrom 2011 J. Appl. Phys. 110 0...

Among physical vapor deposition techniques thermal evaporation (TE) is the one with the longest standing tradition. However, during the last 30 years of booming semiconductor industry which involves a great deal of thin film technology, deposition techniques like CVD (chemical vapor deposition) or sputtering which often offer unquestionable advantages have been developed to perfection and TE ha...

The thermoelectric (TE) devices are based on the Seebeck and Peltier effects, which describe the conversion between temperature gradient and electricity. The effectiveness of the material performance can be described by its figure of merit, ZT, which is defined as ZT = T , where a is the Seebeck coefficient of the material, a is the electrical conductivity and K is the total thermal conductivit...

The effectiveness of magnetic resonance imaging (MRI) to monitor thermal lesions created by High Intensity Focused Ultrasound (HIFU) in rabbit liver in vivo is investigated. The MRI sequences of T1-weighted, and T2-weighted fast spin echo (FSE) were evaluated. The main goal in this paper was to find the range of repetition time (TR) and range of echo time (TE) which maximizes the contrast to no...

Abstract The aim this work was the reinvestigation of phase equilibria in Bi-Te system. as-cast and long-time equilibrated alloys binary system were analysed by scanning electron microscopy, X-ray diffraction (XRD) differential thermal analysis (DTA) methods. primary solidified phases identified for samples. existence four intermetallic phases: Bi 2 Te 3 , BiTe, Te, 7 confirmed. Three them melt...

Mn2Ge2Te6 shows intrinsic ferromagnetic (FM) order, with a Curie temperature (Tc) of 316 K. The FM order origins from superexchange interaction between Mn and Te atoms. is half-metal (HM), spin-β electron semiconductor gap 1.462 eV. tends to show in-plane anisotropy (IPA), magnetic energy (MAE) −13.2 meV/f.u. good dynamical thermal stability. Moreover, presents half-metallic stability under cha...

We present detailed studies of potassium doping in PbTe(1-y)Se(y) (y = 0, 0.15, 0.25, 0.75, 0.85, 0.95, and 1). It was found that Se increases the doping concentration of K in PbTe as a result of the balance of electronegativity and also lowers the lattice thermal conductivity because of the increased number of point defects. Tuning the composition and carrier concentration to increase the dens...

Wearable thermoelectric generators (TEGs) harvest thermal energy generated by the body to generate useful electricity. The performance of these systems is limited by (1) the small working temperature differential between the body and ambient, (2) the desire to use natural air convection cooling on the cold side of the generator, and (3) the requirement for thin, lightweight systems that are com...

A Michelson interferometer was used as a precise detector in the Mirage effect configuration in order to determine the thermal diffusivity of the diluted rnagnetic semiconductor Cd, -,Mn,Te, in the concentration range O<x<0.6 at roorn ternperature. This zinc-blende temary alloy exhibits an alrnost linear behavior of the thermal diffusivity as a function of Mn concentration. This trend is simila...

The influence of the boundary layer properties on the heat transport in turbulent thermal convection is experimentally investigated in a cell with a rough bottom plate. It is shown that the standard 2/7 exponent of the convective heat flow dependence on the Rayleigh number, usually observed in cell with smooth boundaries, increases if the roughness has power law distributed asperity heights and...