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Bulk Cu50Zr42Al8 amorphous coniform shape samples (10mm in diameter at bottom and 80mm in length) were successfully prepared by the arc-melting master alloy in the water-cooled copper crucible and then suck cast in the copper mold. Using the techniques of X-ray diffraction, Optical microscope, SEM and TEM analysis. The experimental investigation of the samples research of axial and radial characteristics...
Various loading amount of La-CuO/TiO2 were synthesized via a one step sol-gel process. The crystal structure and chemical properties were characterized using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). XRD analysis revealed that two characteristic peaks at 35.54° and 38.76° according to cubic CuO were observed in the X-ray diffraction patterns of La-CuO/TiO2. Ti4+, Olat into...
For electroplated Sn and Sn alloy finishes, one of the reliability concerns remains the risk of whisker growth. Results from recent work have suggested that whiskers are most likely to form in regions of the films where high stress or a stress gradient exists. If strain/stress distribution information can be collected at a grain-by-grain level, correlations between such information and the propensity...
Due to their influence on the mechanical properties, residual stresses in thin films have become an important topic in materials science. The elastic constants are required to determine the residual stresses using X-ray diffraction method. The elastic constants of Cu thin films with ideal fibre textures were calculated using the Voigt, Reuss and Hill model in the present work. The results show that...
Solidification/stabilization (S/S) is considered to be a well-established disposal technique to reduce sludge handling and disposal obstacles. In this work, the sewage sludge was solidified at variable proportions with magnesium oxychloride cement (denoted as MOC therinafter) as reagent. The mortar prism samples of 40 times 40 times 160 mm in dimension were prepared and hardened for 24 hours at room...
To evaluate tin-whisker growth during thermal cycling tests, a simulation technique for calculating the change in atomic-density distribution of tin caused by a change in temperature, which induces a stress gradient in polycrystalline tin plating, was developed. This technique uses the finite-element method (FEM), molecular-dynamics (MD) simulation, and X-ray diffraction (XRD). Specifically, an FEM...
The polycrystalline samples of BaSi2, SrSi2, and LaSi were prepared by spark plasma sintering (SPS). The electrical resistivity (rho) and Seebeck coefficient (S) were measured above room temperature. The S of BaSi2 was negative and the absolute values were rather high (-669 muVK-1 at 337 K). The S of SrSi2 was positive and the absolute values were lower (118 muVK-1 at 332 K) than those of BaSi2. For...
We report thermoelectric characterization of Bi2-xSbxTe3 (x = 0.5, 1.0, and 1.5) synthesized by a solvothermal method using DMF as solvent. For Bi2Te3, the size of the edge and thickness of the hexagonal nanoplatelets are 200-250 nm and 20-25 nm, respectively. Bi2Te3 nanosheets appear to grow epitaxially from the surface of the Te tubes, which forms in the first step and acts as the template for the...
Bulk nanostructured (Bi,Sb)2Te3 compounds and GeTe based amorphous/nanocrystal composites have been successfully fabricated by the combined hydrothermal/hot-pressing and quenching/annealing methods, respectively. The (Bi,Sb)2Te3 nanopowders synthesized by hydrothermal method exhibit a hollow-like structure. After hot-pressing, the nanoscale grains varying from tens to hundreds of nanometers were found...
The SrTiO3 and Y-doped SrTiO3 polycrystalline sintered bodies were synthesized by the polymerized complex (PC) process and the subsequent hot pressing at 1473 K for 1 h or at 1673 K for 2 h in Ar atmosphere. The X-ray diffraction patterns of the SrTiO3 and Sr0.9Y0.1TiO3 samples synthesized by the PC process and hot pressing at 1473 K showed that these samples were mostly composed of the SrTiO3 single...
Hf1-xZrxTe5, which is expected to have high thermoelectric performance at low temperature, is investigated on polycrystals with high density. in order to examine the possibility of large enhancement of the figure of merit at low temperature, polycrystalline samples of Hf1-xZrxTe5 (x=0.0, 0.5 and 1.0) are systhesized by hot-press sintering to make high density above ~90%. Resultant polycrystals show...
Alkaline metal (AM) atoms filled CoSb3 skutterudites are synthesized by melting method and sintered by spark plasma sintering. The maximal filling fraction or filling fraction limit (FFL) of AM (AM=Li, Na, K, Cs) in CoSb3 are estimated experimentally and show good agreement with our previous calculations based on density functional method. The effect of thermodynamics properties on FFL, crystallographic...
Nanostructuring is one of the effective approaches to lower the thermal conductivity of materials. Nanostructured skutterudite-related compounds CoSb3, Fe0.5Ni0.5Sb3, Fe0.25Ni0.25Co0.5Sb3 and Te-doped CoSb3 were synthesized by a solvothermal route. The bulk materials were prepared by hot pressing or spark plasma sintering from the solvothermally synthesized nanopowders. The thermal conductivity values...
We report on the technology of formation of sandwich structures based on fullerite films and on experimental results in research of optical and conductivity properties of these sandwich samples. Single crystals of sapphire (100) or silicon were used as substrates. The sandwich specimens were based on the structure M/C/sub 60//M (M = Cr, Pd, Ag, Al, Cu). The thickness of the fullerite films was /spl...
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