作者: Gianfranco Dell'Agli, Giuseppe Mascolo, Maria Cristina Mascolo, Concetta Pagliuca, Paolo Perna, Umberto Scotti Di Uccio
摘要: Mechanical mixtures of zirconia xerogel with variable content of crystalline Y2O3 up to 25
mol%, were hydrothermally treated by microwave route at 110 °C for 2 hours in the presence of 0.2 M
solution of (KOH+K2CO3) mineralizer. The resulting amorphous hydrated zirconia-yttria solid
solutions with a maximum solubility of Y2O3 content between 20 ~ 25 mol%, showed a remarkable
reduction of the surface area at the increasing Y2O3 content of the starting mixture. The
as-synthesized products and the corresponding calcined powders at 400 °C were uniaxially pressed
into pellets (10 x 7 x 2 ~ 4 mm, in width) at 150 MPa. Conductivities were measured at 25 °C by AC
impedance method with a frequency range from 10 Hz to 1 MHz with the pellets equilibrated either
under silica gel or under increasing relative humidity (RH) up to ~90 %. The effects of composition,
surface area, calcination temperature and relative RH on the proton conductivity of the amorphous
solid solutions are discussed.
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作者: Kwan Ho Park, Il Ho Kim
摘要: Co4-xFexSb12-ySny skutterudites were synthesized by mechanical alloying and hot pressing, and thermoelectric properties were examined. The carrier concentration increased by doping and thereby the electrical conductivity increased compared with intrinsic CoSb3. Every specimen had a positive Seebeck coefficient. Fe doping caused a decrease in the Seebeck coefficient but it could be enhanced by Fe/Sn double doping possibly due to charge compensation. The thermal conductivity was desirably very low and this originated from ionized impurity-phonon scattering. Thermoelectric properties were improved remarkably by Fe/Sn doping, and a maximum figure of merit, ZT = 0.5 was obtained at 723 K in the Co3FeSb11.2Sn0.8 specimen.
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作者: Zheng Chen, Rui Qi Li, Qing Guo
摘要: Conductive polyaniline(PANI) was synthesized by chemical oxidative copolymerization , using dodecylbenzene sulfonic acid (DBSA)as doping agent. PANI-DBSA/ABS conductive films were obtained by solution blending method, using chloroform as organic solvents. The products were characterized by means of digital four-point probe meter, FT-IR spectroscopy, thermal gravimetric analysis (TGA) and inverted metallurgical microscope. The results indicate that PANI-DBSA has good solubility because dodecylbenzene sulfonic acid (DBSA) plays a good doping role in polyaniline. Composite films’ electric conductivity improves with the increasing content of PANI and the percolation threshold is about 10wt% when conducting network formed. TGA curves demonstrate that product’s glass transition temperature is much higher than acrylonitrile-butadiene-styrene resin, furthermore, the thermal stability of composite films also improves compared with polyaniline or resin.
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作者: Rui Yang, Shi Chao Zhang, Lan Zhang, Xiao Fang Bi
摘要: Solid polymer electrolytes (SPEs) which were composed of poly (ethylene oxide) (PEO), poly (lithium acrylate) (PLiAA), and LiClO4 were prepared in order to investigate the influence of LiClO4 content on the ionic conductivity of the electrolyte. All of the membranes were investigated by XRD, DSC, and EIS, et.al. The dependence of SPEs conductivity on temperature was measured, and the maximum ionic conductivity is 5.88×10-6 S/cm at 293 K for membrane which is composed of PEO+PLiAA+15wt% LiClO4. The electrochemical stability window of the PEO+PLiAA+15wt% LiClO4 is 4.75 V verse Li.
53
作者: Zhen Chen, Ye Mao Han, Min Zhou, Rong Jin Huang, Yuan Zhou, Lai Feng Li
摘要: In the present study, the glass microsphere dispersed Bi-Sb thermoelectric materials have been fabricated through mechanical alloying followed by pressureless sintering. The phase composition and the microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. Electrical conductivity, Seebeck coefficient and thermal conductivity were measured in the temperature range of 77~300 K. The ZT values were calculated according to the measurement results. The results showed that the electrical conductivity, Seebeck coefficient and thermal conductivity decreased by adding glass microsphere into Bi-Sb thermoelectric materials. However, the optimum ZT value of 0.24 was obtained at 260 K, which was increased 10% than that of the Bi-Sb matrix. So it is confirmed that the thermoelectric performance of Bi-Sb-based materials can be improved by adding moderate glass microspheres.
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