The conduction characteristics in oriented polypropylene (OPP) film were studied over field intensities between 10 and 300 MV/rn and a range of temperature from 5 to 55°C. The range of the conduction characteristics observed at 15°C was divided into five regions with increasing field intensity. Particularly, in the region from 70 to 82 MV/rn voltage-controlled negative resistance was displayed. In the negative resistance region, current oscillations were also observed and the mobility of carriers was 1.44 >< 10_is m2/V s. The negative resistance characteristics could be explained by Gibbons' theory. ABSTRACTThe conduction characteristics in oriented polypropylene (OPP) film were studied over field intensities between 10 and 300 MV/m and a range of temperature from 5 to 55°C. The range of the conduction characteristics observed at 15°C was divided into five regions with increasing field intensity. Particularly, in the region from 70 to 82 MV/m voltage-controlled negative resistance was displayed. In the negative resistance region, current oscillations were also observed and the mobility of carriers was 1.44 x 10 -" 3 m2/V s. The negative resistance characteristics could be explained by Gibbons' theory. ABSTRACTElectrochemical hydrogen absorption and desorption into/from Pd and Pd-Li alloys were studied in a molten LiCl-KC1-LiH system (5 mole percent LiH added) at 673 K. A cyclic voltammogram for a Pd electrode indicates that the current is largely due to a hydrogen-related reaction and partly due to a Li-related reaction. Pd spontaneously changes into PdLiH, merely by immersion into the molten LiCl-KCl-LiH system, because the anodic hydrogen absorption and the cathodic lithium deposition occur on the same surface. By chronopotentiometry, H/Pd ratios were estimated for Pd, Pd 7 Li, Pd 2 Li, and PdLi electrodes after hydrogen charging at 0.6 V for 0.5 h as 0.05, 0.08, 0.27, and 0.74, respectively. These results show that the hydrogen absorbing ability of the alloys increases as the Li concentration increases. These characteristics can be explained by the stronger interaction of Li-H than of Pd-H.