β Scribed by M Spaeth; K.D Kreuer; Th Dippel; J Maier
No coin nor oath required. For personal study only.
The preparation of pure alkaline metal hydroxides (NaOH, KOH, RbOH, CsOH), their proton diffusion coefficients (D ) H obtained from PFG-NMR measurements and proton conductivities (s) measured by complex impedance spectroscopy are reported for the cubic high temperature phases and melts. For nominally pure material, the measured conductivities are very 27 low, but still due to impurities in terms of water content, whereas proton diffusion is found to be very high ( Β―10 2 21 cm s ) and well reproducible. The unusually high Haven ratios (D /D ) of greater than 10-1000 are suggested to be the H s result of a proton transport mechanism involving correlated proton transfer events, which are discussed in detail.
π SIMILAR VOLUMES
Recent experimental and theoretical results about the temperature and compostion dependence of electrical properties of transition metallic glasses are reviewed. Special attention is paid to the effect of weak localization and electron-electron interaction at lower temperatures as well as to the sat