Subhalides of tellurum: electrical conductivity in relation to crystal structure

Subhalides of Te are compounds of the type Te yX with yges1 and X=Cl, Br, I. Within this group of compounds the structural building unit of elemental tellurium-the Te-screw with 3 1 or 3 2 symmetry-is continuously modified and yields a series of crystal structures from one-dimensional Te-Te arrangements to a zero-dimensional type. The authors show qualitatively how the electrical conductivity of these compounds is correlated to the various crystal structures. Gap energies are determined from the temperature dependence of the electrical conductivity

Non-aqueous electrolyte solutions in chemistry and modern technology

In this paper a brief survey is given of the properties of non-aqueous electrolyte solutions and their applications in chemistry and technology without going into the details of theory. Specific solvent-solute interactions and the role of the solvent beyond its function as a homogenous isotropic medium are stressed. Taking into account Parker's statement1) ldquoScientists nowadays are under increasing pressure to consider the relevance of their research, and rightly sordquo we have included examples showing the increasing industrial interest in non-aqueous electrolyte solutions. The concepts and results are arranged in two parts. Part A concerns the fundamentals of thermodynamics, transport processes, spectroscopy and chemical kinetics of non-aqueous solutions and some applications in these fields. Part B describes their use in various technologies such as high-energy batteries, non-emissive electro-optic displays, photoelectrochemical cells, electrodeposition, electrolytic capacitors, electro-organic synthesis, metallurgic processes and others. Four Appendices are added. Appendix A gives a survey on the most important non-aqueous solvents, their physical properties and correlation parameters, and the commonly used abbreviations. Appendices B and C show the mathematical background of the general chemical model. The Symbols and abbreviations of the text are listed and explained in Appendix D