Annealing Effects on Bi Doped Se-Te System
Annealing reduces the randomness and effects the adjustment of relative position between the layers. The annealing may provide a deeper insight into the mechanism of disorder and defect formation in the amorphous chalcogenides. A lot of research has been done on the study of the effect of thermal annealing on the optical properties of the semiconducting chalcogenide glasses, which has not been amply supported by corresponding experimental data on the effect of thermal annealing on the electrical properties. So, the effect of thermal annealing on the electrical properties and optical properties of Se–Te-Bi (2≤x≤8) chalcogenide glasses has been briefly discussed in the present paper. The annealing in the present study has been done below glass transition temperature.
Abstract Two new series of compounds exhibiting nematic and smectic reentrant mesophases are presented here; the first one is 4-n-alkoxy benzoyloxybenzylidene 4'-cyanoaniline series the second one the 1-(4-n-alkylbenzoyloxyphenyl) 2-(4'-cyanophenyl) ethane series. Isobaric binary phase diagrams are plotted for each compound by means of the contact method and the mesophases so identified.