Oxyhalide glasses

Oxyhalide Glasses. Many glasses contain both oxide and haUde anions. The introduction of haUdes into an oxide glass typically serves to reduce the glass-transition temperature, T, and to increase the coefficient of thermal expansion. Oxyfluorophosphates have been investigated as laser host... 

Chemical transport reactions involving the element and/or an elemental subhalide and a transition metal halide/oxyhalide. The components are heated in evacuated sealed glass tubes at 100-300 °C for a period of days to weeks. Applying a small temperature gradient (10-20 °C) leads to gas phase transport and crystallization at the cooler end of the ampoule [19]. 

Oxyhalides Halogens + 02 hydrogen halides + 02 Fused silica, glass, metals, alumina, alkaline chlorides, alkaline earth chlorides... 

The anhydrous halides can be purified by sublimation in vacuo, but owing to a tendency to react with silica, contact with hot glass, thereby forming the oxyhalide, should be avoided. 

The last three chapters summarize unique structural and chemical features of a variety of glasses. They also provide an overview of the important aspects of the glass systems. Chapters 12 and 13 discuss respectively oxide and chalcogenide glasses particularly in view of their chemistry, structure and a number of special phenomena associated with them. In chapter 14, synthesis, structure and properties of halide, oxyhalide, oxynitride and metallic glasses are discussed. Some aspects of glass-like carbon have also been presented. 

Oxyhalide, oxynitride, and oxycarbide glasses have also been made and studied. The high anionic electrical conductivity observed for some oxyhalides has raised interest in them as possible solid electrolytes. 

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