Glass alkali glasses

Another widely studied phenomenon in alkah borate glasses is the mixed alkah effect, the nonlinear change in glass properties when a second kind of alkah oxide is added into the single-alkali glass. Models have been suggested to explain the mixed alkah effect (144), but a universally accepted model has not been developed as of this writing. 

Dichroma.te(VI) Glasses. Alkali dichromate(VI) glasses exist in systems such as Li2Cr20y—Na2Cr20y. The glass-transition temperatures of the dichromates are very low, about 0°C. The addition of chlorides or nitrates aids in glass formation. 

Slides Plastic cavitation around inclusions in metals (e.g. metallographic section through neck in tensile specimen) SEM pictures of fracture surfaces in ductile metals, glass, alkali halide crystals. 

Glasses for electrical and electronic components are represented by the lead tubing and cathode-ray-tube screen and cone glasses. These glasses do not operate under severe corrosion conditions, but surfaces must not leach excessive alkali under damp conditions or electrical breakdown can occur. The glass compositions are formulated to give the maximum electrical resistivity and moisture resistance compatible with other necessary properties. 

Day, D.E. (1976). Mixed alkali glasses - their properties and uses. Journal of... 

AR-glass, alkali resistant, particularly intended for the reinforcement of concrete. Table 6.3 displays the average compositions and main features concerning the glass fibres... 

Fig. 4.1 Arrhenius plots for ionic conductivity, (a) General behaviour for ionically conducting glasses. At room temperature, the most conductive (Li or Ag ) have the lowest activation energy. For the less conductive glasses (Cs or mixed alkali glasses) the activation energy is around 1 eV. (b) Experimental data for Li conducting glasses (Souquet and Kone, 1986).

Robinson C. C. (1974). Multiple sites for Er in alkali glasses. Jour. Non-Cryst. Solids, 15 1-10. 

Assume that if Figure 15.8 is extrapolated to 200 °C, the viscosity of the lead-alkali glass is 1018 Pa s. Using this viscosity, calculate the strain that would occur in five centuries under a stress of 0.007 Pa. Assume that the stress is caused by the weight of a panel of glass 1/3 m high. Note that... 

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