Abstract
AbstractGlass ceramics with fluoride conduction have been prepared by heat treatment of glasses of the system SiO2‐PbO‐PbF2. The influence of the annealing regime on the formation of crystalline phases and on the structure of the glass ceramics has been investigated. The conductivity has been studied at different stages of crystallization.Two different types of crystallization behaviour have been distinguished when glasses are annealed at about 20 K above Tg. Under these conditions only one single crystalline phase arises in the glass matrix. For glasses with up to 15 mol% PbF2 this crystalline phase is Pb3Si2O7 while at higher PbF2 content the crystalline phase is PbF2.Formation of Pb3Si2O7 causes drastical increase of conductivity due to the rise of fluorine concentration in the residual glass. The growth of PbF2 crystals yields the opposite effect. In some cases, PbF2 crystals built a continous network throughout the glass matrix. Then, conductivity takes place along grain boundaries and the total conductivity increases again.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
