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Fluoride glasses which are used for passive and active optical fibers are subject to devitrification, especially during fiber-drawing. Kinetic parameters may be obtained through isothermal and nonisothermal methods. Basic relations deriving from the Mehl-Avrami-Johnson approach allow the determination of activation energy E a and Avrami exponent n. The paradox of activation energy is expressed...
The thermal decomposition of mixed Zr-Mn oxide hydrates containing 0-0.3 mol of manganese was examined by means of simultaneous TG and DTA. When heated, these mixed hydroxides decompose to an amorphous oxide phase and subsequently crystallize to a cubic phase. These changes are accompanied by a broad endothermic peak at around 165-180°C and an exothermic peak between 450 and 700°C. The temperature...
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