Pb2Y0.5Ca0.5Sr2Cu3O8+x Superconducting Ceramics from Glass Crystallization
Pb2Y0.5Ca0.5Sr2Cu3Oy forms a glass. The glass transition temperature and the first crystallization temperature of the glass are 344°C and 387°C, respectively. The density of the glass is 6.3146 g/cm3. Heat treatments of the glass in air do not produce Pb2Y0.5Ca0.5Sr2Cu3Oy superconducting phase at all temperatures, but heat treatments of the glass in argon yield the Pb2Y0.5Ca0.5Sr2Cu3Oy phase starting at 430° C. After being heat treated at 660°C for 8 hours in argon, the sample is superconducting with an onset Tc of 80 K.
KeywordsGlass Transition Temperature Exothermic Peak Super Conducting Copper Cation Glass Crystallization
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