Abstract
Ceramic materials based in the ZnO- Bi 2 O 3 system have their principal application as varistors. The binary system ZnO-Bi 2 O 3 is specially relevant to the formation of the microstructure responsable of the varistor behaviour. The study of the different equilibrium phases at high temperatures at the Bi 2 O 3 -rich region of the ZnO-Bi 2 O 3 will allow a correct understanding of the microstructural development. Equilibrium phases have been analyzed by XRD, SEM and DTA. Different temperature treatments of samples formulated in the Bi 2 O 3 rich region of the ZnO-Bi 2 O 3 binary system have allowed to determine the phase 19Bi 2 O 3 .ZnO as the equilibrium one instead of the 24Bi 2 O 3 .ZnO phase.
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