INVESTIGADORES
ALDAO celso Manuel
artículos
Título:
Different Degradation Processes in ZnO Varistors
Autor/es:
M.S. CASTRO; C.M. ALDAO
Revista:
CERAMICS INTERNATIONAL
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 1996 vol. 22 p. 39 - 43
ISSN:
0272-8842
Resumen:
Degradation of ZnO-based varistors has been attributed to ion migration in the depletion layers at intergrains. Experiments can then be explained as the result of the deformation of Schottky barriers present in the grain boundaries. However, the simple lowering of the barriers is not consistent with the observed results. We found that ion migration can change the dopant profile and then the barriers? shape. We found it necessary to distinguish two processes, permanent degradation and reversible degradation to account for the observed experimental results.
