Paper Title:
Degradation of Resistance over Time for Multilayer Ceramic Capacitors
  Abstract

The lifetime determination model for multilayer ceramic capacitors (MLCCs) is discussed. The accumulation of oxygen vacancies on the cathode/ceramics interface by an electro-migration process is a concept accepted by many researchers. However, the lifetimes and leakage currents measured during a highly accelerated lifetime test (HALT) could not be explained by this concept. To investigate the mechanism, we used a polarity reversal method during the HALT, which provided information on the dominant process for the leakage current. Thermally stimulated current (TSC) measurement provided the relative number of oxygen vacancies both on the cathode/ceramics interfaces and the grain boundaries. Moreover, the microstructure of the MLCC samples was evaluated by both electric property measurements and direct observation. From these results, we concluded that the grain boundaries controlled the leakage current as well as the lifetime.

  Info
Periodical
Edited by
Shinobu Fujihara and Tadashi Takenaka
Pages
35-38
DOI
10.4028/www.scientific.net/KEM.445.35
Citation
K. Morita, Y. Mizuno, H. Chazono, "Degradation of Resistance over Time for Multilayer Ceramic Capacitors", Key Engineering Materials, Vol. 445, pp. 35-38, 2010
Online since
July 2010
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