Aging of Barium Titanate and Lead Zirconate-Titanate Ferroelectric Ceramics

摘要

The report reviews the present knowledge of the aging process in barium titanate and lead zirconate-titanate ferroelectric ceramics. By 'aging' is meant the passive change in the mechanical and electrical properties of a ferroelectric with time. Experimental data show that these constants vary linearly with the logarithm of time. The Smith, Street and Woolley, and Plessner theories for this logarithmic dependence are revised to remove some of the obscurity in the usual derivation. The experimental evidence of Ikegami and Ueda and of Bradt and Ansell, which is described in some detail, supports the hypothesis that aging is associated with the relief of internal stress through the formation of 90 deg-domains. (Author)