Being the fatigue life test manner which measures the fatigue property which accompanies

摘要

PROBLEM TO BE SOLVED: To perform a fatigue life test in a short time even in a ferroelectric material with a long reversing fatigue life so as to easily predict a fatigue life of the material by regressing a function of reduction ratio of a residual polarization value of the material by a straight line as a function of a reversing frequency of polarization reversing pulse and extrapolating the straight line so as to predict a fatigue life of the material. ;SOLUTION: After polarization reversing pulse voltages, which are N in number, are impressed between the electrodes of a capacitor 1 formed of ferroelectric material, a residual polarization value Q is measured, and this measurement is repeated while increasing the reversing number N gradually. These measurement results are plotted as a function of a reduction ratio of a residual polarization value Q while using a lateral axis for a logarithm of the reversing number N and using a vertical axis for the reduction ratio of the vesidual polarization value Q. Using the obtained regressing line, a polarization reversing life of the ferroelectric material can be predicted. For example, a life for the residual polarization value Q with a reduction ratio of 20% can be easily predicted on the basis of the data for a far lower reduction ratio of the value Q. Therefore, a life can be predicted by means of the measurement in a short time.;COPYRIGHT: (C)1999,JPO