首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Harmonic analysis of the polarization response in Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-based ceramics-A study in aging
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Harmonic analysis of the polarization response in Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-based ceramics-A study in aging

机译:基于Pb(Mg / sub 1/3 / Nb / sub 2/3 /)O / sub 3 /的陶瓷极化响应的谐波分析-时效研究

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摘要

The polarization response of a ferroelectric ceramic displays nonlinear behavior at high applied fields due to saturation effects. Weak-field dielectric aging imposes additional nonlinearity on the hysteresis loops of these materials. Harmonic analysis using a discrete Fourier transform (DFT) permitted an observation of the change in the polarization frequency spectrum as Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-based relaxor ceramics aged. It also facilitated the calculation of ac current, power, and "internal bias field". The results show that particular harmonics in the polarization signal are sensitive indications of aging behavior. The average power dissipated at weak ac fields was found to decrease with aging time; and the power dissipated at strong fields tended to increase.
机译:由于饱和效应,铁电陶瓷的极化响应在高电场下显示出非线性行为。弱场介电老化会在这些材料的磁滞回线上施加额外的非线性。使用离散傅里叶变换(DFT)进行谐波分析,可以观察到随着Pb(Mg / sub 1/3 / Nb / sub 2/3 /)O / sub 3 /型弛豫陶瓷老化,极化频谱的变化。它还简化了交流电流,功率和“内部偏置场”的计算。结果表明,极化信号中的特定谐波是老化行为的敏感指示。发现在弱交流电场下的平均功耗随老化时间而降低;并且在强磁场下的功耗趋于增加。

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