从Raman光散射原理出发, 提出原位Raman谱观测畴变原理, 探索建立铁电畴变的 原位、无损和微区观测技术. 通过对PLZT铁电陶瓷试样的90 deg原位旋 转前、后Raman谱变化的观测, 以及电场作用下PLZT铁电陶瓷试样畴变后Raman谱 峰强变化的观测, 证实可以利用Raman谱的变化来检测铁电陶瓷材料电 畴的畴变.
In order to develop a nondestructive technique observing domain switchings in microscopic scale, an in situ method was proposed based upon the principal of Raman spectroscopy. Two types of experiments were carried out to verify the proposed method. One is to measure the Raman spectra for a fixed grain in the PLZT ferroelectric sample before and after 90 rotation. The other is to observe variations of Raman spectra for a fixed grain under a DC field. The results revealed that by a 90 rotation the Raman spectra for grains in an in-plane polarized sample vary and the Raman spectra for grains in both un-poled and out-plane polarized samples remain unchanged. The results also indicated that the in situ Raman spectrum varies as the magnitude of the applied DC field increases. These results showed that the domain switching will leads to variations of Raman spectrum.
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