【摘要】：采用傳統(tǒng)固相法制備了平均晶粒尺寸為5μm的四方結(jié)構(gòu)摻鑭鋯鈦酸鉛(PLZT)鐵電陶瓷,在其表面涂銀、切向預(yù)極化后刻蝕出刻槽,在刻槽表面壓出維氏壓痕并沿預(yù)極化方向施加外電場(chǎng),利用Raman光譜原位觀測(cè)了壓痕裂紋尖端附近不同位置的疇變,分析了Raman軟模E(2TO)和E(3TO+2LO)+B1峰的強(qiáng)度隨觀測(cè)點(diǎn)的變化規(guī)律。結(jié)果表明:在外電場(chǎng)作用下,裂紋尖端會(huì)發(fā)生電致應(yīng)變和90°疇變;Raman譜和軟模E(2TO)、E(3TO+2LO)+B1峰強(qiáng)度均會(huì)隨著觀測(cè)點(diǎn)距裂紋尖端距離的增大而減弱。
[Abstract]:The tetragonal (PLZT) ferroelectric ceramics with average grain size of 5 渭 m were prepared by conventional solid state method. Silver was coated on the surface of the ceramics, and the grooves were etched after tangential prepolarization. Vickers indentation was indented on the surface of the groove and applied an external electric field along the prepolarization direction. The domain switching near the crack tip of the indentation was observed in situ by Raman spectroscopy. The variation of the intensity of E (2TO) and E (3TO 2LO) B1 peaks with the observed point is analyzed. The results show that the electric strain and 90 擄domain switching will occur at the crack tip under the external electric field, and both the Raman spectrum and the soft mode E (2TO), E (3TO 2LO) B1 peak intensity will decrease with the increase of the distance from the observation point to the crack tip.
【作者單位】： 廈門大學(xué)材料學(xué)院 福建省特種先進(jìn)材料重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51302236) 福建省自然科學(xué)基金資助項(xiàng)目(2014J01205)
【分類號(hào)】：TQ174.1

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