PMN-PT单晶的高场性能

Wei Luo, A. Ding, Haosu Luo, Z. Yin
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引用次数: 6

摘要

研究了高场相边界下弛豫铁电Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ (PMN-PT)单晶在菱形-四方转变附近的电学性质。该方向单晶的剩余极化为30 /spl mu/C/cm/sup 2/,矫顽力场为3.5 kV/cm,在9 kV/cm时可切换极化为51 /spl mu/C/cm/sup 2/。晶体的极化温度依赖性表明,在80/spl度/C时,剩余极化降低5%,可切换极化降低3.2%。在146/spl度/C (T/sub m/)时,剩余极化降低到5 /spl mu/C/cm/sup / 2/。然而,在那个温度下,可切换极化降为零。在12 kV/cm的双极脉冲下,在高达2.5/spl次/10/sup 8/次的开关周期中,极化损耗达12%。另一方面,在100/spl度/C和10 kV/cm的电场条件下,晶体的电阻率为1.6/spl times/10/sup 9/ /spl Omega/-cm。这些结果有利于PMN-PT晶体器件设计的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-field properties of PMN-PT single crystals
Electric properties of relaxor ferroelectric Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ (PMN-PT) single crystals near the rhombohedral-tetragonal transition under high-field phase boundary were studied. The single crystals in the <001> direction exhibited a remanent polarization of 30 /spl mu/C/cm/sup 2/, coercive field of 3.5 kV/cm and switchable polarization of 51 /spl mu/C/cm/sup 2/ at 9 kV/cm. The polarization-temperature dependence of the crystals indicated a reduction of 5% in the remanent polarization and 3.2% in switchable polarization at 80/spl deg/C. The remanent polarization decreased to 5 /spl mu/C/cm/sup 2/ at 146/spl deg/C (T/sub m/). However the switchable polarization fell to zero at that temperature. A loss of 12% in the polarization was observed in the switching cycles up to 2.5/spl times/10/sup 8/ reversals under bipolar pulse of 12 kV/cm. On the other hand, the crystals have a resistivity of 1.6/spl times/10/sup 9/ /spl Omega/-cm at 100/spl deg/C and with a electric field of 10 kV/cm. These results are favorable to applications for device design of the PMN-PT crystals.
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