Large pyroelectric response in relaxor-based ferroelectric (1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3 single crystals
Large pyroelectric response in relaxor-based ferroelectric (1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3 single crystals
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DOI：
10.1063/1.2106014
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发表时间：
2005-10
影响因子：
3.2
通讯作者：
Yanxue Tang;X. Wan;Xiangyong Zhao;X. Pan;D. Lin;Haosu Luo;Jinglan Sun;Xiangjian Meng;J. Zhu
中科院分区：
文献类型：
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作者：
Yanxue Tang;X. Wan;Xiangyong Zhao;X. Pan;D. Lin;Haosu Luo;Jinglan Sun;Xiangjian Meng;J. Zhu
研究了（1−x）Pb(Mg1∕3Nb2∕3)O3-xPbTiO3 （PMN-xPT）单晶在0.13≤x≤0.40范围内的热释电性质。在⟨111⟩取向的PMN-0.26PT单晶中实现了最佳的热释电性能。在室温下，电压响应度和检出率的优值分别达到0.11m2∕C和15.3×10−5Pa−1∕2。这些性能优于已广泛应用于器件应用的传统热释电陶瓷。PMN-0.26PT单晶还具有相对较高的居里温度（~ 120°C）和较低的热扩散率（~ 4.4×10−7m2∕s）。此外，PMN-xPT （x大于或等于0.26）单晶的热电性质弱依赖于温度，并且在20-55°C的实验温度范围和50-10000Hz的频率范围内几乎与频率无关。单晶优异的热释电性能使其成为高性能非冷却红外探测器的理想选择。
The pyroelectric properties of (1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3 (PMN–xPT) single crystals have been investigated over a broad composition range of 0.13⩽x⩽0.40. The best pyroelectric performances are achieved in ⟨111⟩-oriented PMN–0.26PT single crystal. At room temperature, the figures of merit for voltage responsivity and detectivity reach up to 0.11m2∕C and 15.3×10−5Pa−1∕2, respectively. These properties are superior to those of conventional pyroelectric ceramics that have been widely used in device applications. PMN–0.26PT single crystal also possesses a relative high Curie temperature (∼120°C) and a low thermal diffusivity (∼4.4×10−7m2∕s). Furthermore, the pyroelectric properties of PMN–xPT (x⩾0.26) single crystals are weak dependent on temperature and nearly independent of frequency in the experimental temperature range of 20–55°C and frequency range of 50–10000Hz. The superior pyroelectric performances of the single crystal make it a promising candidate for high-performance uncooled infrared detectors a...