Piezoelectricity in Excess of 800 pC/N over 400 °C in BiScO3-PbTiO3-CaTiO3 Ceramics.
Piezoelectricity in Excess of 800 pC/N over 400 °C in BiScO3-PbTiO3-CaTiO3 Ceramics.
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DOI：
10.1021/acsami.1c07492
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发表时间：
2021-07
影响因子：
9.5
通讯作者：
Chen Yang;Xijun Xu;Wajid Ali;Yaojin Wang;Yiping Wang;Ying Yang;Lang Chen;G. Yuan
中科院分区：
文献类型：
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作者：
Chen Yang;Xijun Xu;Wajid Ali;Yaojin Wang;Yiping Wang;Ying Yang;Lang Chen;G. Yuan
超声波传感器在室温附近的工业中有着广泛的应用，但由于缺乏高性能的压电陶瓷，其在高温下的应用仍然是一个挑战。在此，0.364BiScO3-0.636PbTiO3-0.005CaTiO3陶瓷在20-440 °C下表现出优异的压电性能。其压电系数d33从20 °C时的475 pC/N增加到360 °C时的853 pC/N，然后逐渐降低到440 °C时的669 pC/N。此外，平面机电耦合因子kp从20 °C时的0.59逐渐增加到200 °C时的0.67，然后在150-350 °C时保持在0.65-0.67的稳定值。这是因为陶瓷准同型相界具有平坦的吉布斯自由能-极化曲线和较宽的温度范围。由于压电陶瓷在20-440 °C下表现出令人满意的压电性能，因此相应的超声波传感器可以原位监测许多高温设备，如发动机，车轮，钻头，锅炉等。
Ultrasonic sensors are widely applied in industries near room temperature; however, their application at high temperature is still a challenge mainly due to the lack of high-performance piezoelectric ceramics. Here, the 0.364BiScO3-0.636PbTiO3-0.005CaTiO3 ceramic exhibits excellent piezoelectric performances at 20-440 °C. Its piezoelectric coefficient d33 increases from 475 pC/N at 20 °C to 853 pC/N at 360 °C, and then it gradually decreases to 669 pC/N at 440 °C. Furthermore, the planar electromechanical coupling factor kp gradually increases from 0.59 at 20 °C to 0.67 at 200 °C, and then it remains at a stable value of 0.65-0.67 at 150-350 °C. These achievements are because the ceramic morphotropic phase boundaries have a flat Gibbs free energy versus polarization curve and a wide temperature range. Since the piezoelectric ceramic shows satisfactory piezoelectric properties at 20-440 °C, the corresponding ultrasonic sensors can in situ monitor many high-temperature devices, such as engines, wheels, drills, boilers, etc.