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Inch-Size Molecular Ferroelectric Crystal with a Large Electromechanical Coupling Factor on Par with Barium Titanate
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2022-11-25 , DOI: 10.1021/jacs.2c11213 Hui-Peng Lv 1 , Wei-Qiang Liao 1 , Yu-Meng You 2 , Ren-Gen Xiong 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2022-11-25 , DOI: 10.1021/jacs.2c11213 Hui-Peng Lv 1 , Wei-Qiang Liao 1 , Yu-Meng You 2 , Ren-Gen Xiong 1
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Molecular ferroelectrics with large piezoelectric responses have long been sought for their advantages of light weight, mechanical flexibility, and easy preparation, in contrast to the widely used inorganic counterparts. Representatively, a molecular ferroelectric crystal [Me3NCH2Cl]CdCl3 (TMCM-CdCl3) has been found to show a large piezoelectric coefficient d33 of 220 pC/N exceeding that of BaTiO3 (You et al. Science2017, 357, 306–309). However, although the d33 of molecular ferroelectrics has achieved great progress, their electromechanical coupling factor k33, which is essential for various piezoelectric applications, including ultrasonic transducers and actuators, was rarely explored and is far below the level of inorganic ferroelectrics. The major reason for this situation is the great challenge of growing large-size crystals which is a key limiting factor for measuring k33. Here, we grew inch-size crystals of organic–inorganic perovskite ferroelectric TMCM-CdCl3 with a high d33 (383 pC/N) for investigating its piezoelectric responses including the k33 (0.483) by the resonance method. Such high k33 (0.483) is much larger than those of other molecular ferroelectrics and competitive with that of BaTiO3 (0.5). In addition, TMCM-CdCl3 has a low elastic modulus of 13.03 GPa, an order of magnitude lower than that of BaTiO3. This finding sheds light on the exploration of large electromechanical coupling factors in molecular ferroelectrics for potential applications in flexible and portable piezoelectric devices.
中文翻译：
具有与钛酸钡相当的大机电耦合系数的英寸尺寸分子铁电晶体
与广泛使用的无机对应物相比，长期以来，人们一直在寻找具有大压电响应的分子铁电体，因为它们具有重量轻、机械柔韧性好和易于制备等优点。代表性地，已发现分子铁电晶体 [Me 3 NCH 2 Cl]CdCl 3 (TMCM-CdCl 3 ) 显示出超过 BaTiO 3的 220 pC/N 的大压电系数d 33 (You et al. Science 2017，357、306–309）。然而，虽然分子铁电体的d 33取得了长足的进步，但其机电耦合因子k 33是各种压电应用所必需的，包括超声波换能器和致动器，很少被探索并且远低于无机铁电体的水平。造成这种情况的主要原因是生长大尺寸晶体的巨大挑战，这是测量k 33的关键限制因素。在这里，我们生长了具有高d 33 (383 pC/N)的有机-无机钙钛矿铁电体 TMCM-CdCl 3的英寸尺寸晶体，用于通过共振方法研究其压电响应，包括k 33 (0.483)。这么高的k 33(0.483) 远大于其他分子铁电体，与 BaTiO 3 (0.5) 具有竞争力。此外，TMCM-CdCl 3具有13.03 GPa的低弹性模量，比BaTiO 3低一个数量级。这一发现揭示了分子铁电体中大机电耦合因子在柔性和便携式压电设备中潜在应用的探索。
更新日期：2022-11-25
中文翻译：
具有与钛酸钡相当的大机电耦合系数的英寸尺寸分子铁电晶体
与广泛使用的无机对应物相比，长期以来，人们一直在寻找具有大压电响应的分子铁电体，因为它们具有重量轻、机械柔韧性好和易于制备等优点。代表性地，已发现分子铁电晶体 [Me 3 NCH 2 Cl]CdCl 3 (TMCM-CdCl 3 ) 显示出超过 BaTiO 3的 220 pC/N 的大压电系数d 33 (You et al. Science 2017，357、306–309）。然而，虽然分子铁电体的d 33取得了长足的进步，但其机电耦合因子k 33是各种压电应用所必需的，包括超声波换能器和致动器，很少被探索并且远低于无机铁电体的水平。造成这种情况的主要原因是生长大尺寸晶体的巨大挑战，这是测量k 33的关键限制因素。在这里，我们生长了具有高d 33 (383 pC/N)的有机-无机钙钛矿铁电体 TMCM-CdCl 3的英寸尺寸晶体，用于通过共振方法研究其压电响应，包括k 33 (0.483)。这么高的k 33(0.483) 远大于其他分子铁电体，与 BaTiO 3 (0.5) 具有竞争力。此外，TMCM-CdCl 3具有13.03 GPa的低弹性模量，比BaTiO 3低一个数量级。这一发现揭示了分子铁电体中大机电耦合因子在柔性和便携式压电设备中潜在应用的探索。
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