Morphotropic Phase Boundary in Polarized Organic Piezoelectric Materials

Fangfang Gao, Xuan Zhao, Xiaochen Xun, Houbing Huang, Xiaoming Shi, Qi Li, Fang Liu, Peng Gao, Qingliang Liao, and Yue Zhang

Phys. Rev. Lett. 130, 246801 – Published 13 June 2023

Abstract

Designing the morphotropic phase boundary (MPB) has been the most sought-after approach to achieve high piezoelectric performance of piezoelectric materials. However, MPB has not yet been found in the polarized organic piezoelectric materials. Here, we discover MPB with biphasic competition of $β$ and $3 / 1$ -helical phases in the polarized piezoelectric polymer alloys (PVTC-PVT) and demonstrate a mechanism to induce MPB using the compositionally tailored intermolecular interaction. Consequently, PVTC-PVT exhibits a giant quasistatic piezoelectric coefficient of $> 32 pC / N$ while maintaining a low Young’s modulus of 182 MPa, with a record-high figure of merit of piezoelectricity modulus of about $176 pC / (N \cdot GPa)$ among all piezoelectric materials.

Received 8 December 2022
Accepted 17 May 2023

DOI:https://doi.org/10.1103/PhysRevLett.130.246801

Physics Subject Headings (PhySH)

Dielectric properties Ferroelectricity Phase transitions Piezoelectricity

Crystal phenomena Dielectric spectroscopy Differential thermal analysis First-principles calculations Infrared spectroscopy Phase-field modeling Tension tests X-ray diffraction

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Fangfang Gao ^1,2,*, Xuan Zhao^1,2,*, Xiaochen Xun^1,2,*, Houbing Huang³, Xiaoming Shi³, Qi Li^1,2, Fang Liu⁴, Peng Gao⁴, Qingliang Liao^1,2,†, and Yue Zhang ^1,2,‡

¹Academy for Advanced Interdisciplinary Science and Technology, Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
²Beijing Key Laboratory for Advanced Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
³Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China
⁴Electron Microscopy Laboratory and International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China

^*These authors contributed equally to this work.
^†Corresponding author. liao@ustb.edu.cn
^‡Corresponding author. yuezhang@ustb.edu.cn

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Issue

Vol. 130, Iss. 24 — 16 June 2023

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