Related Experiment Video
Updated: Jul 25, 2025
10:40
A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
8.3K
Morphotropic Phase Boundary in Polarized Organic Piezoelectric Materials
Fangfang Gao1,2, Xuan Zhao1,2, Xiaochen Xun1,2
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.
Physical Review Letters
|June 30, 2023
Summary
Researchers discovered a morphotropic phase boundary (MPB) in polarized piezoelectric polymers (PVTC-PVT), achieving a giant piezoelectric coefficient and a record figure of merit for enhanced performance.
Area of Science:
- Materials Science
- Polymer Science
- Piezoelectric Materials
Background:
- High piezoelectric performance in materials is often achieved by designing the morphotropic phase boundary (MPB).
- However, an MPB has not been previously identified in polarized organic piezoelectric materials.
Purpose of the Study:
- To discover an MPB in polarized organic piezoelectric materials.
- To demonstrate a mechanism for inducing MPB using tailored intermolecular interactions.
- To achieve high piezoelectric performance in polymer alloys.
Main Methods:
- Investigated polarized piezoelectric polymer alloys (PVTC-PVT).
- Identified biphasic competition between β and 3/1-helical phases.
- Utilized compositionally tailored intermolecular interactions to induce MPB.
Main Results:
- Discovered an MPB in PVTC-PVT, characterized by biphasic competition.
- Achieved a giant quasistatic piezoelectric coefficient exceeding 32 pC/N.
- Obtained a record-high figure of merit for piezoelectricity modulus (~176 pC/(N·GPa)) with a low Young's modulus (182 MPa).
Conclusions:
- The discovery of MPB in PVTC-PVT opens new avenues for organic piezoelectric materials.
- Tailored intermolecular interactions are effective in inducing MPB and enhancing piezoelectric properties.
- PVTC-PVT demonstrates superior piezoelectric performance, surpassing existing materials.
More Related Videos
Related Concept Videos
01:29Potential Due to a Polarized Object
439
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
439
01:31Dielectric Polarization in a Capacitor
4.8K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.8K
01:28Induced Electric Dipoles
4.3K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.3K
01:27π Electron Effects on Chemical Shift: Overview
1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K