Related Experiment Video
Updated: Aug 14, 2026
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Ferroelectric Martensitic Actuation in Single Crystal through Molecular Geometry Engineering
Lian-Jie Wu1, Lei Pan2, Hao-Fei Ni2
1Ordered Matter Science Research Center, Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing211189, People's Republic of China.
Researchers developed a novel molecular strategy to create a single-phase material exhibiting both martensitic actuation and ferroelectricity. This new hybrid crystal shows significant shape change and robust ferroelectric properties for micro-scale applications.
Area of Science:
- Materials Science
- Crystallography
- Solid-State Physics
Background:
- Martensitic transformations offer potential for microscale actuators due to mechanical responses.
- Ferroelectric materials are promising for transducers and energy harvesting via electromechanical responses.
- Integrating these distinct properties into a single molecular material is challenging.
Purpose of the Study:
- To design and implement a molecular geometry strategy for achieving diffusionless martensitic transformation behaviors.
- To develop a single-phase molecular material combining ferroelectricity and martensitic actuation.
- To explore the potential of such materials in micro-electro-mechanical systems.
Main Methods:
- A molecular geometry strategy was employed by modifying organic cation shapes.
- An organic-inorganic hybrid ferroelectric crystal, (DMAiB)PbI3, was synthesized and characterized.
- Structural, thermal expansion, and ferroelectric properties were investigated.
Main Results:
- The synthesized (DMAiB)PbI3 crystal exhibits reversible actuating behaviors with fast response and giant anisotropic shape change.
- Dynamic disorder of organic cations induces significant displacements of [PbI3]n- chains, leading to a 14.84% macroscopic thermal expansion.
- The material displays robust ferroelectricity with a spontaneous polarization of 9.8 μC/cm2, the highest reported for 1D hybrid lead-based ferroelectrics.
Conclusions:
- A feasible molecular design strategy for martensitic actuating materials has been established.
- The study offers new insights into multifunctional martensitic ferroelectrics.
- (DMAiB)PbI3 shows great potential for versatile micro-electro-mechanical systems.
