Related Experiment Video
Updated: May 1, 2026
11:07
Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
9.6K
A Molecular Perovskite with Switchable Coordination Bonds for High-Temperature Multiaxial Ferroelectrics
Wei-Jian Xu1, Peng-Fei Li2, Yuan-Yuan Tang2
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University , Guangzhou 510275, China.
Journal of the American Chemical Society
|April 13, 2017
Summary
Researchers designed a novel molecular perovskite, TMC-1, exhibiting multiaxial ferroelectricity via bond-switching. This discovery offers a new pathway for advanced ferroelectric materials and flexible electronics.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Ferroelectric mechanisms in molecular crystals typically involve order-disorder or displacive transitions, without chemical bond breaking.
- Existing ferroelectric materials often have limitations in their number of ferroelectric directions or fabrication complexity.
Purpose of the Study:
- To demonstrate a designable bond-switching ferroelectric mechanism in molecular crystals.
- To introduce a novel molecular perovskite, TMC-1, with multiaxial ferroelectric properties.
- To explore the potential of TMC-1 for next-generation flexible electronics.
Main Methods:
- Synthesis and characterization of the molecular perovskite [(CH3)3NOH]2[KFe(CN)6] (TMC-1).
- Fabrication of high-quality TMC-1 thin films using a solution process.
- Investigation of ferroelectric properties at macroscopic and microscopic scales.
Main Results:
- TMC-1 exhibits a bond-switching transition under ambient pressure, a novel ferroelectric mechanism.
- TMC-1 displays multiaxial ferroelectricity with 24 equivalent ferroelectric directions and a high Curie temperature of 402 K.
- High-quality TMC-1 thin films show excellent ferroelectric properties, suitable for device applications.
Conclusions:
- The bond-switching mechanism in TMC-1 opens new avenues for designing advanced ferroelectric materials.
- TMC-1 is a promising candidate for next-generation flexible electronics due to its unique properties and facile fabrication.
- The molecular assembly strategy provides a new approach for tailoring ferroelectric functionalities.
More Related Videos
Related Concept Videos
02:32Bonding in Metals
45.5K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
45.5K
02:51Metal-Ligand Bonds
19.3K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
19.3K
02:42Valence Bond Theory
8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.9K
03:02Colors and Magnetism
12.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.1K
01:28Types Of Superconductors
1.7K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.7K
01:31Ferromagnetism
2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.8K