Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

21.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
21.5K
Ferromagnetism01:31

Ferromagnetism

3.6K
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...
3.6K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

55.7K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
55.7K
Valence Bond Theory02:42

Valence Bond Theory

11.9K
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...
11.9K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

27.6K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
27.6K
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

94
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
94

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Characteristics of gut microbiota structure and composition in diabetic patients from the Chaoshan region of China.

Journal of medical microbiology·2026
Same author

Na<b><sup>+</sup></b> Solvation and Association in Na(SO<sub>3</sub>CF<sub>3</sub>)-Dimethoxyethane Electrolytes by Large-Angle X-Ray Scattering and DFT Calculations.

The journal of physical chemistry. B·2026
Same author

Amorphous High-Entropy Oxides With High-Valent Metal and Oxygen-Vacancy Pairs for Thermally Stable Catalytic Oxidation.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Superior Selective and Fast NH<sub>3</sub> Adsorption of Soft Porous MOF/Ionic Liquid Composites with Ordering Phase Transitions.

Journal of the American Chemical Society·2026
Same author

Perioperative central retinal artery occlusion after prone posterior cervical spine surgery treated with delayed hyperbaric oxygen therapy: a case report and targeted literature review.

BMC anesthesiology·2026
Same author

Quenching-Induced Octahedral Fe Vacancies in CoFe Spinel Nanosheets for Boosted Oxygen Evolution.

Small (Weinheim an der Bergstrasse, Germany)·2026

Related Experiment Video

Updated: Apr 15, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

8.7K

Anion Order Triggered Janus Ferroelectricity in Chalcogenides.

Zhiguo Li1, Qiang Li1, Jinpeng Cao1

  • 1Institute of Solid State Chemistry, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, China.

Advanced Materials (Deerfield Beach, Fla.)
|April 14, 2026
PubMed
Summary

Janus ferroelectricity was achieved in SnSSe nanobelts through anion ordering, exhibiting switchable polarization and a high Curie temperature. This breakthrough enables potential applications in novel memory and optoelectronic devices.

Keywords:
anion orderhigh Curie temperaturejanus ferroelectricitytin chalcogenidesvan der Waals materials

More Related Videos

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
10:42

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

11.3K
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

9.3K

Related Experiment Videos

Last Updated: Apr 15, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

8.7K
Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
10:42

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

11.3K
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

9.3K

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • 2D Janus structures exhibit unique properties due to broken mirror symmetry.
  • Anion-ordered Janus structures are promising for ferroelectric materials, but thermodynamic stability favors disordered alloys.
  • Previous anion-ordered Janus structures lacked switchable polarization, hindering ferroelectric applications.

Purpose of the Study:

  • To achieve anion order-triggered ferroelectricity in van der Waals materials.
  • To investigate Janus ferroelectricity in SnS0.6Se0.4 nanobelts.
  • To explore the potential of these materials for novel electronic and optoelectronic devices.

Main Methods:

  • Synthesis of SnS0.6Se0.4 nanobelts.
  • Characterization using second-harmonic generation (SHG) microscopy.
  • Confirmation of switchable spontaneous polarization via piezoelectric force microscopy (PFM).

Main Results:

  • S/Se ordering induced Janus ferroelectricity in SnS0.6Se0.4 nanobelts with a Curie temperature of ~600 K.
  • The SHG intensity of SnS0.6Se0.4 nanobelts was ~300 times greater than that of SnS nanobelts.
  • Switchable spontaneous polarization was confirmed, demonstrating the first anion-ordered Janus ferroelectricity.

Conclusions:

  • Anion ordering in SnS0.6Se0.4 nanobelts leads to a phase transition from non-ferroelectric Pnma to ferroelectric Pm.
  • This work realizes a periodically anion-ordered Janus structure with ferroelectricity in van der Waals materials.
  • The developed material is a candidate for non-volatile memory and optoelectronic applications.