Related Experiment Video
Updated: Nov 26, 2025
07:24
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
18.1K
Novel Strongly Correlated Europium Superhydrides
Dmitrii V Semenok1, Di Zhou2, Alexander G Kvashnin1
1Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Bolshoy Boulevard 30, bld. 1, Moscow 143026, Russia.
The Journal of Physical Chemistry Letters
|December 9, 2020
Summary
Researchers discovered new magnetic europium superhydrides under high pressure. These materials, including cubic and hexagonal EuH9 and a clathrate phase, exhibit unique magnetic properties and stability influenced by atomic radius.
Area of Science:
- Materials Science
- High-Pressure Physics
- Solid-State Chemistry
Background:
- Europium polyhydrides are of interest for their potential unique electronic and magnetic properties.
- Understanding their behavior under extreme pressure is crucial for discovering novel materials.
Purpose of the Study:
- To investigate the high-pressure chemistry and properties of europium polyhydrides.
- To discover and characterize novel magnetic europium superhydrides.
Main Methods:
- Joint experimental-theoretical investigation at 86-130 GPa.
- Density Functional Theory with DFT+U approach.
- Monte Carlo simulations for magnetic ordering.
Main Results:
- Discovery of cubic EuH9, hexagonal EuH9, and cubic Eu8H46 (Pm3n clathrate).
- Observed magnetic ordering: antiferromagnetic in cubic EuH9 (up to 24 K), ferromagnetic in hexagonal EuH9 (137 K) and Eu8H46 (336 K).
- Weak electron-phonon interaction, excluding s-wave superconductivity except possibly in distorted pseudohexagonal EuH9.
Conclusions:
- Anharmonic effects stabilize novel magnetic Eu superhydrides.
- Atomic radius significantly influences crystal structure distortions and thermodynamic stability.
- High-pressure synthesis opens avenues for new magnetic materials.
More Related Videos
Related Concept Videos
03:02Colors and Magnetism
13.0K
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...
13.0K
02:58Crystal Field Theory - Octahedral Complexes
29.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
29.2K
02:42Valence Bond Theory
10.3K
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...
10.3K
02:52Stereoisomerism
13.2K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
13.2K
02:34Structural Isomerism
20.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
20.8K
02:51Metal-Ligand Bonds
23.0K
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...
23.0K