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Related Concept Videos

Properties of Transition Metals02:58

Properties of Transition Metals

29.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.8K
Phase Transitions02:31

Phase Transitions

23.2K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.2K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

8.7K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.7K
Bonding in Metals02:32

Bonding in Metals

52.4K
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”. 
52.4K
Metallic Solids02:37

Metallic Solids

20.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.6K
Alkali Metals03:06

Alkali Metals

24.6K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.6K

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Ag5U(PS4)3: A Transition-Metal Actinide Phosphochalcogenide.

Adel Mesbah1,2, Jai Prakash1,3, Sébastien Lebègue4

  • 1Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston 60208-3113 , Illinois , United States.

Inorganic Chemistry
|December 12, 2018
PubMed
Summary

A novel silver-uranium thiophosphate, Ag5U(PS4)3, was synthesized and characterized. Density functional theory revealed unique spin polarization, with two uranium magnetic moments aligning parallel and one antiparallel.

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Area of Science:

  • Solid-state chemistry
  • Inorganic materials science
  • Crystallography

Background:

  • Exploration of novel materials with unique structural and electronic properties is crucial for advancing materials science.
  • Actinide-containing compounds offer complex electronic structures and potential for diverse applications.
  • The MAnPQ (M = transition metal, An = actinide, Q = S, Se, or Te) structure type was previously unexplored.

Purpose of the Study:

  • To synthesize and determine the crystal structure of a novel silver-uranium thiophosphate compound.
  • To investigate the structural characteristics and bonding within the new material.
  • To explore the electronic and magnetic properties using computational methods.

Main Methods:

  • Synthesis via standard solid-state methods at 1123 K.
  • Single-crystal X-ray diffraction for structure determination at 100(2) K.
  • Density functional theory (DFT) calculations for electronic structure and spin polarization analysis.

Main Results:

  • A new structure type, Ag5U(PS4)3, was discovered, crystallizing in space group P3221 (trigonal system).
  • The structure features bicapped trigonal prismatic coordination for U atoms and tetrahedral coordination for P atoms.
  • DFT calculations indicated asymmetric total density of states with finite spin polarization and complex magnetic ordering of U atoms.

Conclusions:

  • Ag5U(PS4)3 represents a unique structural motif previously unreported in the MAnPQ family.
  • The compound exhibits intricate structural features involving U, P, and Ag atoms coordinated by sulfur.
  • The calculated spin polarization suggests interesting magnetic behavior in this novel actinide material.