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Related Concept Videos

Third Law of Thermodynamics02:38

Third Law of Thermodynamics

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A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
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Metallic Solids02:37

Metallic Solids

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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.
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
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Classification of Elements and Compounds02:54

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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Valence Bond Theory

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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...
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One-Dimensional High-Entropy Compounds.

Junyi Du1, Shuai Liu1, Ye Liu1

  • 1Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Advanced Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.

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|March 14, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to synthesize one-dimensional (1D) high-entropy compounds (HECs). This breakthrough enables the creation of novel 1D high-entropy metal phosphide (HEP) materials with enhanced properties and stability.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • One-dimensional (1D) high-entropy compounds (HECs) offer unique properties due to electron delocalization.
  • Synthesizing subnano-diameter 1D HECs is challenging, and their properties are not well understood.

Purpose of the Study:

  • To develop a scalable synthesis method for 1D HECs.
  • To investigate the structure and properties of synthesized 1D high-entropy metal phosphides (HEPs).

Main Methods:

  • A comelting-filling-freezing-modification (co-MFFM) method was employed.
  • Simultaneous encapsulation of various metal cations within single-walled carbon nanotubes (SWCNTs).
  • Subsequent phosphorization process to form 1D HEP nanowires within SWCNTs.

Main Results:

  • Successfully synthesized ultrafine, high-entropy, amorphous 1D HEP nanowires within SWCNTs.
  • The core-shell structure features SWCNTs donating π electrons and providing protection.
  • Achieved enhanced electron delocalization, high electrocatalytic activity, and improved stability.

Conclusions:

  • The co-MFFM method is effective for synthesizing 1D HEPs with superior characteristics.
  • The SWCNT shell enhances the performance of 1D HEPs.
  • The method is scalable and applicable to synthesizing diverse 1D HECs.