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Related Concept Videos

Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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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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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

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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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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Updated: Jun 27, 2025

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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Plutonium oxide melt structure and covalency.

Stephen K Wilke1,2, Chris J Benmore3, Oliver L G Alderman4

  • 1Materials Development, Inc., Arlington Heights, IL, USA. swilke@matsdev.com.

Nature Materials
|April 26, 2024
PubMed
Summary
This summary is machine-generated.

Understanding plutonium dioxide (PuO2-x) behavior at extreme temperatures is crucial for nuclear reactor safety. This study reveals its atomic structure through melting, identifying a structural surrogate for safety modeling.

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Area of Science:

  • Nuclear Materials Science
  • High-Temperature Chemistry
  • Materials Characterization

Background:

  • Mixed oxide fuel (uranium and plutonium oxides) is vital for advanced nuclear reactors.
  • The high-temperature behavior of plutonium dioxide (PuO2-x) above 1,800 K is largely unknown.
  • Understanding these conditions is critical for reactor design and severe accident mitigation.

Purpose of the Study:

  • To investigate the atomic structure of PuO2-x through its melting point up to 3,000 K.
  • To develop structural models for molten PuO2-x using advanced computational methods.
  • To identify potential structural surrogates for PuO2-x in high-temperature studies.

Main Methods:

  • X-ray scattering on laser-heated, aerodynamically levitated PuO2-x samples (O/Pu = 1.57–1.76).
  • Development of liquid structural models using machine-learned interatomic potentials.
  • Application of density functional theory for electronic structure analysis.

Main Results:

  • Atomic structure of PuO2-x characterized through melting up to 3,000 ± 50 K.
  • Molten PuO1.76 exhibits covalent Pu-O bonding, indicated by orbital degeneracy.
  • Molten PuO1.76 is isomorphous with molten cerium dioxide (CeO1.75).

Conclusions:

  • Molten PuO2-x structural data provides essential constraints for nuclear reactor safety modeling.
  • Molten CeO1.75 can serve as a non-radioactive, non-toxic structural surrogate for PuO2-x.
  • The findings advance the understanding of actinide oxide behavior under extreme conditions relevant to nuclear energy.