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Related Concept Videos

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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...
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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.
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The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
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Guest-cage atomic interactions in a clathrate-based phase-change material.

Desmond Loke1, Jonathan M Skelton, Leong-Tat Law

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK; National University of Singapore (NUS) Graduate School for Integrative Sciences and Engineering, 28 Medical Drive, Singapore, 117456.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

New clathrate materials with cage-like structures and specific guest atoms exhibit controlled crystallization and amorphization. This offers a pathway for developing stable, cage-controlled semiconductor devices with low melting energy.

Keywords:
clathrate compoundscrystallization kineticsguest-cage interactionsnano-engineeringphase-change materials

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Phase-change materials (PCMs) are crucial for data storage and thermal management.
  • Controlling the crystallization and amorphization of PCMs is key to device performance.
  • Clathrate structures offer unique host-guest chemistry for material design.

Purpose of the Study:

  • To engineer novel clathrate-based phase-change materials.
  • To investigate the influence of guest atom incorporation (Cs, Ba) on material properties.
  • To explore the potential for cage-controlled semiconductor devices.

Main Methods:

  • Synthesis of clathrate-based materials incorporating Cesium (Cs) and Barium (Ba) guest atoms.
  • Analysis of 'guest-cage' interactions and their effect on vibrational properties.
  • Evaluation of crystallization resistance, amorphous phase retention, and melting energy.

Main Results:

  • Achieved high resistance to spontaneous crystallization.
  • Demonstrated long retention of the amorphous phase.
  • Observed low melting energy due to controlled guest-cage interactions.

Conclusions:

  • Incorporating specific guest atoms into clathrate structures effectively modulates phase-change behavior.
  • The 'guest-cage' interaction control via vibrational effects is a viable strategy for PCM design.
  • This approach paves the way for advanced cage-controlled semiconductor devices.