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Factors determining the average atomic volumes in intermetallic compounds.

L Pauling1

  • 1Linus Pauling Institute of Science and Medicine, 440 Page Mill Road, Palo Alto, CA 94306.

Proceedings of the National Academy of Sciences of the United States of America
|July 1, 1987
PubMed
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Metallic compounds typically shrink in volume. Electron transfer and atomic packing differences explain the volume contraction in intermetallic compounds, influencing their properties.

Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Physics

Background:

  • Formation of intermetallic compounds from elementary metals often results in volume contraction.
  • Understanding the factors governing this volume change is crucial for predicting material properties.

Purpose of the Study:

  • To explain the significant range of volume contraction observed in different intermetallic compounds within the same binary system.
  • To elucidate the roles of electron transfer and atomic packing in intermetallic compound formation.

Main Methods:

  • Analysis of electron transfer mechanisms and resulting charge states (M(+) and M(-)).
  • Evaluation of valence changes and their correlation with volume.
  • Consideration of atomic radii and packing efficiency in different-sized atoms.

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Main Results:

  • Electron transfer leading to ionic states and increased valence significantly contributes to volume decrease.
  • The observed >2-fold range in contraction is explained by variations in electron transfer and valence.
  • Atomic packing of dissimilar-sized atoms also plays a role in the overall volume contraction.

Conclusions:

  • Volume contraction in intermetallic compounds is a complex phenomenon driven by both electronic (electron transfer, valence) and structural (atomic packing) factors.
  • These factors collectively determine the final volume and properties of the intermetallic phase.