HEXAGONAL CLOSE-PACKED STRUCTURES IN BI-PB ALLOYS AND THE POLYMORPHISM OF LEAD AT HIGH PRESSURE

Abstract

Lattice spacings were obtained for the hexagonal close-packed structures in lead alloys containing 27.0 to 32.0 at .% bismuth, which were rapidly cooled from the melt. Axial ratios for these structures vary from 1.653 to 1.654. By extrapolation to pure lead of these volume/atom determinations and of some activity data, the free energy of hexagonal close-packed lead relative to the face-centered cubic form is estimated. It is suggested that the structure of the lead polymorph stable at pressures greater than 0.16 Mbar is hexagonal close-packed. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1962
Accession Number
AD0291651

Entities

People

  • W. Jr. Klement

Organizations

  • California Institute of Technology

Tags

DTIC Thesaurus Topics

  • Alloys
  • Crystal Structure
  • Energy
  • Extrapolation
  • Free Energy
  • High Pressure
  • Lead Alloys

Readers

  • Materials Science and Engineering.

Technology Areas

  • Space