Accession Number:

AD0291651

Title:

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

Descriptive Note:

Corporate Author:

CALIFORNIA INST OF TECH PASADENA W M KECK LAB OF ENGINEERING MATERIALS

Personal Author(s):

Report Date:

1962-10-01

Pagination or Media Count:

1.0

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 volumeatom 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

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE