Accession Number : AD0291651

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

Corporate Author : CALIFORNIA INST OF TECH PASADENA W M KECK LAB OF ENGINEERING MATERIALS

Personal Author(s) : KLEMENT,W. JR.

Report Date : OCT 1962

Pagination or Media Count : 1

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)

Descriptors :   *BISMUTH ALLOYS, *CRYSTAL LATTICES, *LEAD(METAL), *LEAD ALLOYS, COOLING, CRYSTAL STRUCTURE, HIGH PRESSURE, PROCESSING, SOLIDS, SOLUTIONS(MIXTURES)

Distribution Statement : APPROVED FOR PUBLIC RELEASE