University of Illinois Urbana-Champaign

Quenching and annealing of lattice vacancies in pure lead

Knodle, Walter St. Clare

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Description

Title
Quenching and annealing of lattice vacancies in pure lead
Author(s)
Knodle, Walter St. Clare
Issue Date
1976
Doctoral Committee Chair(s)
Koehler, James S.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • lattice vacancie
  • pure lead
  • quenching
  • annealing
  • low-pressure helium atmosphere
Language
en
Abstract
Lead (99.9999% pure by weight) wires were quenched.in a low temperature (s35 K), low-pressure (10-100 bars absolute) helium atmosphere. Initial quench rates were between 1 and 3X10 4 °C/sec. The formation energy for a lattice vacancy was determined to be 0.54+0.02 eV and the resistivity for one atomic percent vacancies was found to be 2.8+0.1 po-cm. Annealing studies indicated that the vacancy behavior of lead is similar to other face-centered-cubic metals. Two annealing stages are observed. One stage near 170 K is attributed to the migration of vacancy type defects to clusters. A second stage at 330 K is associated with the dissolution of vacancy clusters and vacancy loops. Slope change measurements made at 140 K and 150 K indicate a divacancy migration energy of 0.45±0.04 eVe Anneals at 269 K and 322 K indicate a strong influence from impurities. A divacancy binding energy of 0.23+0.03eV is found. Good agreement with defect equilibrium concentration measurements and self-diffusion data is achieved.
Type of Resource
text
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http://hdl.handle.net/2142/25665
Copyright and License Information
1976 Walter St. Clare Knodle III

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