Landolt-Börnstein - Group III Condensed Matter

2.1.4.2 Calorimetry (Cal)

Abstract

This chapter discusses on the most characteristic features of the experimental methods that are widely used in the investigation of point defects and their interaction at low temperatures. The experimental methods given in this chapter are residual electrical resistivity and calorimetry. The residual electrical resistivity is proportional to the total concentration of all point defects. Under certain conditions deviations from Matthiessens rule, and for thin specimens also the size effect of the electrical resistivity have to be considered. The resistivity increase per unit irradiation dose is therefore a measure of the concentration of stable defects produced at a given irradiation temperature, and thus damage rates have been determined for many metals by electrical resistivity measurements. Vacancy concentrations at high temperatures have been determined after quenching. Measurements of residual electrical resistivity as a function of annealing temperatures give detailed information on the kinetics of defect reactions. The magnitude of the activation enthalpy of the migrating defects has been determined in many metals by the “change of slope” method. The experimentally determined activation enthalpies can be attributed to the mobile defects as long as the recovery occurs by a unique process. By calorimetry (Cal) method, the release of stored energy due to the recombination of radiation induced Frenkel pairs has been measured for several metals. By combination with the resistivity annealing the defect concentration was determined and the formation energy of Frenkel defects can be determined.

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Title
2.1.4.2 Calorimetry (Cal)
Book Title
Atomic Defects in Metals
In
2.1.4 Experimental methods
Book DOI
10.1007/b37800
Chapter DOI
10.1007/10011948_36
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
25
Editors
  • H. Ullmaier
  • Authors
  • P. Ehrhart
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