Landolt-Börnstein - Group III Condensed Matter

2.4.1 Special remarks

Abstract

This chapter discusses special remarks about defect properties in the hcp metals. The main complication with hcp metals arises from two sources: (i) the purity of the metals: similar to some bcc metals, there is for many hcp metals a high solubility of interstitial impurities like hydrogen or oxygen, and (ii) the anisotropic structure: thermal annealing experiments are affected by the anisotropic thermal expansion and the consequent plastic deformation during thermal cycling of polycrystalline samples; therefore single crystalline samples are necessary for many hcp metals. The structure and the migration energy of the SIA seem to depend on the c/a ratio of the hcp metals. Correlation of the temperature for the onset of the long-range migration of self-interstitial atoms with the deviation of (c/a) ratio from the ideal value is illustrated.

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Title
2.4.1 Special remarks
Book Title
Atomic Defects in Metals
In
2.4 hcp metals
Book DOI
10.1007/b37800
Chapter DOI
10.1007/10011948_69
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
25
Editors
  • H. Ullmaier
  • Authors
  • P. Ehrhart
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