Recent Advances in Science and Technology of Materials

Volume 1

  • Adli Bishay

Table of contents

  1. Front Matter
    Pages i-xv
  2. Defects in Solids

    1. J. H. Crawford Jr., E. L. Kitts Jr.
      Pages 15-26
    2. E. Yu. Brailovskii, V. N. Broudnyi, I. D. Konozenko, M. A. Krivov
      Pages 47-58
  3. Electrical Properties

  4. Magnetic Properties

    1. F. Assabghy, E. Boulos, S. Calamawy, A. Bishay, N. Kreidl
      Pages 235-246
    2. S. Arafa, S. Haraldson, A. Hassib
      Pages 247-258
    3. B. D. Perlson, D. B. Russell, R. J. Guttormsom, B. E. Robertson
      Pages 259-269
  5. Radiation Effects

  6. Chemistry

    1. R. Sh. Mikhail, S. A. Abo-El-Enein, G. A. Oweimreen
      Pages 337-349
    2. Selim F. Estefan, Mounir A. Malati
      Pages 351-364
    3. S. M. El Raghy, M. M. Ibrahim, A. E. El-Mehairy
      Pages 389-406
  7. Back Matter
    Pages 407-419

About this book


If an ion in a crystal is replaced by an impurity ion with a different charge, compensation for the charge difference must be accomplished. This is usually done by an intrinsic defect, i. e. a lattice vacancy or interstitial host ion, in such a way to balance the excess or deficit of charge. The introduction of cation vacan­ cies along with divalent cation impurities in alkali halides is a familiar example. If these crystals are carefully annealed, nearly all of the compensating defects migrate to the impurity ions to form impurity-defect complexes. It is the behavior of these complexes that are the principal concern in this paper. Almost invariably such complexes are dipolar in character, and when subjected to an electric or mechanical stress field, they will tend to realign to an orienta­ tion of lower energy provided the thermal activation is sufficiently great. If the complex consists of an impurity-vacancy couple, re­ orientation may occur either by the vacancy moving around the impu­ rity or by an exchange of positions of the partners. In general the activation energy for these two distinct reorientation paths is different. If the complex consists of an impurity-interstitial couple, interchange of positions is unlikely and reorientation is considered to occur exclusively by the motion of the interstitial around the vacancy.


X-ray crystal defects deformation energy glass iron material materials metals semiconductors stress

Editors and affiliations

  • Adli Bishay
    • 1
  1. 1.Solid State and Materials Research CenterAmerican University in CairoCairoEgypt

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