On the temperature dependence of the activation energy for diffusion
โ Scribed by G.J. Dienes
- Publisher
- Elsevier Science
- Year
- 1965
- Weight
- 232 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0001-6160
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โฆ Synopsis
EDITOR 1215 FIG. 4. Cyclohoxanol dendrites growing from the melt between glass slides 250 ~1 apart. x 60.
Many aspects of the solidification of metals can be studied using transparent compounds as analogues.
The interface morphology during the transitions from planar to cellular to dendritic growth can be studied in detail. The impurity distributions can be observed using fluorescent dyes. The growth kinetics and dendrite growth rates of these materials are also of interest. These materials hold special promise in clarifying many of the complex aspects of the solidification of alloys. B paper is in preparation in which we will discuss current theories of crystal growth in light of observations made on these compounds.
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supplemented by parallel and simultaneous morphological studies but they must be carried out whilst the deposition is in progress rather than after it was stopped, because of the necessity of measuring the rates of the moving entities, e.g., macrosteps, during growth. Only under these conditions can
Recent interest in the measurement and the interpretation of heat capacities of activation has led to more rigorous methods to detect temperature-varient activation parameters. One such method devised by Blandamer and co-workers was applied to the sucrose hydrolysis data of Moelwyn-Hughes and Leinin
was about 0.2 mm in dia. Creep tests under constant tensile stresses were carried out in argon atmosphere. The temperature dependence of steady-state creep rates under various stresses is shown in Fig. 1 from which three different stages can be clearly recognized; one in the high temperature region