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The Influence of Isotopic Mass on Some Physical Properties of Iron


McCaldin, James Oeland (1954) The Influence of Isotopic Mass on Some Physical Properties of Iron. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/NYAY-8G77.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. This thesis presents the results of an experimental study to determine whether atomic mass has an appreciable influence on certain physical properties of metals. Iron was chosen for this investigation, several specimens of natural iron of high purity and two specimens of iron enriched in the isotopes Fe54 and Fe57 being available. Measurements of the temperature coefficients of electric resistance between 67[degrees] and 270[degrees]K indicate an isotopic effect in qualitative agreement with deductions from the Gruneisen theory. The previous results of Tuyn may also be interpreted to give agreement with this theory and therefore are preferred to other previous work in disagreement with the theory. No isotopic influence on thermoelectric power at temperatures between 80[degrees] and 270[degrees]K is found. If such an influence does exist however, it is probably less than 0.5[...]V/[degrees]K for a thermocouple made of Fe54 and Fe57. Measurements of the temperature of the alpha-gamma allotropic transformation do not indicate an isotopic effect on this temperature. A difference of 2.5[degrees]C in the transformation temperatures of the isotopes Fe54 and Fe57 which is suggested by theoretical considerations, cannot be excluded on the basis of the present measurements, however, because of the hysteresis observed in the present study.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Mechanical Engineering and Physics)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Duwez, Pol E.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1954
Record Number:CaltechETD:etd-01152004-100956
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:183
Deposited By: Imported from ETD-db
Deposited On:16 Jan 2004
Last Modified:13 Jun 2023 20:50

Thesis Files

PDF (McCaldin_jo_1954.pdf) - Final Version
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