University of Illinois Urbana-Champaign

Polaron transport in ionic crystals

Borders, James Alan

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Description

Title
Polaron transport in ionic crystals
Author(s)
Borders, James Alan
Issue Date
1968
Doctoral Committee Chair(s)
Brown, Frederick C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • polaron transport
  • ionic crystals
  • highly insulating photoconductors
  • space charge polarization
Language
en
Abstract
A new technique was developed for making measurements on highly insulating photoconductors. This technique features ease of data reduction, relative freedom from space charge polarization, and higher sensitivity and stability than that of previous designs. Using the new method, measurements were made of Hall effect, hot electron effects and magnetoconductivity in a variety of ionic crystals. The conduction bands of seven alkali halides were found to be isotropic with a measuring accuracy of ± 0.5%. Cyclotron resonance of photocarriers was observed at 139 GHz by electron heating effects. Polaron effective masses were measured in a variety of materials and the results compared with previous experiments and theory. In addition, transport effects due to spin polarization were qualitatively identified in colored potassium halides. These effects have been attributed to spin polarization of the F centers along with the conduction electrons. They have been analyzed using a simplified model. Preliminary measurements of spectral response of photoconductivity in AgBr have been made and the results compared with optical absorption. Structure has been found which may be related to the presence of minute traces of impurity such as iodine.
Type of Resource
text
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http://hdl.handle.net/2142/25744
Copyright and License Information
1968 James Alan Borders

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