Graduate Thesis Or Dissertation
 

Donor centers in vanadium pentoxide

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  • The dielectric relaxation of V₂ 0₅ was investigated using the method of Davidson and Cole. By means of an Argand diagram, deviation from an exact Debye dielectric was established. This was done with the parameter β. For a Debye dielectric β= 1. The largest value of β for V₂O₅ was 0.50. The activation energy of the dielectric relaxation process was determined as 0.16 eV. The average activation energy of d-c conduction was determined to be 0.23 eV. This was measured by means of a two-electrometer system designed by the author. The process of polaron hopping was discounted as the process of dielectric relaxation. This was attributed to the high critical temperature requirement set down by Sewell. In place of the hopping model, tunneling is accepted as the means of dipolar reorientation. The value of the d-c activation energy is 0.07 eV larger than the a-c related process. This is the additional energy required for ionization of an electron from a positive defect, such as an interstitial impurity cation or oxide-ion vacancy, to which it experiences Coulombic attraction. 0 5 was investigated using the method of Davidson and Cole. By means of an Argand diagram, deviation from an exact Debye dielectric was established. This was done with the parameter β. For a Debye dielectric β= 1. The largest value of β for V₂O₅ was 0.50. The activation energy of the dielectric relaxation process was determined as 0.16 eV. The average activation energy of d-c conduction was determined to be 0.23 eV. This was measured by means of a two-electrometer system designed by the author. The process of polaron hopping was discounted as the process of dielectric relaxation. This was attributed to the high critical temperature requirement set down by Sewell. In place of the hopping model, tunneling is accepted as the means of dipolar reorientation. The value of the d-c activation energy is 0.07 eV larger than the a-c related process. This is the additional energy required for ionization of an electron from a positive defect, such as an interstitial impurity cation or oxide-ion vacancy, to which it experiences Coulombic attraction.
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