The hydroxide ion as a substitutional defect in KC1 can be photo-dissociated
at liquid nitrogen temperature by ultraviolet light. The
photochemistry of this system was investigated by EPR and optical absorption
methods. Theoretical calculations were also performed in an
investigation of the KC1:OH system.
The bleaching behavior of photochemically colored...
Direct current conductivity measurements on KC1:O[superscript]= crystals
were used to determine an enthalpy of 0.42 ev for the dissociation for
anion-vacancy-oxide ion complex.
The entropy of dissociation was
found to be approximately -4x 10⁻⁴ev deg⁻¹. The intrinsic "activation" energy was found to be 1.91 ev as compared to 1.95 ev,...
When the dc conductivities of various pure KC1 crystals were
compared it was found that crystals grown under an HC1 atmosphere,
from salt purified by ion exchange, exhibited lower knee temperatures
than any of the crystals studied. These knee temperatures
were found to be approximately 350°C. From this the total...
The photochemical reaction between O⁻ ions and F centers
was investigated. The activation energy was determined by the
Arrhenius law to be 0.10 + 0.04 eV for temperature below 180°K.
The diffusion of alpha centers towards the oxide ion was eliminated
as the rate limiting step and the low trapping...
The incorporation of europium and dysprosium in potassium
chloride crystals was investigated. The crystals were prepared by
the Kyropoulos method from melts containing the rare-earth chlorides.
The concentration of these rare-earth ions in the crystals was determined
by neutron-activation analysis. The distribution coefficient of
europium and dysprosium between the molten...
The dc conductivity of single crystals of vanadium pentoxide
was measured in the three crystallographic directions. The temperature
range examined was -165°C to +25°C. The activation energy
of the conduction process was isotropic and found to be .56 ev. The
conductivity was anisotropic.
Measurements of the Hall effect were attempted...
Vanadium pentoxide electrodes were prepared by melting
the powdered oxide around a platinum foil in a pyrex tube. The
electrode was discharged, and the discharge product was studied,
but not identified, by means of chemical and x-ray diffraction analysis.
A study was made of the relationship between the electrode
potential...
Vanadium pentoxide single crystals were grown from the melt.
These crystals were made the cathode in an electrolytic cell and the
polarization and recovery of the electrode were studied under a
variety of experimental conditions.
A study of the electrode potential versus that of the standard
hydrogen electrode as a...