Abstract
Microwave photoconductivity and photodielectric measurements using a tuned microwave cavity method, operating in real time, were carried out for a series of commercial titanium dioxide (TiO 2) pigments. Changes in attenuation of microwave power and resonant frequency were shown to be sensitive to changes in particle size and composition. The data was interpreted by consideration of the relative contribution of excess carriers following saturation of traps during exposure, and the formation of long-lived states that persist during dark storage.
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