Microwave photodielectric and photoconductivity studies on titanium dioxide exposed to continuous polychromatic irradiation; Part II: Correlation of the microwave response with changes in sample microstructure during milling

Microwave photoconductivity and photodielectric measurements using a tuned microwave cavity method, operating in real time, were carried out for a ser ies of commercial titanium dioxide (TiO2) pigments. Changes in attenuation of microwave power and resonant frequency were shown to be sensitive to cha nges in particle size and composition. The data was interpreted by consider ation of the relative contribution of excess carriers following saturation of traps during exposure, and the formation of long-lived states that persi st during dark storage. (C) 1999 Elsevier Science S.A. All rights reserved.