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- W2020093042 abstract "Several titanium dioxide pigments in the rutile crystalline form have been doped with Ni, Co, Fe, Pb, Cu, V and Mo ions by co-precipitation in aqueous alkaline solution with titanium (IV) chloride. The photoconductivities in thin poly (vinyl carbazole) films and photodielectric microwave responses of the various transition-metal-doped titanium dioxide pigments have been measured and are discussed in terms of their photoactivities. The results suggest that different dopants affect the photoconductive and photodielectric responses of the titanium dioxide pigments to different extents. Photoconductive responses of the rutile pigments measured electrophotographically are enhanced on doping with the metal ions, and these responses increase with increasing concentration. Using microwave spectroscopy, the initial resonant frequency return loss decreases with a magnitude which is dependent upon the type and concentration of the cation. On steady-state illumination, the half-life of the photodielectric shift of the resonant frequency return loss is reduced, i.e., is more facile after doping, with the same order as that observed electrophotographically. The results are discussed in terms of the dopants occupying interstitial Ti(IV) sites in the crystal lattice and behaving as traps for photogenerated holes, thus reducing the photoactivity of the pigment." @default.
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- W2020093042 title "Electrophotographic and microwave photodielectric studies (I) effect of various transition metal dopants on titanium dioxide pigments in the solid state" @default.
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- W2020093042 doi "https://doi.org/10.1016/0143-7208(92)80046-p" @default.
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