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Abstract
The effect of heat treatment on the photosensitivity and electrophotographic properties of lead monoxide powder has been investigated. There appears to be a critical temperature of annealing at which photosensitivity is maximum and the darkconductivity is minimum. The electrophotographic behaviour characterized by acceptance potential, dark discharge rate, contrast potential, etc. improved considerably on thermal treatment. The results have been explained mainly on the basis of barrier layer formation at the intergranular sites.