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We propose an unconventional method to obtain fine-grained SnO2and WO3powders. It uses as precursors, polymer complexes between polyethylene oxide (POE) and SnCl4or WCl6respectively. By pyrolysis of these complexes in the 350-550℃ temperature range, metal-oxide powders possessing small crystallite sizes are obtained. They are free from water and hydroxyl group contaminations, which is an added advantage where the application of these materials to Li-batteries is concerned. We have, indeed,doi:10.1155/1995/79465 fatcat:rtrmtsj7u5axhmkm2v2fpunoty