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The article states that hafnium and chlorine react above 317 °C: as the reaction has a high negative entropy change, it will be disfavored by high temperatures. Indeed, the reverse of the reaction is used for refining hafnium! The production section could do with double-checking and referencing. (but thanks, the article is coming on great!) Physchim62 (talk) 04:19, 28 February 2006 (UTC)