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Seebeck coefficients of YFe 2 O 4.0 and YFe 2 O 3.95 were measured from 190 K to 360 K. In YFe 2 O 4.0 charge and spin orderings occur and in YFe 2 O 3.95 only a spin ordering occurs and thus the effects of orderings on Seebeck coefficient were clearly observed in those oxides. At higher temperatures, coefficients of both specimens become negative and their absolute values increase with temperature as those of Ce 3- x S 4 . The data of YFe 2 O 4.0 resemble those of Fe 3 O 4 below the Verwey transition temperature. The coefficient of YFe 2 O 3.95 decreases as the temperature is decreased below the Néel temperature.
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Enomura et al. (1983) studied this question.
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