Seebeck Coefficient of YFe₂O₄

Abstract

Seebeck coefficients of YFe₂O_4.0 and YFe₂O_3.95 were measured from 190 K to 360 K. In YFe₂O_4.0 charge and spin orderings occur and in YFe₂O_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−xS₄. The data of YFe₂O_4.0 resemble those of Fe₃O₄ below the Verwey transition temperature. The coefficient of YFe₂O_3.95 decreases as the temperature is decreased below the Néel temperature.