engleski

Formation And Characterization Of Oxide Phases In The Fe2O3-Eu2O3 System

X-ray diffraction and Mossbauer spectroscopy were used to investigate samples, prepared by chemical coprecipitation, in the system (1-x)Fe2O3+ xEu2O3, 0 less than or equal to x less than or equal to 1. The samples obtained at 600 degrees C contained poorly crystallized phases and an amorphous fraction. When the temperature of heating was increased to 900 degrees C, the amorphous fraction disappeared and all samples were well crystallized. The temperature of formation of Eu_3Fe_5O_12 was significantly lower when chemical coprecipitation was used to prepare the starting material than when the solid state reaction was applied. The formation of alpha- Fe_2O_3, EuFeO_3, Eu_3Fe_5O_12, Eu_2O_3 and of an amorphous phase was dependent on x. The complex nature of the samples was reflected in their Mossbauer spectra. [References: 7]

Iron oxide ; Europium oxide ; Fe_2O_3-Eu_2O_3 system ; Mossbauer

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