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Formation of Oxide Phases in the System Eu2O3 - Fe2O3

Mira Ristić ; Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia
Israel Nowik ; Racah Institute of Physics, The Hebrevu University, Jerusalem, 91904 Israel
Stanko Popović ; Department of Physics, Faculty of Science, University of Zagreb, P. O. Box 331, HR-10002 Zagreb, Croatia
Svetozar Musić ; Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia

Puni tekst: engleski pdf 152 Kb


str. 525-540

preuzimanja: 493



Evolution of oxide phases in the Eu2O3-Fe2O3 system was investigated by X-ray powder diffraction, 57Fe and 151Eu Mössbauer spectroscopy and Fourier transform infrared spectroscopy. Samples were prepared by the solid state reaction of the corresponding oxides for two molar ratios, Eu2O3 : Fe2O3 = 1:1 and 3:5. After heating the mixed oxide powder with molar ratio Eu2O3 : Fe2O3 = 1 : 1 up to 900 °C, EuFeO3 and traces of Eu2O3 were detected by XRD, while after additional heating up to 1100 °C traces of Eu3Fe5O12 (EuIG) were also detected. 57Fe and 151Eu Mössbauer spectroscopy showed the presence of EuFeO3. For the molar ratio Eu2O3 : Fe2O3 = 3 : 5, EuIG was formed between 1100 and 1300 °C. In the sample produced at 1300 °C, the measured hyperfine fields at the iron sites, at room temperature, were Ha = 495 and Hd = 402 kOe, and the hyperfine fields at the europium sites, at 90 K, were HI = 631 kOe and HII = 572 kOe. Europium orthoferrite was the intermediate phase in the garnet formation. Assignations of IR bands corresponding to EuFeO3 and EuIG are discussed. Mechanical activation of the mixed oxide powder was important for the formation of polycrystalline EuIG, as a single phase.

Ključne riječi

X-ray powder diffraction; <sup>57</sup>Fe and <sup>151</sup>Eu Mössbauer; FT-IR spectroscopy; europium iron garnet; europium orthoferrite

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