SYNTHESIS, STRUCTURAL CHARACTERIZATION, AND MAGNETIC PROPERTIES OF THE PEROVSKITE COMPOUND EU_{1-X}SR_{X}FEO_{3}
The perovskite oxide compound Eu1-xSrxFeO3 was studied to determine the effect of Sr doping on changes in its structure and magnetic properties. Synthesis of Eu1- xSrxFeO3 for x=0, 0.1, 0.2, 0.3, and 0.4 was carried out using the sol-gel method and structural characterization was analyzed based o...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/80618 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The perovskite oxide compound Eu1-xSrxFeO3 was studied to determine the effect of
Sr doping on changes in its structure and magnetic properties. Synthesis of Eu1-
xSrxFeO3 for x=0, 0.1, 0.2, 0.3, and 0.4 was carried out using the sol-gel method
and structural characterization was analyzed based on the XRD patterns. The
single phase of the Eu1-xSrxFeO3 compound is obtained up to x=0.3. Single phase
EuFeO3 refinement can be used for XRD patterns with low Sr doping (x?0.1). This
indicates the crystal structure has not changed at low Sr doping. However, at high
Sr fractions (x?0.2), there is a phase segregation at the crystal structure which is
characterized by the appearance of the new peaks in the XRD pattern. Therefore,
refinement using single phase EuFeO3 is not suitable and two phases refinement of
EuFeO3 and Eu1/3Sr2/3FeO3 is needed. Refinement results and tolerance factor
values show that phase segregation occurs in the perovskite material. The results
of the refinement also show that the unit cell volume and average bond length of
Fe-O decrease with increasing Sr content. These results indicate the formation of
Fe4+ ions due to Sr doping. For x=0.1, an anomaly of the unit cell volume is found.
Furthermore, the results of magnetization measurements on the Eu1-xSrxFeO3
compound show the presence of weak ferromagnetism and antiferromagnetism
components based on its magnetic hysteresis curve. Modification of Jiles-Atherton
modeling on the hysteresis curve shows that saturation magnetization and
antiferromagnetic interactions increase with increasing Sr fraction. The
ferromagnetic component of the perovskite increases due to the formation of Fe4+,
while the antiferromagnetic interactions increase due to the increase in the Fe-O2-
Fe bond angle. The existence of these two magnetic components indicates that the
Eu1-xSrxFeO3 compound has a canted antiferromagnetic system
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