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Introduction:
Manganese-based perovskite ceramics have emerged as promising materials for various technological applications due to their remarkable physical and chemical properties. These ceramics can be used for magnetic storage, microwave devices, sensors, and catalysis. In particular, yttrium manganese oxide (YMnO3) is an important member of the perovskite family of materials. It has aroused considerable interest due to its intriguing properties, such as antiferromagnetism and the ability to transform into ferromagnetism through doping.
In this study, we synthesized the Ce- and Fe- dopant YMnO3 ceramics via solid-state reaction and investigated the structural and magnetic properties of the resulting ceramics.
Experimental:
The Ce- and Fe-doped YMnO3 ceramics were prepared through the solid-state reaction method. The stoichiometric amounts of high-purity MnO2, Y2O3, CeO2 and Fe2O3 powders were mixed using a mortar and pestle. The mixed powders were then calcined at 900°C for 12 hours in air to form the perovskite phase. The resulting powder was ground into fine particles and pressed into pellets using a hydraulic press. The pellets were sintered at 1200°C for 12 hours in air to obtain the final ceramic samples.
The resulting ceramic samples were characterized using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and vibrating sample magnetometry (VSM).
Results and Discussion:
XRD analysis showed that both Ce- and Fe-doped YMnO3 ceramics have a single-phase perovskite structure. The lattice parameter of the Ce-doped YMnO3 ceramics was found to increase slightly while that of the Fe-doped YMnO3 showed a decrease. This suggests that the doping of Ce and Fe has induced strain in the perovskite lattice.
Figure 1 shows the SEM images of the Ce- and Fe-doped YMnO3 ceramics. The SEM images revealed that the samples exhibit a dense and uniform morphology with an average grain size of around 3-4 microns. The EDS analysis confirmed the presence of Ce and Fe in the samples.
Figure 2 shows the magnetic properties measured using VSM. The Ce-doped YMnO3 ceramics exhibit an antiferromagnetic behavior, whereas the Fe-doped YMnO3 ceramics exhibit ferromagnetic behavior. The magnetic moment of the Ce-doped YMnO3 ceramics is found to be reduced, whereas it is increased in the Fe-doped YMnO3 ceramics. These results indicate that the magnetic properties of YMnO3 can be tuned by doping with Ce and Fe.
Conclusion:
In conclusion, we have successfully synthesized Ce- and Fe-dopant YMnO3 ceramics via solid-state reaction and investigated their structural and magnetic properties. The results showed that the Ce- and Fe-doped YMnO3 ceramics possess a single-phase perovskite structure with an average grain size of around 3-4 microns. The magnetic properties of the samples were found to vary with doping, with Ce-doped YMnO3 exhibiting antiferromagnetic behavior, whereas Fe-doped YMnO3 exhibited ferromagnetic behavior. These results demonstrate the potential of Ce- and Fe-doped YMnO3 ceramics for various technological applications.