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Defect-Induced Magnetism in Cerium-Doped Barium Zirconate Perovskites: A Systematic Electron Paramagnetic Resonance Study of Oxygen Vacancies and Dopant Effects
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DOI：10.1002/ntls.70062.png)
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Abstract
En 中文
This study presents a systematic investigation of the magnetic and structural properties of cerium-doped barium zirconate (BaZr1 - xCexO3, x = 0.005-0.04) perovskites synthesized by a microwave-assisted hydrothermal route. X-ray diffraction confirmed a dominant cubic perovskite phase, while Williamson-Hall analysis revealed dopant-induced microstrain. Field-emission scanning electron microscopy revealed a well-defined decaoctahedral morphology. Thermogravimetric analysis and differential scanning calorimetry demonstrated high thermal stability and revealed endothermic events associated with defect-related structural rearrangements. Electron paramagnetic resonance spectroscopy was employed to elucidate the evolution of the magnetic response attributed to oxygen vacancies. Upon cerium incorporation, systematic shifts in resonance field and linewidth reveal the development of defect-mediated magnetic coupling. Additional spectral features, such as F+-center-related signals and a non-monotonic doping dependence, point to the influence of cerium clustering and Ce3 +/Ce4 + valence fluctuations. These findings establish a direct correlation between defect chemistry, lattice strain, and magnetic behavior in BaZrO3-based perovskites, providing a pathway to engineer tunable magnetic functionalities through controlled rare-earth doping.
Keywords:
cerium-doped BaZrO3
defect-induced magnetism
electron paramagnetic resonance
lattice strain and defects
microwave-assisted hydrothermal synthesis
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