EPR, X-ray, and magnetization studies of metastable alloys

This study investigates the synthesis and properties of metastable alloys with nominal compositions Ti2Fe, AlCuMn2Ge2, and Al65Cu20Fe15 through mechanical alloying techniques. The objective was to explore the structural and magnetic characteristics of these alloys using Electron Paramagnetic Resonance (EPR), X-ray diffraction, differential thermal analysis, and magnetization techniques. Different durations of mechanical alloying were applied, leading to the formation of unique metastable phases as confirmed by X-ray analysis. The results reveal that the EPR spectra provided valuable insights into the paramagnetic behavior of transition metal ions within the alloys, demonstrating a significant dependency on temperature variations. Additionally, it was observed that the magnetic ordering within the Ti2Fe system is influenced by phase separations, where the mechanical alloying duration played a critical role in the resulting magnetic properties. The findings indicate that the disorder of paramagnetic ions within the alloys increases with elevated temperature, suggesting that the method of preparation introduces intrinsic disorder and strain, thereby affecting the magnetic behavior of the materials significantly. These insights into the magnetic properties of transition-metal-based metastable alloys contribute to the growing interest in their potential applications.