Exploring Magnetic Properties through Structural Characterization of PtNi Alloy Nanoparticles

Mustafa Zeki Kurt

doi:10.5281/zenodo.8007887

Authors

Mustafa Zeki Kurt Cukurova University, Faculty of Art and Sciences, Department of Physics, 01330, Adana, Türkiye https://orcid.org/0000-0002-3980-0692

DOI:

https://doi.org/10.5281/zenodo.8007887

Keywords:

Polyol process, XRD, Magnetic properties, SEM-EDS, PtNi alloy

Abstract

The control of magnetic properties of ferromagnetic metals is an important objective in alloying with noble metals. In this study, the structural and magnetic properties of PtNi nanoparticle (NP) were investigated through the alloying of Ni with Pt. The Pt_0.5Ni_0.5NP was synthesized using a modified polyol process. X-ray diffraction and Rietveld refinement analyses were conducted to determine the structural properties of the NP, revealing that they had an alloy form and an fcc-crystal structure with a space group of Fmm. The lattice constant and d₍₁₁₁₎-space of the PtNi NP were determined to be a=b=c=0.38221 nm and 2.2067 Å, respectively. Scanning electron microscope images and energy-dispersive X-ray spectra data confirmed that the NP was produced with high precision and without contamination; however, there was some degree of agglomeration. Magnetization curves were measured as a function of temperature between 5 K and 300 K, revealing three regions: paramagnetic between 200 K and 300 K, paramagnetic/ferromagnetic between 35 K and 200 K, and superparamagnetic/ferromagnetic regions below 35 K. Although no clear saturation magnetization region was observed up to ±3 T, the maximum magnetic moment of 4.26 emu/g was recorded at 5 K. This value decreased to 0.12 emu/g with increasing temperature to 300 K. Similarly, the coercive field was found to be 211 Oe at 5 K, and the hysteresis gap disappeared with increasing temperature, indicating a strong paramagnetic signal in the structure. The effective anisotropy constant was reduced to 3.01 10⁶ erg/cm³, and the effective magnetic moment was reduced to 0.0937 μ_B due to the paramagnetic contribution of Pt in the alloy with Ni.

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