Sonochemical synthesis of Dy3+ substituted Mn0.5Zn0.5Fe2-xO4 nanoparticles: Structural, magnetic and optical characterizations

M A Almessiere; Y Slimani; A Demir Korkmaz; S Güner; A Baykal; S E Shirsath; I Ercan; P Kögerler

doi:10.1016/j.ultsonch.2019.104836

Sonochemical synthesis of Dy³⁺ substituted Mn_0.5Zn_0.5Fe_2-xO₄ nanoparticles: Structural, magnetic and optical characterizations

Ultrason Sonochem. 2020 Mar:61:104836. doi: 10.1016/j.ultsonch.2019.104836. Epub 2019 Oct 23.

Authors

M A Almessiere¹, Y Slimani², A Demir Korkmaz³, S Güner⁴, A Baykal⁵, S E Shirsath⁶, I Ercan⁷, P Kögerler⁴

Affiliations

¹ Department of Biophysics, Institute for Research & Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia; Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia.
² Department of Biophysics, Institute for Research & Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia. Electronic address: yaslimani@iau.edu.sa.
³ Department of Chemistry, Istanbul Medeniyet University, 34700 Uskudar-Istanbul, Turkey.
⁴ Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
⁵ Department of Nano-Medicine Research, Institute for Research & Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia.
⁶ School of Materials Science and Engineering, University of New South Wales, Kensington, Sydney, NSW 2052, Australia.
⁷ Department of Biophysics, Institute for Research & Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia.

PMID: 31683234
DOI: 10.1016/j.ultsonch.2019.104836

Abstract

Mn_0.5Zn_0.5Dy_xFe_2-xO₄ (x ≤ 0.03) nanoparticles (NPs) were fabricated by using Ultrasonic irradiation using UZ SONOPULS HD 2070 ultrasonic homogenizer (frequency of 20 kHz and power of 70 W). Structural and morphological analyses were performed via XRD (X-ray powder diffractometer), TEM (Transmission electron microscopy) and SEM (Scanning electron microscopy). XRD presented the formation of Mn-Zn ferrite with average crystal size in 11 to 18 nm range. Direct optical energy band gaps (E_g) were specified applying diffuse reflectance investigations. E_g values are in a small band range of 1.61-1.67 eV. Low (10 K) and room temperature VSM data were recorded applying ±90 kOe external magnetic field. All samples exhibit superparamagnetic properties at RT. Magnetization parameters significantly increase due to coordination of Dy³⁺ rare earth ions. Magnetic moment per molecule (n_B) increases from 0.952 μ_B to 1.137 μ_B and from 2.312 μ_B to 2.547 μ_B at RT and at 10 K data respectively. 10 K coercivity (H_c) values decrease from 260 Oe to 43 Oe. All samples have squareness ratios (SQR) of 0.231-0.400 range assigning the multi-domain structure at 10 K. ZFC-FC magnetization curves that were registered for two selected samples exhibit a divergence and a sharp drop below their T_peak positions. This event is typically correlated to the collective freezing of system and spin-glass-like phase. Real part AC susceptibility data slightly shift toward high temperature regions with increasing frequencies. Critical Slowing Down (CSD) model explained the spin dynamics of interacting NPs consistently with literature and proved the spin-glass behavior of samples at low temperatures.

Keywords: AC susceptibility; Magnetization; Mn-Zn ferrite; Optical properties; Rare earth; Structure; ZFC-FC.