Slimani, YassineAlmessiere, M. A.Korkmaz, A. DemirGüner, SadıkGüngüneş, HakanSertkol, MuratBaykal, Abdulhadi2022-05-112022-05-1120191350-41771873-2828https://doi.org/10.1016/j.ultsonch.2019.104757https://hdl.handle.net/20.500.11776/6741The Fe3+ ions were replace with Tb3+ ions as highly paramagnetic rare earth element within the structure of Ni0.4Cu0.2Zn0.4Fe2O4 nano-spinel ferrites (NSFs). The structural, magnetic, spectroscopic and optic properties have been studied in details. All products have been synthesized via ultrasonic approach via Qsonica ultrasonic homogenizer, frequency: 20 kHz and power 70 W for 60 min. No annealing or calcination process was applied for any product. The microstructural analysis of products has been done via X-ray powder ciiffractometry (XRD) which presented the cubic spinel structure with nanosized distribution of all. The cubic morphology of all products were confirmed by both HR-TEM and FE-SEM. Optical band gap (E-g) values were assessed by applying %DR (percent diffuse reflectance) analysis and Kubelka-Munk theory. The Tauc schemes showed that E-g values are in a narrow range (1.87-1.98 eV). The quadrupole splitting, line width, hyperfine magnetic field, isomer shift values and cation distribution have been determined from Fe-57 Mossbauer analysis. The magnetic properties of various nanoparticles have been obtained from VSM (vibration sample magnetometer) measurements at 10 and 300 K (RT). The magnetic results revealed superparamagnetic and soft ferromagnetic traits at 10 and 300 K, respectively. M-s (saturation magnetization) and M-r (remanence) initially increase with increasing Tb(3+ )substituting level up to x = 0.06 then diminish for further x values. H-c (coercivity) shows an opposite variation tendency of M-s and M-r. The observed magnetic traits are deeply discussed in relation with the structure, morphology, magnetic moments and cation distributions.en10.1016/j.ultsonch.2019.104757info:eu-repo/semantics/openAccessMagnetic nanomaterialsRare earth substitutionStructureOptical propertiesMagnetic propertiesCation distributionAntibacterial Biomedical ActivityMagnetic-PropertiesElectrical-PropertiesMagnetooptical PropertiesCoprecipitation MethodTemperature SynthesisStructural-PropertiesCatalytic-PropertiesCombustion SynthesisOptical-PropertiesArticle59Q1WOS:0004884171000292-s2.0-8507157619431479888Q1