Tuning the Structural and Magnetic Properties of the Stuffed Framework Structures MeFe2O4 (Me = Ni, Ca, and Sr)

Abstract

Spinel ferrite nanoparticles (NPs), have received a lot of attention in medical applications. Therefore, facile synthesis of ferrite NPs of numerous shapes and sizes using the citrate autocombustion technique was utilized in this article. A series of ferrite with the general formula MeFe2O4 [Me = nickle (Ni), calcium (Ca), and strontium (Sr)] are synthesized with varying average ionic radii and cation disorder on the A-site. The structural and morphological characterization of the prepared samples was performed using XRD, HRTEM, FESEM, EDAX, XPS, and Raman analyses. The phase transformation from cubic (Ni) to orthorhombic (Ca) to monoclinic (Sr) was also revealed by XRD. Accordingly, HRTEM images demonstrated nanoparticles in orthorhombic and monoclinic shapes, which are inconsistent with XRD analyses. The coercive field HC for monoclinic SrFe2O4 is ≈ 42 times larger than the Hc for NiFe2O4 with a cubic structure. This deviation in HC compared to the cubic shape particles can be coupled to the shape anisotropy present in SrFe2O4 and refers to the presence of a preferred magnetization direction within the material. The use of monoclinic SrFe2O4 NPs as antifungal activity agents is noteworthy due to their advantages in terms of surface area, efficacy, and biodegradability.

A facile novel synthesis of AgCuO2 delafossite nanoparticles and evaluation of their antimicrobial activity

“…6d) can be deconvoluted into four component peaks. The oxide species (O 2− ) are accountable for the observed component peaks at 529.63 and 531.42 eV, where the peroxide species are responsible for the peak component at 532.24 eV 30,31 . At 533.13 eV 35,36 , the OH-group can be assigned to the component.…”

Designing bi-functional Ag-CoGd0.025Er0.05Fe1.925O4 nanoarchitecture via green method

“…Figure 3 illustrates the RS of virgin SF-NPs, showing five distinct peaks demonstrating the development of cubic SF caused by Co-O, Gd/Er-O, and Fe-O vibrations. The peaks at 674.58 cm −1 correspond to bands of the A 1g symmetry [38].…”

Influence of potassium doping on the structural, conduction mechanism, and dielectric properties of CaFe2O4

“…These values are higher than those given in the literature, which is attributed to the larger K + ionic radius compared to Ca 2+ . 32–34…”

“…These values are higher than those given in the literature, which is attributed to the larger K + ionic radius compared to Ca 2+ . [32][33][34] The average size of crystallites (DSC = 140.07 nm) is calculated through the classical Debye-Scherrer equation, 28 employing the full width at half maximum.…”