The Phase Transformation and Crystal Structure Studies of Strontium Substituted Barium Monoferrite

3rd International Seminar On Sciences "Sciences On Precision And Sustainable Agriculture"

Mulyawan, A.^1 ; Adi, W.A.^1 ; Mustofa, S.^1 ; Fisli, A.^1

Center for Science and Tecnhnology of Advanced Materials, National Nuclear Energy Agency of Indonesia (BATAN), Indonesia^1

关键词: Barium monoferrite;    Energy dispersive spectroscopies (EDS);    General structure analysis systems;    Orthorhombic structures;    Solid state reaction method;    Strontium substitutions;    Structure simulations;    X ray diffractometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/58/1/012070/pdf
DOI  :  10.1088/1755-1315/58/1/012070

来源: IOP

【 摘 要 】

Unlike other AFe2O4ferrite materials, Barium Monoferrite (BaFe2O4) have an orthorhombic structure which is very interesting to further study the crystal structure and phase formation. In this study, Strontium substituted Barium Monoferrite in the form of Ba(1-x)Sr(x)Fe2O4has successfully been synthesized through solid state reaction method which includes BaCO3, SrCO3, and Fe2O3as starting materials. Ba(1-x)Sr(x)Fe2O4was made by varying the dopant composition of Strontium (Sr2+) from x = 0, 0.1, 0.3, and 0.5. Each composition was assisted by ethanol and continued to the milling process for 5 hours then followed by sintering process at 900 °C for 5 hours. The phase transformation was studied by using X-ray diffractometer (XRD) and Rietveld refinement using General Structure Analysis System (GSAS) also 3D crystal visualization using VESTA. Referring to the refinement results, a single phase of BaFe2O4was formed in x = 0 and 0.1. The composition has orthorhombic structure, space group B b21m, and lattice parameters of a = 19.0229, b = 5.3814 c = 8.4524 Å, α = β = γ = 90° and a = 18.9978, b = 5.3802 c = 8.4385 Å, α = β = γ = 90° respectively. In the composition of x = 0.3 it was found that the phase of BaSrFe4O8begin to form due to the overload expansion of the Sr2+occupancy which made the distortion of the initial lattice parameters and finally in the x = 0.5 composition the single phase of BaSrFe4O8was clearly formed. Energy Dispersive Spectroscopy (EDS) was used to confirm the change of the material structure by measuring the elemental compound composition ratio. The result of EDS spectra clearly exhibited the dominant elements were Barium (Ba), Strontium (Sr), Iron (Fe), and Oxygen (O) with the compound ratio (Atomic percentage and mass percentage) correspond to the BaFe2O4and BaSrFe4O8phase.