Висмутээр хольцолсон нано хэмжээст BixFe3-xO4 магнетит нэгдлийн бүтэц, физик шинж чанарын судалгаа
DOI:
https://doi.org/10.22353/physics.v40i646.11066Keywords:
магнетит (Fe3O4), висмут (Bi), хольц, хориотой бүсийн энергийн өргөн, хагас дамжуулагч наноматериалAbstract
Энэхүү ажлаар урвуу шпинель бүтэцтэй, нанохэмжээст BixFe3-xO4 (x=0.0-0.3) физик нэгдлийн шинж чанарын судалгааг хийж гүйцэтгэлээ. x=0 үед урвуу шпинель бүтэцтэй магнетит (Fe3O4) нэгдлийг хам тунадасжуулах арга ашиглан нэмэлт хольцгүй, цэврээр гарган авав. Fe3O4 нанопартиклыг Bi -ээр хольцлоход торын эзэлхүүн 581.56 Å3-ээс 586.80 Å3 болон тэлсэн. Мөн BixFe3-xO4 нэгдлийн FTIR спектрт 904 ба 1325 см-1 долгион тоонуудад Bi-O-Bi холбооны валентын хэлбэлзэлд харгалзах пикүүд илэрсэн. Bi хольцын нөлөөгөөр Fe3O4-н хориотой бүсийн өргөн 1.78 эВ -ээс 1.50 эВ хүртэл буурч, электрон дамжууллыг нэмэгдүүлж байгааг тогтоов. Эдгээр үр дүнгүүд магнетитийн кристаллын орон тор дахь төмрийн атомыг висмутийн атом халж суусныг илтгэж байна.
Abstract: Among iron-oxide magnetic materials, three main phases are commonly encountered, namely hematite (α-Fe₂O₃), maghemite (γ-Fe₂O₃), and magnetite (Fe₃O₄). Among them, Fe₃O₄ is a ferrimagnetic semiconductor exhibiting high saturation magnetization in the temperature range of 112–840 K. It possesses an inverse spinel structure in which Fe³⁺ cations occupy the tetrahedral (A) sites, whereas Fe²⁺ and Fe³⁺ cations are distributed over the octahedral (B) sites. This unique cation arrangement gives rise to its excellent magnetic and electronic properties, making Fe₃O₄ an attractive material for various high-tech applications.
In this work, the properties of BixFe(3−x)O₄ (x = 0.0–0.3) compounds were investigated with the aim of improving their physical characteristics. The crystal structure and properties of the samples were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and ultraviolet–visible (UV–Vis) spectroscopy. XRD analysis confirmed the successful synthesis of pure Fe₃O₄ (x = 0) phase with an inverse spinel structure by the co-precipitation method. For x > 0.1, Bi-doped compounds were obtained, and the cell volume expanded from 581.56 ų to 586.80 ų, indicating the incorporation of Bi into the magnetite crystal structure. UV–vis measurements revealed that Bi doping reduced the optical band gap of Fe₃O₄ from 1.78 eV to 1.50 eV, suggesting an enhancement of its electronic conductivity.
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