Electronic Structure of Zn Doped Fe<SUB>3</SUB>O<SUB>4</SUB> Thin Films

Abstract

We investigated the effect of Zn doping on the electronic property of magnetite by using optical spectroscopy. The (Zn(x)Fe(1-x))Fe2O4 (ZFFO) (x = 0, 0.2, 0.4, and 0.5) samples were prepared by PLD technique. The XRD measurement revealed that all the samples have an inverse spinel-type of crystalline structure. The M-H curves indicate that the saturation magnetization reduces with the increasing x. From the spectroscopic ellipsometry and infrared spectroscopy, we found that the doping of nonmagnetic Zn2+ ions leads to the dramatic change in the electronic structure of the ZFFO films. We discuss the correlation of our spectra with the electric and magnetic properties of the ZFFO films.

Role of Zn And Polyaniline In Magnetic Nanocomposites And Enhanced Arsenic Adsorption Capacity In Wastewater

“…63 emu/g). Unlike the replacement of transition metal elements Cu, Mn, Ni for Fe 2+ into octahedral B-site [24, 25,27], preferably the replacement of 𝑍n 2+ ions for Fe 3+ at tetrahedron A-site occurs [19,26], simultaneously 𝐹𝑒 2+ amount at the octahedral B-site gives electrons to become Fe 3+ in order to balance the charge of cell network [19,26]. Since the ionic radius of the Fe 3+ ion is 0.64 Å and the ionic radius of the Zn 2+ ion is 0.74 Å, the substitution of Zn with content x = 0.10 caused a slight increasing of the lattice constant (a = 8.386 A 0 ) in comparison with Fe 3 O 4 (a = 8.3760 A 0 ) [30,36].…”

“…Transition metal doped Fe 3 O 4 magnetic nanomaterials attract attention of the scientists due to their wide applications, especially in water treatment or other environmental pollution monitoring [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Recently, Cd, Cr, As removals were observed using the metal oxide hetero-structures, as meso-porous MnO 2 , Al 2 O 3 , TiO 2 , CuO, ZrO 2 [1,[17][18][19][20][21][22][23]. The major backwards of using these oxides are the di culties in their recovery and thus leaving their residuals in the environment.…”

“…Due to the rapid oxidation of Fe 3 O 4 into γ-Fe 2 O 3 in air as well as its decreased magnetization, large numbers of studies have focused on improving the saturation magnetization and chemical stability of the magnetic nanomaterials for effective heavy metal ion adsorption [10,19,[24][25][26][27][28][29]. Two research directions are being considered: (i) partial replacement of divalent metal ions for Fe 2+ ions, and (ii) coating of magnetic nanoparticles by polymers.…”

“…The unit cell of Fe 3 O 4 consists of two kinds of interstitial sites denoted as tetrahedral A-site (Fe 3+ ) and octahedral B-site (Fe 2+ : Fe 3+ =1: 1) [19,25]. The divalent metal ions like Mn 2+ , Cu 2+ and Zn 2+ are usually substituted into B-site to form inverse spinel ferrites such as Fe 1−x Mn x Fe 2 O 4 (with x = 0 ÷ 0.15 or 0.5) [27,30], Fe 1−x Cu x Fe 2 O 4 (with x = 0 ÷ 0.15) [30], Ni x Fe 3-x O 4 sample system (x = 0.04; 0.06; 0.11) [25], or Ni 1−x Zn x Fe 2 O 4 sample system (x = 0, 0.5 and 1) [26].…”

“…The divalent metal ions like Mn 2+ , Cu 2+ and Zn 2+ are usually substituted into B-site to form inverse spinel ferrites such as Fe 1−x Mn x Fe 2 O 4 (with x = 0 ÷ 0.15 or 0.5) [27,30], Fe 1−x Cu x Fe 2 O 4 (with x = 0 ÷ 0.15) [30], Ni x Fe 3-x O 4 sample system (x = 0.04; 0.06; 0.11) [25], or Ni 1−x Zn x Fe 2 O 4 sample system (x = 0, 0.5 and 1) [26]. However, Fe 1−x Zn x Fe 2 O 4 (x = 0; 0.2; 0.4; 0.5) thin lms or nanopowders with pretty large magnetization were con rmed by the partial substitutions of Zn 2+ ions into A-sites [19,31].…”