Doping Effect of W&lt;sup&gt;6+&lt;/sup&gt; Ions on Microstructural and Magnetic Properties of Mn-Zn Ferrites

Xing, Qing Kai; Peng, Zhi; Wang, Cheng Biao; Fu, Zhiqiang; Fu, Xianliang

doi:10.4028/www.scientific.net/kem.512-515.1408

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“…Madake et al compared the crystalline and gas sensing characteristics of Ni x Zn 1-x Fe 2 O 4 (x = 0 to 0.5) thin films prepared via spray pyrolysis [24]. Xing et al investigated the influence of tungsten as a foreign ion on the structure and magnetic characteristics of Mn-Zn mixed ferrites [25]. Srinivas et al investigated the magnetic behavior of co-precipitated Ni-Zn ferrite nanoparticles and their potential use as gas sensors [26].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of W-Substituted ZnFe2O4 for Gas Sensing Applications

et al. 2022

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A sol–gel technique was successfully employed in creating pure and W-substituted zinc ferrite, with nominal compositions of ZnFe2−2xWxO4 (0.0 ≤ x ≤ 0.15). For the purposes of investigating the physical and chemical properties of the generated powders, several analytical techniques were used. In TEM images of all the compositions, mixed-shaped particles (cubic, spherical, and hexagonal) were observed. The crystallite size decreases from 82 nm (x = 0.0) to 32 nm (x = 0.15) with an increase in the W doping contents in the ZnFe2O4 lattice. The microstrain increases with increasing W doping content. Furthermore, the surface area of pure ZnFe2O4, 0.05 W-ZnFe2O4, 0.10 W-ZnFe2O4, and 0.15 W-ZnFe2O4 NPs were calculated as being 121.5, 129.1, 134.4 and 143.2 m2 g−1, respectively, with a mesoporous pore structure for all ferrite samples. The calculated BJH pore size distribution was within the range of 160 to 205 Å. All W-doped ZnFe2O4 samples show H-M loops with paramagnetic characteristics. The magnetization (M) directly increases by increasing the applied field (H) without achieving saturation up to 20 kA/m. For comparison, the magnetization at 20 kA/m gradually decreases with increasing W doping content. Among all the synthesized samples, the 0.15 W-ZnFe2O4 NPs demonstrated the highest sensitivity towards acetone gas at 350 °C.

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Section: Introductionmentioning

confidence: 99%