Effect of La3+ doping on structural, magnetic and LPG gas-sensing properties of Mg-Zn nano-ferrites

Materials Science and Engineering: B Pub Date : 2023-11-25 DOI:10.1016/j.mseb.2023.117029

Bindhyabasinee Mishra, Jyotirmayee Nanda, Subhra S. Brahma, K.J. Sankaran, R. Sakthivel, S. Ghadei, S. Suman

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Abstract

A series of polycrystalline mixed spinel ferrites, Mg_0.5Zn_0.5La_xFe_2-xO₄ (x = 0, 0.025, 0.05, 0.075, 0.1) were synthesized by hydrothermal method, where NaBH₄ was a reductant. The Rietveld refinement analysis demonstrated the La³⁺ occupancy in A and B positions. FESEM and HRTEM have shown nearly spherical nanoparticles with an average size of 7 nm. The existence of all the component elements were confirmed by EDS and XPS studies. Raman analysis have shown slight blue shift with higher La³⁺ concentration. These nano-ferrites were noticed to behave ferromagnetically, with small remanent magnetization. The nano-ferrites were tested for the LPG sensing, where the sensor response was understood by proposing the charge carrier (Fe²⁺ and Fe³⁺) hopping mechanism. The sensor response (%) of the sample (x = 5%) at 500 ppm exhibited highest value ∼36, as compared to sample (x = 0%). To conclude, Mg_0.5Zn_0.5La_0.05Fe_1.95O₄ showed better response and recovery time, rather than other spinel ferrites.

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La3+掺杂对Mg-Zn纳米铁氧体结构、磁性和LPG气敏性能的影响

以NaBH4为还原剂，水热法制备了Mg0.5Zn0.5LaxFe2-xO4 (x = 0, 0.025, 0.05, 0.075, 0.1)多晶尖晶石混合铁素体。Rietveld精化分析表明La3+在A和B位置占有。FESEM和HRTEM显示了接近球形的纳米颗粒，平均尺寸为7 nm。通过EDS和XPS研究证实了所有成分元素的存在。拉曼分析表明，随着La3+浓度的增加，蓝移现象轻微。这些纳米铁氧体具有铁磁性，剩余磁化强度小。通过提出电荷载流子(Fe2+和Fe3+)跳变机制来理解传感器响应，对纳米铁氧体进行了LPG传感测试。与样品(x = 0%)相比，样品(x = 5%)在500 ppm时的传感器响应(%)显示出最高值~ 36。综上所述，Mg0.5Zn0.5La0.05Fe1.95O4比其他尖晶石铁素体具有更好的响应和恢复时间。

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Materials Science and Engineering: B

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