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<p>The investigation focused on the impact of magnesium (Mg) doping on the structural and physical properties of the rare earth orthoferrite LaFeO<sub>3</sub> (LFO). The La<sub>1-x</sub>Mg<sub>x</sub>FeO<sub>3</sub> (<i>x</i> = 0.00, 0.05, 0.10, and 0.15) nanoparticles (LMFO) were synthesized using an ultrasonication-assisted sol–gel method. The analysis of X-ray diffraction data via Rietveld refinement confirmed the monophase composition of LMFO samples, which crystallize in an orthorhombic structure defined by the <i>pbnm</i> space group. The incorporation of Mg doping has led to a contraction in the lattice structure, attributed to the presence of small cationic dopants. The examination of microstructure and composition was performed utilizing FESEM-EDX, which indicated that the particle size is within the nano range. The rationale for lattice contraction and monophase composition is further corroborated by FTIR and Raman analysis. The optical analysis performed in the ultraviolet–visible spectrum revealed a decrease in the bandgap energy associated with a rise in magnesium content. The dielectric dispersion behavior was analyzed for LMFO samples. The introduction of multivalent states led to an improvement in dielectric behavior via aliovalent doping. The LMFO samples exhibit <i>p</i>-type semiconducting properties when exposed to ethanol, methanol, and LPG at temperatures up to 250&#xa0;°C. However, the most significant response was recorded for La<sub>0.9</sub>Mg<sub>0.1</sub>FeO<sub>3</sub> when ethanol was present at ambient temperature, while at higher temperatures, the peak sensitivity was observed for methanol. As a result, the study successfully identified La<sub>0.9</sub>Mg<sub>0.1</sub>FeO<sub>3</sub> as an important gas sensing material for ethanol, methanol, and LPG.</p>

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Structural correlation of Mg2+ doping on optical, dielectric, and gas sensing properties of LaFeO3

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Vineet Sahu,
  • Deepshikha Rathore,
  • Shubha Dubey,
  • Kumud Dubey,
  • Chinmay Sahu,
  • Rishi Raj Singh Rathore,
  • Anchit Modi,
  • N. K. Gaur

摘要

The investigation focused on the impact of magnesium (Mg) doping on the structural and physical properties of the rare earth orthoferrite LaFeO3 (LFO). The La1-xMgxFeO3 (x = 0.00, 0.05, 0.10, and 0.15) nanoparticles (LMFO) were synthesized using an ultrasonication-assisted sol–gel method. The analysis of X-ray diffraction data via Rietveld refinement confirmed the monophase composition of LMFO samples, which crystallize in an orthorhombic structure defined by the pbnm space group. The incorporation of Mg doping has led to a contraction in the lattice structure, attributed to the presence of small cationic dopants. The examination of microstructure and composition was performed utilizing FESEM-EDX, which indicated that the particle size is within the nano range. The rationale for lattice contraction and monophase composition is further corroborated by FTIR and Raman analysis. The optical analysis performed in the ultraviolet–visible spectrum revealed a decrease in the bandgap energy associated with a rise in magnesium content. The dielectric dispersion behavior was analyzed for LMFO samples. The introduction of multivalent states led to an improvement in dielectric behavior via aliovalent doping. The LMFO samples exhibit p-type semiconducting properties when exposed to ethanol, methanol, and LPG at temperatures up to 250 °C. However, the most significant response was recorded for La0.9Mg0.1FeO3 when ethanol was present at ambient temperature, while at higher temperatures, the peak sensitivity was observed for methanol. As a result, the study successfully identified La0.9Mg0.1FeO3 as an important gas sensing material for ethanol, methanol, and LPG.