Scholarlink

<p>Multifunctional materials have a profound impact on device applications, which has led to increased attention from scientific research groups in the field of materials science. These materials exhibit exceptional ferroic order, with alternating properties that can be tailored to meet specific device requirements. Multiferroic materials are defined by the coupling of the three primary ferroic orders-ferroelectric, ferromagnetic, and ferroelastic-within a single structure. To address the growing need for detecting hazardous gas leaks and monitoring air pollution, it is essential to develop gas sensors that offer high sensitivity, stability, and selectivity. Due to their multifunctional properties and robust chemical structure, perovskite materials hold promise as a foundation for a wide range of device applications in engineering.This study investigates a room temperature multiferroic material with the chemical formula DyFeO<sub>3</sub> (DFO), also known as rare-earth orthoferrites. DFO particles are synthesized using mixed oxide processing followed by heat treatment. Rietveld analysis of the material reveals that DFO crystallizes in the <i>Pbnm</i> space group with orthorhombic symmetry. Dielectric measurements, taken at various frequencies and temperatures, suggest the material exhibits a high dielectric constant and low dielectric loss. The DFO pellet is evaluated for its potential in gas sensing applications in a metal–insulator-metal configuration. The results show that DFO offers a sub-ppm detection limit and demonstrates high selectivity for NO<sub>2</sub> gas, operating effectively at temperatures ranging from 50 to 200&#xa0;°C.Extensive and stable gas sensing performance, coupled with exceptional adsorption and desorption properties, is demonstrated through a series of cyclic tests. These remarkable gas sensing and dielectric characteristics suggest that ultra-sensitive gas sensors based on lead-free orthoferrites could become feasible. A pellet-type gas sensor was developed, eliminating the need for complex micro fabrication processes. The DyFeO<sub>3</sub> (DFO) sensor showed a response of 7.35% at 250&#xa0;°C to 150&#xa0;ppm of NO₂ gas. This work highlights the DFO’ high selectivity for NO<sub>2</sub> gas and demonstrates its superior gas sensing performance compared to basic DFO.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Multiferroic properties and gas sensing characteristics of rare earth orthoferrite DyFeO3 ceramic nanoparticles prepared by sol–gel method

  • 期刊论文

  • 发表日期：

    2025年10月24日

查看全文
  • V. S. Noorjahan Begum,
  • D. Zarena

摘要

Multifunctional materials have a profound impact on device applications, which has led to increased attention from scientific research groups in the field of materials science. These materials exhibit exceptional ferroic order, with alternating properties that can be tailored to meet specific device requirements. Multiferroic materials are defined by the coupling of the three primary ferroic orders-ferroelectric, ferromagnetic, and ferroelastic-within a single structure. To address the growing need for detecting hazardous gas leaks and monitoring air pollution, it is essential to develop gas sensors that offer high sensitivity, stability, and selectivity. Due to their multifunctional properties and robust chemical structure, perovskite materials hold promise as a foundation for a wide range of device applications in engineering.This study investigates a room temperature multiferroic material with the chemical formula DyFeO3 (DFO), also known as rare-earth orthoferrites. DFO particles are synthesized using mixed oxide processing followed by heat treatment. Rietveld analysis of the material reveals that DFO crystallizes in the Pbnm space group with orthorhombic symmetry. Dielectric measurements, taken at various frequencies and temperatures, suggest the material exhibits a high dielectric constant and low dielectric loss. The DFO pellet is evaluated for its potential in gas sensing applications in a metal–insulator-metal configuration. The results show that DFO offers a sub-ppm detection limit and demonstrates high selectivity for NO2 gas, operating effectively at temperatures ranging from 50 to 200 °C.Extensive and stable gas sensing performance, coupled with exceptional adsorption and desorption properties, is demonstrated through a series of cyclic tests. These remarkable gas sensing and dielectric characteristics suggest that ultra-sensitive gas sensors based on lead-free orthoferrites could become feasible. A pellet-type gas sensor was developed, eliminating the need for complex micro fabrication processes. The DyFeO3 (DFO) sensor showed a response of 7.35% at 250 °C to 150 ppm of NO₂ gas. This work highlights the DFO’ high selectivity for NO2 gas and demonstrates its superior gas sensing performance compared to basic DFO.