Scholarlink

<p>This study examines the structural, dielectric, and electrical characteristics of La<sub>0.665</sub>Bi<sub>0.33</sub>Ba<sub>0.005</sub>Gd<sub>0.25</sub>Mn<sub>0.75</sub>O<sub>3</sub>, focussing on phase change and doping effects. X-ray diffraction (XRD) investigation indicates the development of a polycrystalline compound with an orthorhombic structure (space group Pbnm), which is corroborated using Rietveld refinement. The calculated tolerance factor (t = 0.7467) aligns with the perovskite structure. Dielectric measurements reveal a frequency-dependent negative dielectric constant (NDC) at low frequencies, which becomes prominent at elevated temperatures (~ 350&#xa0;°C), consistent with Drude theory and space charge polarization effects. The AC conductivity, as determined by Jonscher’s Universal Power Law, displays frequency and temperature dependency, which is linked to hopping conduction processes. Impedance spectroscopy indicates NTCR behaviour and grain boundary contributions, supported by Cole-Cole plots and equivalent circuit modelling. Electric modulus analysis shows temperature-induced transitions between capacitive and inductive responses, confirming dielectric anomalies. The thermistor response demonstrates strong NTC behaviour with calculated activation energy and TCR values. These findings highlight the role of doping and structural modifications in tuning the multifunctional properties of La<sub>0.665</sub>Bi<sub>0.33</sub>Ba<sub>0.005</sub>Gd<sub>0.25</sub>Mn<sub>0.75</sub>O<sub>3</sub> for advanced electronic applications.</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

Exploring NTC Thermistor Properties of La0.665Bi0.33Ba0.005Gd1-xMnxO3

  • 期刊论文

  • 发表日期：

    2025年4月29日

查看全文
  • Pratiksha Agnihotri,
  • Radheshyam Rai,
  • Shilpa Kumari,
  • Rahul Goel

摘要

This study examines the structural, dielectric, and electrical characteristics of La0.665Bi0.33Ba0.005Gd0.25Mn0.75O3, focussing on phase change and doping effects. X-ray diffraction (XRD) investigation indicates the development of a polycrystalline compound with an orthorhombic structure (space group Pbnm), which is corroborated using Rietveld refinement. The calculated tolerance factor (t = 0.7467) aligns with the perovskite structure. Dielectric measurements reveal a frequency-dependent negative dielectric constant (NDC) at low frequencies, which becomes prominent at elevated temperatures (~ 350 °C), consistent with Drude theory and space charge polarization effects. The AC conductivity, as determined by Jonscher’s Universal Power Law, displays frequency and temperature dependency, which is linked to hopping conduction processes. Impedance spectroscopy indicates NTCR behaviour and grain boundary contributions, supported by Cole-Cole plots and equivalent circuit modelling. Electric modulus analysis shows temperature-induced transitions between capacitive and inductive responses, confirming dielectric anomalies. The thermistor response demonstrates strong NTC behaviour with calculated activation energy and TCR values. These findings highlight the role of doping and structural modifications in tuning the multifunctional properties of La0.665Bi0.33Ba0.005Gd0.25Mn0.75O3 for advanced electronic applications.