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<p>The practical limitation of using rhombohedral-structured hematite (α-Fe<sub>2</sub>O<sub>3</sub>) system in semiconductor industry is its poor electrical conductivity (~ 10<sup>–11</sup> S/m). On the other hand, hematite is a potential candidate for solar cell and hydrogen storage applications. This stimulates a worldwide interest for enhancing electrical conductivity in hematite based materials. The co-doping of divalent Co and tetravalent Ti ions in the hematite structure has remarkably enhanced electrical conductivity up to the order of 10<sup>–2</sup> S/m and promised a wide scope of electronic applications of the materials. The variation of co-doping content (<i>x</i>) and heat treatment environment under air and vacuum played a crucial role for enhancement of electrical conductivity. The material of composition α-Fe<sub>2−<i>x</i></sub>Ti<sub><i>x</i>/2</sub>Co<sub><i>x</i>/2</sub>O<sub>3</sub> with <i>x</i> = 0.2, 0.4 and 0.6 has been stabilized in rhombohedral phase by mechanical alloying and post heat treatment at 1000&#xa0;°C. The current–voltage characteristics of the samples have been measured in the temperature range of 313–723&#xa0;K. This work has studied the mechanisms of temperature- and applied voltage- dependent electrical properties in Co and Ti co-doped α-Fe<sub>2</sub>O<sub>3</sub> system. The experimental results of tuning electrical conductivity and electro-resistance can be useful for applications of hematite based metal oxides in modern spintronic devices, gas sensors, memory devices and thermoelectric devices.</p>

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Study of temperature dependence electrical properties and conduction mechanisms of Co and Ti co-doped hematite (α-Fe2O3) system

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Vimal Narayan Sahoo,
  • R. N. Bhowmik

摘要

The practical limitation of using rhombohedral-structured hematite (α-Fe2O3) system in semiconductor industry is its poor electrical conductivity (~ 10–11 S/m). On the other hand, hematite is a potential candidate for solar cell and hydrogen storage applications. This stimulates a worldwide interest for enhancing electrical conductivity in hematite based materials. The co-doping of divalent Co and tetravalent Ti ions in the hematite structure has remarkably enhanced electrical conductivity up to the order of 10–2 S/m and promised a wide scope of electronic applications of the materials. The variation of co-doping content (x) and heat treatment environment under air and vacuum played a crucial role for enhancement of electrical conductivity. The material of composition α-Fe2−xTix/2Cox/2O3 with x = 0.2, 0.4 and 0.6 has been stabilized in rhombohedral phase by mechanical alloying and post heat treatment at 1000 °C. The current–voltage characteristics of the samples have been measured in the temperature range of 313–723 K. This work has studied the mechanisms of temperature- and applied voltage- dependent electrical properties in Co and Ti co-doped α-Fe2O3 system. The experimental results of tuning electrical conductivity and electro-resistance can be useful for applications of hematite based metal oxides in modern spintronic devices, gas sensors, memory devices and thermoelectric devices.